Shared Wells and Water Supply Corporations in the Texas Hill Country

This article provides general educational information about shared wells and Water Supply Corporations in the Texas Hill Country. It is not legal, engineering, or water-resource advice. Well performance, water availability, WSC governance, regulatory requirements, and shared agreement terms vary by property, county, and service area. Consult qualified professionals for guidance specific to your situation.

1. Introduction: The water question nobody asks until it is too late

Price, acreage and commute time are the usual starting points when buyers evaluate a rural Hill Country property. Water source is less visible but no less important. In Kendall, Bexar and Comal Counties, the water arrangement, whether a private well, a shared well, a Water Supply Corporation or a retail utility, determines daily livability, monthly costs, long-term maintenance obligations and, in some cases, the legal relationship between neighbors.

Most buyers understand the difference between a house on utility water and a house with its own private well. The less understood arrangements are private shared wells and Water Supply Corporations, but those two systems should not be treated as variations of the same thing. A private shared well is primarily a real-property, contract, easement and infrastructure arrangement among a limited number of users. A Water Supply Corporation is a nonprofit retail water utility organized under Chapter 67 of the Texas Water Code and ordinarily operates a metered distribution system subject to public-water-system requirements. The documents, regulatory oversight, financing questions and operational risks are different.

This article covers how shared wells and WSCs actually operate, what the agreements do and do not cover, and what buyers should investigate before signing when feasible and otherwise verify before the negotiated option, title-objection, financing and other due-diligence deadlines expire.

2. Four common water arrangements in the Hill Country

Water service in the Hill Country does not fit neatly into three categories. Buyers commonly encounter at least four arrangements:

Individual private well. One property is served by a well and associated equipment dedicated to that property. The owner is responsible for the well, pump, pressure equipment, treatment, electricity, testing and private piping. Local groundwater-district or Edwards Aquifer Authority requirements may still apply.

Private shared well. One well supplies two or more properties under a private agreement, easements or another ownership arrangement. The agreement should address ownership, permitted uses, system capacity, access, testing, maintenance, expenses, emergencies, future connections and transfer to later owners.

Water Supply Corporation. A WSC is a nonprofit water utility organized under Chapter 67 of the Texas Water Code. It commonly owns or controls the source, treatment, storage, meters and distribution system and provides service under its tariff, bylaws and service rules. The customer ordinarily owns and maintains the private plumbing or service line on the customer's side of the meter, subject to the WSC's tariff.

Other retail utility service. A property may receive water from a city, municipal utility district, special utility district, investor-owned utility or another certificated provider. Ownership, rates, service obligations, connection costs and regulatory oversight depend on the type of provider. This arrangement generally shifts source, treatment and distribution responsibilities to the utility, although the customer remains responsible for private plumbing and other items assigned by the provider's rules.

A WSC is therefore not simply a larger shared well, and 'municipal water' is not an adequate label for every non-well utility arrangement.

For properties in the Edwards Aquifer region, the regulatory framework adds another layer. The Edwards Aquifer Authority (EAA) regulates groundwater production from the Edwards formation, and wells that withdraw from the Edwards Aquifer within the EAA's jurisdiction may have additional permitting requirements [18]. The Edwards Aquifer fundamentals guide covers the regulatory landscape in more detail.

3. What a shared well actually is

A shared well is a single water well that serves two or more properties. The well may be located on one tract while other tracts receive a contractual right to receive water and recorded easements for access, service lines, electrical facilities, inspection, maintenance, repair and replacement. Do not assume that an access or utility easement conveys ownership of groundwater, the well or other system equipment. Groundwater ownership, ownership of the physical system and the contractual right to receive water are separate issues.

Shared wells can be found in older subdivisions, rural tracts and multi-lot developments throughout the Hill Country. The reasons for a particular arrangement vary, and the existence or terms of a shared well should not be inferred from lot size or subdivision age. The recorded agreement, title records, plat, survey and physical system are more reliable than generalized assumptions.

Water-well drilling and pump installation are regulated through the Texas Department of Licensing and Regulation [10]. Licensed drillers submit required well or plugging reports through the Texas Well Report Submission and Retrieval System, a cooperative TDLR–TWDB system. The information then populates the TWDB Submitted Drillers Report database [8]. Older reports may instead be found through TCEQ records [9]. A driller's report documents conditions and estimates at completion; it is not proof of current yield, present water quality, legal access, compliance with every local rule or future performance.

A private-looking shared system can also cross into public-water-system regulation. A system that supplies water for human consumption and regularly serves at least 25 individuals daily at least 60 days out of the year is a public water system under TCEQ rules (30 TAC §290.38) [5]. Such a system has drinking-water, operating, monitoring and reporting obligations beyond those applicable to an ordinary private residential well. Buyers should verify the number of connections and people served rather than relying on the name used by the seller or listing.

For a deeper look at how to read a well log and what the data points mean, see the article on the truth about well logs.

4. What a shared well agreement should cover

A well-drafted shared well agreement is ordinarily written, properly executed and recorded in the county's real-property records. Texas Property Code Section 13.001 does not make every unrecorded agreement invalid between the original parties. Instead, an unrecorded real-property interest may be ineffective against a later purchaser who pays value and takes without notice. Proper recording generally supplies constructive notice, but recording alone does not guarantee that every promise in the document is enforceable against successors. The agreement must be drafted to address successors and assigns, transfer, easement and infrastructure rights, and the specific affected tracts.

A complete shared well agreement should address the following elements:

Ownership and legal rights. Identify who owns the groundwater rights, well bore, pump, pressure equipment, storage, treatment equipment, electrical service, controls and distribution lines. Physical location on one tract does not answer every ownership question.

Properties and permitted users. Identify every benefited and burdened tract by legal description. State whether service is limited to one dwelling per tract and whether guest houses, accessory dwelling units, short-term rentals, commercial uses, livestock, pools and irrigation are permitted.

Capacity and allocations. State whether users receive a maximum volume, reserved capacity or only a nonexclusive right to reasonable domestic use. The agreement should avoid guaranteeing that groundwater conditions or production will remain unchanged forever.

Metering and usage records. State whether connections are individually metered, who owns the meters, who reads them and how leaks or excessive use are identified.

Operating authority. Identify the system operator and who can call contractors, approve routine work, respond to emergencies, shut down equipment or issue conservation instructions.

Electricity and backup power. Identify whose electric meter supplies the system, how electricity is allocated, what happens if that account becomes delinquent and whether the system has a generator, transfer equipment or usable emergency storage.

Testing and treatment. Assign responsibility for sampling, laboratory selection, treatment, disinfection after repairs, delivery of results and response to contamination. Identify whether testing occurs at the source, after treatment and at representative homes.

Expenses and reserves. Separate routine electricity, inspections, testing, ordinary maintenance, line repairs, emergency work, pump or tank replacement, treatment upgrades, replacement-well costs and system expansion. State whether a reserve fund or special assessment can be used.

Nonpayment and enforcement. Establish billing, notice, cure periods, reimbursement rights, interest or other remedies, subject to legal review. Do not leave users to negotiate payment after the water has stopped.

Emergency work. Authorize a designated person to protect or restore the system without waiting for unanimous approval, while requiring prompt notice and documentation of the expense.

Easements. Include accurately described easements for the well site, access, buried water lines, electrical lines, tanks, treatment equipment, inspection, repair and replacement. Consider whether a legally usable replacement-well site and access route exist.

Insurance and liability. Address casualty damage, liability, insurance on shared equipment and responsibility for damage caused by leaks, contamination, negligent operation or contractor access.

Drought and shortage procedures. State how conservation stages are triggered, which uses are curtailed first and whether irrigation, pool filling, livestock or additional structures receive lower priority than household use.

New connections and modifications. State whether another tract, dwelling or structure may be connected and what engineering review, consent, capacity charge or amendment is required.

Transfer, financing and successors. Address automatic transfer with each benefited tract, lender requirements, estoppel or status certificates, outstanding balances and delivery of records to future owners.

Failure, replacement and termination. Address interim water, replacement-well decisions, abandonment, conversion to utility service, disconnection and allocation of remaining equipment or reserves.

Amendments and disputes. Specify how amendments are approved and recorded and establish notice, meeting, mediation, arbitration or litigation procedures as appropriate.

When a buyer is considering a property served by a shared well, obtain every available recorded and unrecorded agreement, amendment and easement and review them with a Texas real estate attorney as early as practical. If no recorded agreement exists, that is a material finding that should be addressed before the applicable option, title-objection, financing and other due-diligence deadlines not merely before closing [1][22].

5. Water Supply Corporations: what they are and how they work

A Water Supply Corporation is a nonprofit water supply or sewer service corporation organized and operating under Chapter 67 of the Texas Water Code [4]. A WSC commonly provides retail water under a tariff and service rules and may hold a Certificate of Convenience and Necessity covering an identified service area. A CCN identifies the provider authorized to serve an area, but a line on a map or near a tract should not be treated as proof that a particular property has an active meter, immediately available capacity or service without line-extension costs.

A WSC is governed by a Board of Directors elected by its members (shareholders/property owners) in accordance with Chapter 67 and its governing documents. The board sets rates and policies subject to applicable law. Under the PUCT rate-appeal process, 10 percent (or 10,000, whichever is less) of the affected ratepayers whose rates changed generally must petition within 90 days after the effective date of the change [12]. Other service, billing or penalty disputes may involve the WSC tariff, PUCT rules, the Texas Water Code and other applicable law.

A WSC that meets the public-water-system definition must comply with TCEQ drinking-water requirements. That places it under the same public-health standards that apply to other public water systems, but it does not mean every WSC has water identical in taste, hardness, reliability or compliance history to every retail utility. Buyers should review the current Consumer Confidence Report and the system's analytical results, violations and compliance history in TCEQ's Drinking Water Viewer [6].

If a WSC produces groundwater, its wells may also be subject to the applicable groundwater district or the Edwards Aquifer Authority. Do not use a single statewide spacing rule as a substitute for local research. In Kendall County, for example, the applicable entity is the Cow Creek Groundwater Conservation District [17], whose rules distinguish among well categories, tract and platting circumstances and production limits. Buyers should review the district's current rules for the specific property rather than relying on a generalized 'one well per six acres' statement.

6. Capacity is a system question, not a single GPM number

Several different measurements are often collapsed into the phrase 'well flow rate': the well's sustainable yield or recovery rate, the pump's capacity, the amount of usable storage, pressure within the system and the delivery rate available at a fixture. They are related, but they are not interchangeable.

A driller's report may show an estimated yield when the well was completed. A current sustained-yield or pump test can provide more useful present-day information, but it still reflects conditions during the test. Test duration, static water level, pumping water level, drawdown, recovery and seasonal or drought conditions all matter.

Do not divide the well's reported GPM by the number of homes and call the result each home's allocation. A 20-GPM well serving four homes does not automatically provide '5 GPM per home.' Household demand is intermittent, and storage tanks, pump controls, pipe sizes, elevation and simultaneous use determine what users experience. A lower-yield well with properly designed atmospheric storage can serve peak hourly demand that exceeds the well's instantaneous yield. However, the well's long-term sustainable yield must still exceed the combined average daily demand of all connected properties. An inadequately designed system can perform poorly despite a favorable number on the original well report.

For a private shared well, the buyer should use one or more appropriately qualified Texas professionals. Depending on the work required, that may include a TDLR-licensed water well driller, a TDLR-licensed pump installer and, when system design or capacity analysis warrants it, a Texas-licensed professional engineer with appropriate water-system experience. The evaluation should address current sustained yield, pump and control equipment, pressure and storage tanks, pipe sizes, elevation changes, number of connections, peak simultaneous demand, treatment equipment and available information about drought performance [20][21].

For a WSC or other public water system, the buyer generally should not attempt to divide the source wells' combined GPM among customers. Instead, verify the meter and service-line size, normal pressure at the property, service history, storage, backup sources, emergency power and any known low-pressure areas. TCEQ requires public water systems to maintain at least 35 psi throughout the distribution system under normal operating conditions under 30 TAC §290.46(r) [7]. That public-system benchmark should not be treated as a guarantee of pressure or flow at a particular private shared-well fixture.

Delivered household flow depends on the complete system; no single GPM figure determines performance.

7. Shared infrastructure liabilities and maintenance responsibilities

Shared-well disputes often involve both cost allocation and water use. When a pump, pressure tank, control system, buried line or treatment component fails, the immediate question is who can authorize the work, advance the money and collect the other users' shares. If the shared well agreement does not specify a clear cost-sharing mechanism, the parties must negotiate a solution in the middle of a functional emergency, which is the worst time to negotiate.

Maintenance responsibilities for a shared well system include:

Routine maintenance. The pump, pressure tank, control box and electrical connections need periodic inspection and maintenance. For an unregulated private well, EPA recommends annual testing for total coliform bacteria, nitrates, total dissolved solids and pH, with additional testing based on local conditions and suspected contaminants. EPA also recommends immediate testing after significant changes near the well, including flooding, land disturbance or nearby construction; after replacement or repair of any part of the well system; and when the water's odor, color or taste changes. Illness or a known local contamination problem may justify additional analytes or more frequent testing. Use a laboratory qualified for drinking-water analysis and follow its sampling, container, preservation and delivery instructions. For a shared system, the sampling plan should identify appropriate locations, which may include the source, water after treatment and representative home taps. Inspect the wellhead and surrounding area for damage, cracks, leaks, ponding and pathways for surface-water intrusion, particularly after flooding or major storms [16].

Major repairs. Pump replacement, well casing repair, and electrical system replacement are the major cost events. Repair and replacement costs vary substantially with well depth, casing, pump size, access, electrical work, storage, treatment, trenching, permitting and local geology. A quoted 'well price' may exclude the pump, controls, tanks, treatment, electrical work, distribution lines, testing, plugging of the failed well or site restoration. Buyers should obtain current written local estimates with the scope and exclusions clearly stated instead of relying on a generic statewide range.

Drought-related costs. During an extended drought, groundwater levels and the well's static water level may decline, and the pumping water level under demand may fall below the pump intake. Possible responses depend on the existing well depth, casing, completion, aquifer conditions and applicable regulatory requirements. A qualified licensed professional should determine whether the pump can safely be lowered, whether the existing well can be rehabilitated or modified, whether a replacement well is feasible, or whether storage, conservation or an approved supplemental supply is needed. None of these options guarantees restored production. The agreement should address shortage procedures, emergency storage or delivery, professional evaluation and allocation of drought-related costs.

For a property served by a WSC, the division of maintenance responsibility is controlled by the WSC's tariff, service rules and the location of the meter or other defined service boundary. The WSC typically maintains specified source, treatment, storage and distribution facilities on its side of that boundary. The customer or member may be responsible for the private service line, plumbing, leaks, backflow equipment or other customer-side facilities identified in the tariff. Rates help fund system operations and capital needs, but customers may also face connection charges, capital contributions, special fees, drought surcharges or other tariff-authorized charges. Confirm the exact ownership and maintenance boundary instead of assuming that every line from the meter to the house is governed the same way.

8. What happens when a neighbor over-pumps

Excessive use is a genuine concern, but the mechanical description matters. A typical shared well has one pump intake serving the connected properties. Heavy simultaneous demand can exhaust usable storage, reduce shared pressure and cause excessive drawdown. If the pumping water level falls below the pump intake or a low-water cutoff activates, every connected user may lose service until the well recovers or the system is reset. Because the connected properties ordinarily share one well and pump, the system does not have a separate pump intake for each property. Heavy use by one participant can nevertheless reduce available storage, lower system pressure or contribute to the pumping water level falling below the shared pump intake.

Over-pumping scenarios typically fall into a few categories:

Irrigation overuse. A property owner who runs large-scale landscape irrigation, fills a swimming pool, or waters livestock from a shared well can consume a disproportionate share of the well's capacity. The remaining users experience pressure drops or complete loss of water until the well recovers.

Leaks. An undetected leak in one household's plumbing can consume a substantial volume of water and reduce service available to every user. Depending on the system design, the leak can exhaust usable storage, cause the pump to run or cycle excessively, increase electricity costs and contribute to low pressure or loss of service. Individual metering, leak-detection procedures and a clear responsibility for prompt repairs can reduce this risk.

Unauthorized expansion. A property owner who connects a guest house, workshop, or accessory dwelling unit to the shared well without the other users' knowledge or consent increases the demand on the system without a corresponding adjustment in the cost-sharing arrangement.

The contractual and legal response to excessive use depends on the agreement, the governing property rights and the facts of the dispute. A well-drafted agreement may provide notice and cure procedures, conservation measures, reimbursement rights, limits on particular uses, mediation or other enforcement mechanisms. A violation does not automatically entitle another user to a particular remedy, and the absence of an express usage limit does not necessarily require a court to allocate 'equitable rights.' The affected parties should review the agreement and title documents with a Texas real estate attorney before taking enforcement or self-help action.

Individual metering does not eliminate WSC capacity risk. Metering measures use and may support tiered rates, drought surcharges or enforcement, but total demand can still strain source capacity, treatment, storage or distribution infrastructure. Buyers should review the WSC's drought-contingency plan, current restrictions, historical outages, low-pressure events and boil-water notices.

9. How to evaluate a shared well agreement before closing

For a buyer considering a property served by a shared well, the due diligence process should include the following steps:

Step 1: Obtain every agreement and recorded instrument. Request all recorded and unrecorded shared-well agreements, amendments, easements, assignments, notices and related documents from the seller and title company. Confirm what appears in the county's real-property records and title commitment. The absence of a recorded agreement is a material title and successor-enforcement risk, but Texas Property Code Section 13.001 does not automatically invalidate every unrecorded agreement between the original parties. Its effect on a purchaser can depend on execution, notice, the nature of the rights and other facts that should be evaluated by a Texas real estate attorney [1].

Step 2: Review the agreement with an attorney. Have a real estate attorney review the agreement to identify any gaps, ambiguities, or unfavorable terms. The cost of a legal review is small compared to the cost of a shared well dispute.

Step 3: Verify present performance and condition. Locate the driller's report, but do not treat its completion-date yield as a current guarantee. Hire an appropriately qualified Texas well contractor to evaluate static water level, pumping water level, drawdown, recovery, sustained yield, pump condition, storage, pressure, controls, visible sanitary defects and delivery at the benefited property. Obtain laboratory water testing acceptable to the buyer's lender and appropriate for the aquifer and property. A brief faucet-flow check is not a substitute for a meaningful system evaluation.

Step 4: Talk to the other users. Speak with the other property owners who share the well. Ask about their experience with water pressure, frequency of maintenance issues, how costs have been divided historically, and whether there have been any disputes.

Step 5: Check the title, deed, easement and plat records. Review the title commitment, recorded deeds, easements, plats and relevant county real-property records. Do not assume that a well or access easement will appear on the subdivision plat. Confirm that every required well-site, access, water-line and electrical easement is recorded, applies to the correct benefited and burdened tracts and describes a usable location or route. Compare the recorded documents with the current survey and physical improvements.

Step 6: Trace the physical system and compare it with the legal documents. Have the survey and inspection identify the well, well house, tanks, treatment equipment, electrical supply, meters, visible service lines and access route. Review the title commitment, particularly Schedule B, and the recorded documents for the well-site, access, water-line and electrical easements. Determine whether fences, buildings, driveways or landscaping obstruct access or lie over a line.

Also identify nearby septic tanks, drain fields, aerobic spray areas, fuel tanks, livestock areas, drainage paths and other potential contamination sources on every affected tract. A compliant separation at the well site can be undermined by unrecorded lines or later improvements on a neighboring property.

Step 7: Clarify the cost-sharing mechanism. Confirm that the agreement specifies how costs are divided for electricity, routine maintenance, major repairs, and well replacement. If the agreement uses a vague formula like "shared equally," clarify whether that means equal dollars per household or equal shares based on usage.

Financing can fail even when the water system works

A shared well can create a collateral-eligibility problem if the lender is consulted too late. Loan programs and individual lender overlays differ. They may require a binding and recorded agreement, enforceable access, defined maintenance and cost obligations, acceptable water testing and evidence that the system serves no more properties than the program permits. FHA, for example, defines a shared well as one serving two to four homes under a binding agreement that meets FHA requirements [19].

The buyer should send the complete agreement, well information and water test to the lender early enough to resolve concerns before the option or financing deadlines expire. A cash purchase avoids the immediate underwriting review but does not eliminate future resale and refinancing risk.

10. Questions to ask a WSC before signing a contract

For a buyer considering a property served by a WSC, the due diligence questions are different but equally important:

Identify the provider correctly. Obtain the WSC's exact legal name, its PUCT Certificate of Convenience and Necessity number if it holds a CCN [13], and its TCEQ public-water-system identification number. If no CCN number is provided, obtain written confirmation of the provider's regulatory status rather than assuming that the absence of a number is an error or that a nearby service-area boundary guarantees service.

Is there an active meter and transferable membership? Confirm the meter number, current account status, membership certificate or service interest, transfer documents, unpaid balances and any inspection required before transfer.

If there is no active meter, will the WSC serve this tract? Obtain a written service-availability or will-serve statement. Do not infer service from a nearby water line, a CCN map, a subdivision plat or a listing description. Ask about capacity, line-extension requirements, engineering, road crossings, easements, deposits, membership fees, tap charges, capital contributions and the expiration date of any quote.

What does the tariff require? Obtain the current tariff, rate schedule and service rules. Review minimum charges, usage tiers, drought surcharges, late fees, reconnection charges, leak-adjustment rules, meter-size charges and responsibility for the service line.

What caused prior rate changes? Review the reasons for rate changes. Increases can result from wholesale water, power, treatment, debt service, regulation, capital projects or financial weakness; the increase alone does not identify the cause.

What is the source and what backup exists? Determine whether the WSC uses its own groundwater, purchased water, surface water or a combination. Ask about storage, interconnections, emergency wells, backup power and dependence on a single source or wholesale supplier.

What restrictions apply during drought? Request the drought-contingency plan, current stage, watering schedule, surcharges, penalties and history of mandatory restrictions.

What is the service history at this specific location? Ask about low pressure, outages, line breaks, boil-water notices and customer complaints in the immediate pressure plane or distribution area, not only systemwide averages.

What does TCEQ show? Review the latest Consumer Confidence Report and search TCEQ's Drinking Water Viewer for analytical results, violations, monitoring status and enforcement history. A seller's clean-looking glass of water is not a compliance review.

What is the WSC's financial and capital condition? Request the latest available audit or financial statements, budget, debt information, board minutes and capital-improvement plan. Look for deferred projects, capacity constraints and major planned expenditures.

Does the system provide fire flow? Do not assume that a nearby hydrant or water main provides the pressure, volume or classification needed for structural firefighting. Verify fire-flow capability with the provider and local fire authority and discuss the result with the buyer's insurance professional.

11. Legal remedies and dispute resolution

When a shared well arrangement breaks down, the legal options depend on the terms of the agreement and the nature of the dispute. The most common legal issues include:

Contract and payment disputes. A missed payment or alleged usage violation does not automatically establish entitlement to damages or an injunction. The agreement's payment formula, notice and cure requirements, enforcement provisions, defenses and the available evidence all matter. A Texas real estate attorney should determine which contractual or other remedies may be available.

Access and easement disputes. A recorded easement can provide important notice and evidence of access rights, but recording alone does not make every claimed use, route or obligation enforceable. The document's wording, legal description, scope, purpose and relationship to the shared-well agreement must be analyzed. Depending on the facts, counsel may evaluate declaratory, injunctive, contractual or other relief. Parties should not use self-help measures that could damage property or interrupt residential water without legal advice.

Missing or incomplete instruments. When no written shared-well agreement exists, do not assume that an easement by necessity, prescription or another equitable doctrine will supply the full access, infrastructure and continuing water-service rights the users need. Those doctrines have specific, fact-intensive legal requirements. Counsel should evaluate any express, implied, prescriptive, necessity-based or equitable claim based on the property history and applicable Texas law.

Ratepayers may appeal certain WSC rate changes through the PUCT process. For most such appeals, PUCT must receive petitions from at least 10 percent (or 10,000, whichever is less) of the affected ratepayers within 90 days after the rate change's effective date [12]. Different procedures and deadlines may apply to service, billing, disconnection and water-conservation-penalty disputes. Depending on the issue, a member's rights and available procedures may arise under the WSC's bylaws and tariff, Chapter 22 of the Texas Business Organizations Code, Chapter 67 of the Texas Water Code, PUCT rules and other applicable law. Affected customers should obtain advice about the particular dispute rather than assuming that the rate-appeal process applies to every complaint.

The cost of litigation can quickly exceed the value of the immediate dispute. Mediation may be practical when the parties must continue cooperating. Arbitration generally requires an enforceable arbitration agreement, whether in the original shared-well agreement or a later agreement; a court may compel arbitration when such an agreement applies. The appropriate procedure and any applicable deadlines should be confirmed before action is taken.

12. Comparison table: Private Well vs. Shared Well vs. WSC vs. Retail Utility

13. Buyer's checklist for shared-water properties

Before closing on a property served by a shared well or WSC, a buyer should complete the following due diligence items:

A rainwater-harvesting system can reduce irrigation demand or provide supplemental storage, but its value depends on catchment area, storage volume, rainfall, treatment, intended use and maintenance. A potable rainwater system requires substantially more evaluation than an irrigation tank. If rainwater or a private well shares plumbing with WSC or other public water service, verify the provider's tariff, plumbing requirements and backflow or air-gap protections [7]. An unauthorized cross-connection can threaten the public system and violate service rules.

For a broader overview of the infrastructure realities that out-of-state buyers often overlook, see the guide to three things out-of-state buyers get wrong about Hill Country acreage.

14. Frequently asked questions

Does a shared well mean I do not own my water supply?

Separate three issues: ownership of groundwater rights, ownership of the physical system and the contractual right to receive water. Texas Water Code Section 36.002 recognizes a landowner's ownership of groundwater beneath the land as real property [2], but those rights can be affected by conveyances, reservations, leases and regulation. A user receiving water from a well on another tract may own none of that well's equipment and may have only the rights granted by the agreement. Pumps, tanks, controls, treatment equipment and private service lines may be individually or jointly owned. Review the agreement, title records, TREC water disclosure and physical system rather than assuming ownership from location.

Can a shared well run out of water?

A shared-well property can lose water service for several different reasons. The pumping water level may fall below the pump intake, the well's recovery rate may be insufficient to meet combined demand, usable storage may be exhausted, or the pump, controls, pressure equipment or electrical supply may fail. Equipment failure is not the same as the well running out of groundwater, even though the immediate result at the faucets may be the same. During drought conditions, shared wells can be especially vulnerable because the combined demand of multiple households can exceed the well's sustainable yield. A driller's report and a properly designed current pump or sustained-yield test can provide useful observations about the conditions measured, but neither establishes a permanent capacity or guarantees future performance. Usable system capacity also depends on drawdown, recovery, storage, pump and controls, simultaneous demand, elevation, piping and seasonal groundwater conditions [8][20][21].

Do I need a well permit for a shared well?

Not necessarily, and the terms 'permit,' 'registration' and 'driller's report' should not be used interchangeably. Texas Water Code Section 36.117 generally requires a groundwater conservation district to exempt a well from its permit requirement when the well is used solely for domestic use or for providing water for livestock or poultry, is located or proposed to be located on a tract more than 10 acres, and is drilled, completed or equipped so that it is incapable of producing more than 25,000 gallons per day. The statute explicitly says 'more than 10 acres,' meaning exactly 10 acres does not qualify for this specific automatic statutory protection. The exemption does not apply to a well used to supply water for a subdivision of land for which plat approval was required under the applicable subdivision statute [3].

Even when a well is exempt from a production permit, registration, spacing, construction, pollution-prevention and reporting requirements may still apply. A shared use, additional structure, subdivision, commercial use or change in production can alter the analysis. In Kendall County, consult the Cow Creek Groundwater Conservation District [17]. In Bexar County, EAA jurisdiction is aquifer- and location-specific: the Authority regulates withdrawals from the Edwards Aquifer within its jurisdiction, not withdrawals from every aquifer or operation of every water well in the county [18]. Confirm the property, aquifer, well use and current rules with the actual regulator before relying on an exemption.

What happens if a shared well fails and needs to be replaced?

The shared well agreement should specify how the cost of a new well is divided among the users. If the agreement is silent, the parties may face an emergency negotiation or legal dispute over authority, access and cost allocation at the worst possible time. Do not assume that replacement costs will automatically be divided equally. For a four-home shared well, the cost per household depends on the well depth, pump, equipment access and geology at the time of failure. Buyers should obtain current written local estimates rather than relying on a generic statewide range.

Can I install a rainwater harvesting system as a backup to a shared well?

Generally, yes, subject to physical feasibility, the shared-well agreement, deed restrictions and applicable building, plumbing and public-water-provider requirements. A properly sized and maintained rainwater system can reduce irrigation demand or provide supplemental storage, but its usefulness depends on catchment area, storage volume, rainfall, intended use, treatment and maintenance. A potable system requires additional design, treatment, testing and operational safeguards. Do not directly interconnect rainwater equipment with WSC or other public-water plumbing unless the provider's tariff and applicable plumbing and backflow requirements are satisfied. The rainwater harvesting guide discusses system sizing, costs and Texas considerations in more detail.

Does a WSC membership affect my property value?

The market effect is property-specific. An active, reliable WSC connection can be easier for many buyers and lenders to evaluate than an informal shared well, but high connection costs, poor service history, capacity limits, compliance problems, drought restrictions or large planned rate increases can have the opposite effect. The relevant comparison is the property's actual service and cost profile against competing properties in the same market.

Can I drill my own well if I buy a property on a shared well?

Whether a new private well can be drilled depends on the property's location, tract and platting history, proposed use, groundwater rights, deed restrictions and the current rules of the applicable groundwater regulator. In Kendall County, the Cow Creek Groundwater Conservation District should be asked to identify the well category and current requirements for the specific tract. A well may qualify for the statutory exemption in Texas Water Code Section 36.117 if it is used solely for domestic use or for providing water for livestock or poultry, is on a tract more than 10 acres and is drilled, completed or equipped so that it is incapable of producing more than 25,000 gallons per day; however, the subdivision limitation and applicable registration, spacing, construction and reporting requirements must still be evaluated [3][17]. On smaller lots, the GCD may require a permit or may not allow a new well if the lot is too small to meet spacing requirements. A property with a shared well may have a deed restriction that prohibits drilling a separate well, so the deed restrictions should be reviewed as well. Also verify whether groundwater rights were reserved, severed or leased; whether the property lies in a utility CCN; whether the utility tariff limits private wells; and whether deed restrictions prohibit drilling. A private well must not be cross-connected improperly with a public water supply.

How do I verify the water quality of a shared well or WSC?

For a private shared well that is not regulated as a public water system, the agreement should assign responsibility for sampling, payment, delivery of results and response to contamination. EPA recommends annual baseline testing for total coliform bacteria, nitrates, total dissolved solids and pH, plus additional testing based on local risks and after flooding, system repairs or changes in odor, color or taste [16]. TCEQ recommends using an accredited drinking-water laboratory; contact the laboratory before sampling to confirm that it performs the requested analyses and to obtain the correct containers and handling instructions [6].

For a residential WSC operating as a community public water system, review its annual Consumer Confidence Report and its record in TCEQ's Drinking Water Viewer. Community public water systems must generate a CCR and make it available to customers by July 1 each year. The report describes the source water, detected contaminants, compliance information and other required material [6].

Can the shared well agreement be changed after I buy?

The amendment process depends on the wording of the agreement, the nature of the rights being changed and applicable Texas property and contract law. Do not assume that every amendment requires unanimity or that a majority-vote clause necessarily permits a majority to alter every easement, ownership interest or appurtenant property right. Review the amendment, voting, successor and recording provisions with a Texas real estate attorney. Any amendment affecting recorded property rights should be properly executed, acknowledged and recorded when appropriate.

Is a shared well disclosure required in a Texas real estate transaction?

TREC Form 58-0 is not a universal statute that independently requires every Texas seller to provide a shared-well disclosure. Effective July 1, 2026, revised TREC contract forms include a Seller's Water Disclosure provision that uses Form 58-0 and requires the parties to identify whether the form was delivered, will be delivered within the stated contractual period or is not required under the conditions listed in the contract. The obligation therefore depends on the transaction and the executed contract form and selections [14]. Form 58-0 asks about wells on the property, their owners or operators and beneficiaries, governing agreements or understandings, water received from a well on another property, groundwater rights and certain surface-water matters.

Texas Property Code Section 5.008 separately requires a Seller's Disclosure Notice in many one-dwelling residential transfers and includes water-supply and known groundwater-district information, subject to statutory exemptions. House Bill 1221 added the known groundwater- or subsidence-district disclosure effective January 1, 2016; it did not create the 2026 TREC water-rights form [15]. Known shared-well arrangements, recorded documents and known system problems should be disclosed accurately, with legal advice when needed.

What happens if the well owner sells their property and the new owner does not want to continue the shared well agreement?

A properly drafted and recorded agreement may bind a later purchaser, but recording alone does not cure defective drafting or automatically make every obligation run with the land [1][22]. The agreement's legal descriptions, easements, successor-and-assign provisions, transfer terms and nature of the obligations all matter. The buyer, title company and a Texas real estate attorney should confirm how the agreement affects the property and appears in the title commitment before closing.

15. Sources

1. Texas Property Code Section 13.001 — validity and effect of unrecorded real-property instruments. statutes.capitol.texas.gov
2. Texas Water Code Section 36.002 — ownership of groundwater. statutes.capitol.texas.gov
3. Texas Water Code Section 36.117 — groundwater-district permit exemptions, registration, spacing and subdivision limitation. statutes.capitol.texas.gov
4. Texas Water Code Chapter 67 — nonprofit Water Supply Corporations. statutes.capitol.texas.gov
5. TCEQ — determining whether a private well or water supply is a public water system. tceq.texas.gov
6. TCEQ — Drinking Water Viewer, Consumer Confidence Reports, private-well testing information and accredited drinking-water laboratories. tceq.texas.gov
7. TCEQ — Rules and Regulations for Public Water Systems, including 30 TAC Chapter 290, Subchapter D. tceq.texas.gov
8. Texas Water Development Board — Submitted Drillers Reports database. twdb.texas.gov
9. Texas Water Development Board — instructions for locating a water-well report. twdb.texas.gov
10. Texas Department of Licensing and Regulation — Water Well Drillers and Pump Installers. tdlr.texas.gov
11. Public Utility Commission of Texas — Water Supply Corporation consumer information. puc.texas.gov
12. Public Utility Commission of Texas — rate appeals. puc.texas.gov
13. Public Utility Commission of Texas — Certificates of Convenience and Necessity. puc.texas.gov
14. TREC Form 58-0 — Seller's Disclosure About Groundwater and Surface Water Rights. trec.texas.gov
15. Texas House Bill 1221, 2015 — enrolled text and January 1, 2016 effective date. capitol.texas.gov
16. EPA — recommended private-well testing. epa.gov
17. Cow Creek Groundwater Conservation District — current rules. ccgcd.org
18. Edwards Aquifer Authority — jurisdiction and groundwater management. edwardsaquifer.org
19. HUD — current FHA Single Family Housing Policy Handbook 4000.1. hud.gov
20. Water Systems Council — well inspection, yield and capacity guidance. watersystemscouncil.org
21. Water Systems Council — pump sizing and peak demand. watersystemscouncil.org
22. Secondary Texas attorney commentary — shared-well agreement drafting. sanantoniorealestatelawyer.com; daughtreylaw.com

Last verified: July 29, 2026. Shared well agreements, WSC rate structures, and regulatory requirements are subject to change. Buyers should confirm current requirements with the applicable Groundwater Conservation District, the TCEQ, the PUCT, and a qualified real estate attorney before relying on any information in this article.