Rural Home Compass

Texas homeowner guide · Private well water

When should you test a private well in Texas?

Texas leaves domestic well-water quality to the owner while regulating drillers and construction and allowing Groundwater Conservation Districts to set local rules. Testing therefore starts with three separate questions: what the property risk supports, whether a district has jurisdiction, and which record system contains the well report.

Evidence reviewed 2026-09-14Rural Home Compass editorial desk15 official sources
Homeowner organizing a sealed well-water sample kit, records, and calendar beside a rural window
Use the calendar only after identifying the decision: new-well work, a purchase baseline, routine care, and post-event testing do not have the same purpose.
What this testing guide covers

This plan keeps Texas water-quality guidance separate from TDLR construction rules, makes the Groundwater Conservation District check a required planning step, and explains why reports from 2003 forward and older paper reports require different official searches.

Four different decisions

Start with why you are testing.

01RHC planning advice

New well

Separate construction compliance from water-quality testing.

A licensed Texas driller must follow statewide construction rules and submit the State of Texas Well Report, but private-well water quality is not regulated through one statewide acceptance panel. State-hosted owner guidance recommends testing a new well for bacteria at the wellhead before connecting it to household plumbing; a GCD or local authority may add separate requirements.

  • Use TWDB groundwater-district resources and contact the applicable GCD before drilling or assuming an exemption.
  • Ask the driller and accredited laboratory to document the bacteria sample plus any aquifer-, site-, or recipient-specific additions.

Official guidanceGeneral Groundwater and Private Water Well FAQTexas Well Owner Network Guide to Water SupplyWater Well Drillers and Pump Installers

02Purchase-planning use

Buying a home

Build a current baseline and reconcile both record systems.

Texas agencies describe well testing as common in property transactions but do not establish one universal statewide transfer panel for domestic wells. The contract, lender, insurer, GCD, or other recipient may define what it will accept, while the well report may be in a post-2002 TWDB system, an older TCEQ archive, or a district file.

  • Request the State of Texas Well Report, prior laboratory reports, treatment history, and the well tag or tracking number before sampling.
  • Confirm the receiving party’s analytes, collector, accredited laboratory scope, holding time, and report deadline before collecting.

Official guidanceGeneral Groundwater and Private Water Well FAQLocating a Water Well ReportPrivate Wells

03State recommendation

Routine care

Keep an annual microbial date and choose chemicals from local evidence.

Texas Well Owner Network recommends at least annual E. coli testing. TWDB and TCEQ direct private owners to accredited laboratories and local water-quality evidence; neither source turns public-water standards into a mandatory recurring panel for every private well.

  • Put E. coli or a total-coliform/E. coli laboratory test on one annual household date.
  • Use TWDB county/aquifer data, prior results, nearby activities, and GCD guidance to decide whether nitrate, arsenic, lead, radionuclides, pesticides, VOCs, or PFAS belong in the panel.

Official guidanceResources for Sampling Private Water WellsTexas Well Owner Network FAQHow Is My Drinking Water Quality?

04State recommendation

Flood or repair

Treat microbial testing as an event response, not routine reassurance.

Texas guidance identifies flooding, loss of pressure, and related events as reasons for microbial sampling and directs owners to total-coliform and E. coli testing through an accredited laboratory. Flood source, spills, fuel, pesticides, or other credible releases determine any added chemical tests.

  • Avoid unsafe electrical equipment and ordinary drinking use until the well is assessed, disinfected when appropriate, and sampled.
  • Use the laboratory’s sterile container and timing instructions, then add chemical analyses only when the event or responsible agency supports them.

Official guidanceResources for Sampling Private Water WellsPrivate Wells Under Flood WatersHow to Sample Your Private Well Water for Microbial Contaminants

New wells and regulated work

Build a purpose-specific starting panel.

Texas does not impose one statewide water-quality panel on every new domestic well. Texas Well Owner Network guidance recommends a bacteria sample at the wellhead before connection to household plumbing; other tests depend on aquifer, land use, plumbing, a Groundwater Conservation District, and the intended use of the report.

  • Total coliform and E. coli
  • Nitrate and nitrite
  • Aquifer-relevant arsenic or other inorganics
  • Lead and plumbing-related metals
  • GCD, local, or source-specific analytes

The responsible professional and certified laboratory determine the accepted sample and report. Do not assume a retail package satisfies a regulatory purpose.

Official basis for the new-well panelGeneral Groundwater and Private Water Well FAQTexas Well Owner Network Guide to Water SupplyWater Well Drillers and Pump Installers

Existing wells

Texas recommends routine testing but does not impose one statewide domestic-well panel.

The calendar is not the whole answer

When should the panel change?

Agriculture, pesticide storage or mixing, septic loading, oil and gas activity, fuel, solvents, or industrial land use

Select pesticides, nitrate, VOCs, metals, or other analyses from the credible source and pathway. Texas monitoring finds different conditions by site; do not convert statewide detection programs into a universal panel.

Official guidanceResources for Sampling Private Water WellsPesticides and Groundwater

Pregnancy, an infant, recurrent illness, or another vulnerable household member

National private-well guidance supports additional or more frequent testing in these circumstances. Prioritize microbial indicators and nitrate, then ask the laboratory or health authority what the property context adds.

Official guidanceGuidelines for Testing Well Water

A PFAS notice, firefighting-foam source, landfill, industrial release, or agency investigation near the property

Texas laboratory accreditation now includes named PFAS methods, but laboratory capability is not evidence that every private well needs PFAS testing. Confirm the site pathway and the laboratory’s current drinking-water scope first.

Official guidanceResources for Sampling Private Water WellsEnvironmental Laboratory NELAP Accreditation

Possible GCD or TWDB testing assistance

Some districts advertise free or reduced-cost testing, and TWDB notes occasional case-by-case sampling funds for a limited natural-constituent panel. Availability, jurisdiction, analytes, and bacteria coverage can change; verify them before relying on assistance.

Official guidanceResources for Sampling Private Water Wells

Laboratory and sampling

Confirm the route before collecting water.

  1. Use the current TCEQ accreditation search and verify the drinking-water matrix, exact analytes, methods, and certificate scope. A laboratory listed for one parameter is not automatically qualified for every chemical or PFAS test.

    Official guidanceEnvironmental Laboratory NELAP Accreditation

  2. For microbial sampling, obtain the laboratory’s sterile container and form, follow tap-preparation instructions, keep the sample cold, and plan for analysis within 30 hours rather than collecting before the delivery route is confirmed.

    Official guidanceHow to Sample Your Private Well Water for Microbial Contaminants

  3. Ask whether the GCD, lender, agency, or other recipient requires its own collector, chain of custody, method, or report format. A sound homeowner sample is not automatically acceptable for every formal decision.

    Official guidanceResources for Sampling Private Water WellsGeneral Groundwater and Private Water Well FAQ

Official records

Search by drilling era, then check the district.

Record holder

TWDB holds electronic Submitted Drillers Reports from 2003 forward; TCEQ holds scanned older paper reports; a Groundwater Conservation District may maintain an additional local file.

The post-2002 database does not contain older mailed reports, and mapped coordinates or addresses can be incomplete or incorrect. A blank map result is not proof that no well or report exists; search owner, driller, county, date, the older TCEQ archive, and any GCD file.

Open the official Texas well-report guide ↗

Records and lookup guidanceGeneral Groundwater and Private Water Well FAQLocating a Water Well ReportSubmitted Drillers Reports Database

Look for
  • State of Texas Well Report and tracking number
  • Owner and driller name at construction
  • Well depth, casing, completion date, yield, and proposed use
  • GCD registration, permit, laboratory, treatment, repair, and plugging records

Turn the schedule into questions

Build a starting water-test panel.

The recommender combines your current issue, purchase status, flood or repair history, nearby agriculture, vulnerable occupants, and ZIP-based Texas context. It does not replace the responsible professional or laboratory.

Open the Well Water Test Recommender →

Official sources

These sources were reviewed for this page on 2026-09-14. A build date does not refresh that review.

  1. Texas Water Development Board: Resources for Sampling Private Water WellsReviewed 2026-09-14 · Recheck every 30 days
  2. Texas Water Development Board: General Groundwater and Private Water Well FAQReviewed 2026-09-14 · Recheck every 90 days
  3. Texas Water Development Board and Texas A&M AgriLife Extension: Texas Well Owner Network Guide to Water SupplyReviewed 2026-09-14
  4. Texas A&M AgriLife Extension: Texas Well Owner Network FAQReviewed 2026-09-14 · Recheck every 90 days
  5. Texas Department of Licensing and Regulation: Water Well Drillers and Pump InstallersReviewed 2026-09-14 · Recheck every 90 days
  6. Texas Department of Licensing and Regulation: Private Wells Under Flood WatersReviewed 2026-09-14
  7. Texas Commission on Environmental Quality: How Is My Drinking Water Quality?Reviewed 2026-09-14 · Recheck every 90 days
  8. Texas Commission on Environmental Quality: How to Sample Your Private Well Water for Microbial ContaminantsReviewed 2026-09-14 · Official source updated 2023-07-06
  9. Texas Commission on Environmental Quality: Environmental Laboratory NELAP AccreditationReviewed 2026-09-14 · Recheck every 90 days
  10. Texas Water Development Board: Groundwater Database Reports and Water Quality by CountyReviewed 2026-09-14 · Recheck every 90 days
  11. Texas Water Development Board: Locating a Water Well ReportReviewed 2026-09-14 · Recheck every 90 days
  12. Texas Water Development Board: Submitted Drillers Reports DatabaseReviewed 2026-09-14 · Recheck every 90 days
  13. Texas Groundwater Protection Committee: Private WellsReviewed 2026-09-14 · Recheck every 90 days
  14. Texas Groundwater Protection Committee: Pesticides and GroundwaterReviewed 2026-09-14 · Recheck every 90 days
  15. U.S. Centers for Disease Control and Prevention: Guidelines for Testing Well WaterReviewed 2026-09-14 · Official source updated 2024-07-01