Texas Well Water Testing: What to Test For (2026 Guide)

If your Texas home pulls water from a private well, nobody is checking that water for you. Public water utilities test and report on their supply constantly. Private wells — around 1.2 million of them across Texas — are the homeowner's responsibility, start to finish. Texas well water testing is the single best insurance policy you can buy against contaminants you can't see or taste.

Here is what every private well owner in Texas should be testing for, how often, and where to send the sample. Whether you call it a tx well water test, private well testing texas residents book through the county extension, or a full texas water quality test through a state-certified lab, the basics are the same. Regional realities matter — a well in the Permian Basin faces different risks than a well in East Texas piney woods. For context on how wells are installed in the first place, see our Texas well drilling cost guide.

The Baseline Texas Well Water Tests Everyone Should Run

At minimum, every Texas private well should be tested for these every 12 months:

• Total coliform and E. coli bacteria — the most important single test. Bacteria show up after heavy rain, septic surfacing, or a broken wellhead seal.
• Nitrates and nitrites — especially important for households with infants or pregnant women. Agricultural runoff and septic drain fields are common sources.
• Total dissolved solids (TDS) — a general water quality indicator, useful for tracking changes over time.
• pH and hardness — not regulatory concerns but they affect plumbing, appliances, and water taste.

That baseline panel runs $50–$150 at a state-certified lab. Many Texas counties offer reduced-cost testing through the county extension office or health department. The Texas A&M AgriLife Extension Service publishes test kits and guidance specifically for rural landowners.

Regional Texas Well Water Testing Priorities

Beyond the baseline, additional contaminants matter more in some regions than others. Know your aquifer and your risks.

Permian Basin and West Texas

Decades of oil field activity raise concerns about hydrogen sulfide, TDS, chloride, and occasional hydrocarbons in Ogallala Aquifer wells. Test for TDS, chlorides, sulfates, and BTEX compounds (benzene, toluene, ethylbenzene, xylenes) every 2–3 years. Private wells within a mile of active or abandoned oil infrastructure should test annually.

Hill Country and Edwards Aquifer Zone

Limestone karst geography gives Edwards Aquifer wells exceptional water quality — but also fast contamination pathways. Surface contaminants can reach the aquifer within hours of a storm. Annual bacteria and nitrate testing is critical. Add a quarterly bacteria test during drought-rebound rainfall.

Gulf Coast and Coastal Bend

Saltwater intrusion affects Gulf Coast Aquifer wells, especially after hurricanes or extended drought. Test chlorides and TDS annually. Add bacteria testing after any significant flooding event — a wellhead that was submerged is effectively contaminated until proven otherwise.

East Texas Piney Woods

Carrizo-Wilcox Aquifer wells often show elevated iron, manganese, and low pH. These are aesthetic and plumbing issues, not always health issues, but they push homeowners toward treatment. Test iron, manganese, and pH every 2–3 years.

Blackland Prairie and Agricultural Regions

Central Texas row-crop and livestock country sees the highest risk for agricultural nitrates and pesticide runoff. Annual nitrate testing is non-negotiable for any home with infants, pregnant women, or immunocompromised residents.

Panhandle and High Plains

Declining Ogallala Aquifer water levels concentrate natural contaminants. Test for arsenic, fluoride, and uranium every 3–5 years in Panhandle wells. Elevated arsenic shows up sporadically across the region.

PFAS Testing in Texas

PFAS ("forever chemicals") have been detected at multiple Texas military bases and industrial sites, including Carswell (Fort Worth), Ellington Field (Houston), and several Air Force installations. If your well is within 5 miles of a current or former military base, firefighter training site, or chrome plating operation, consider a PFAS test ($200–$400). PFAS is not part of standard panels and must be requested specifically.

The EPA established national PFAS drinking water limits in 2024. Private wells are not required to meet those limits, but the data now exists to make informed decisions about filtration (reverse osmosis and GAC filters remove the major PFAS compounds).

How Often to Test Texas Well Water

Test	Frequency	Notes
Total coliform and E. coli	Annually	After floods or repairs, retest immediately
Nitrates and nitrites	Annually	More often with infants or pregnant residents
TDS, pH, hardness	Every 2–3 years	Baseline water quality tracking
Arsenic, lead, fluoride	Every 3–5 years	Region-dependent (Panhandle, West TX)
PFAS	Once, then as needed	Prioritize if near military/industrial sites
Full panel (after drilling)	New well, year 1	Baseline for every future test

Where to Get Your Texas Well Water Tested

You need a state-certified lab. Testing options in Texas include:

• Texas A&M AgriLife Extension Service — low-cost basic water testing by county extension office.
• Texas Department of State Health Services (DSHS) certified labs — full-service private labs across all regions. DSHS publishes a searchable directory.
• University of Nebraska / Texas Tech water labs — occasionally cheaper for Panhandle residents.
• Mail-in private lab kits — usable when local options are limited; verify state certification before mailing a sample.

Always collect samples per the lab's specific instructions. Bacteria tests in particular require sterile bottles and refrigerated transport within 30 hours. A bad sample ruins the test.

Frequently Asked Questions About Texas Well Water Testing

How much does Texas well water testing cost?

A basic bacteria and nitrate panel runs $50–$150. Full first-year panels including arsenic, fluoride, TDS, and metals run $150–$400. PFAS testing adds another $200–$400.

Does Texas require well water testing?

Texas does not mandate annual private well testing for existing wells. New wells must have a bacterial test on the TDLR State Well Report, and real estate transactions often trigger a buyer-requested test. Testing is the homeowner's responsibility.

Can I test Texas well water at home?

At-home test strips exist for pH, hardness, chlorine, and rough nitrate readings. They are fine for tracking trends but not for health decisions. Anything that informs a treatment decision — bacteria, nitrates, arsenic — should be a lab test.

What do I do if my Texas well water fails a test?

Call a licensed Pump Installer or water treatment company immediately if the issue is bacteriological — shock chlorination often resolves it. For nitrates, arsenic, or PFAS, you are looking at a reverse osmosis or specialized filter install. Retest after any treatment change.

How soon after drilling should I test a new Texas well?

Within 30 days. Run a full panel — bacteria, nitrates, TDS, pH, and region-appropriate metals. That becomes the baseline you compare every future annual test against.

Find a Texas Water Testing or Treatment Provider

Every water treatment and testing provider in our Texas directory is filtered by service area and county. Start with one who knows your aquifer — East Texas iron problems are not the same as West Texas TDS problems.

→ Find a Texas well water testing provider