Should I have well water tested before buying a home?
Reviewed August 2026 by Shannon Miles Group
Yes. Water quality testing and water quantity testing are two different questions. Testing for quality does not prove the well can produce enough water. Testing for production does not prove the water is safe to drink. Both are important. The appropriate testing depends on the property, well, and potential contamination concerns. Use a qualified laboratory and professional evaluator. The Texas A&M AgriLife Extension Service and the Texas Well Owner Network are excellent resources for well water testing guidance.
Water quality versus water quantity.
When buying a home with a private well, two separate evaluations are needed. Many buyers assume that if the water is running from the tap, everything is fine. But the presence of water does not tell you about its quality, and clean-looking water does not tell you the well can produce enough for your household.
Water quality testing
Water quality testing evaluates the chemical, biological, and physical characteristics of the water. The appropriate testing depends on the property, well, and potential contamination concerns. There is no universal test panel that fits every situation.
Common tests include bacteria (total coliform and E. coli), nitrate, nitrite, pH, total dissolved solids, hardness, iron, manganese, and sulfur. Additional testing may be needed depending on nearby land uses, such as testing for pesticides near agricultural operations or testing for volatile organic compounds near industrial sites.
The Texas A&M AgriLife Extension Service and the Texas Well Owner Network provide excellent guidance on well water testing. They offer water testing through the Texas A&M AgriLife Extension Soil, Water and Forage Testing Laboratory. This is the recommended source for water quality testing in Texas.
Water quantity testing
Water quantity testing measures the well's production rate, typically in gallons per minute. This is called a flow test or yield test. A well professional conducts this test by measuring how much water the well can produce over a set period.
The flow test tells you whether the well can meet the household's peak demand. A standard household typically needs 5 to 10 gallons per minute, but this depends on the number of bathrooms, irrigation needs, and lifestyle. The well's yield can change over time due to drought, changes in the aquifer, or other factors.
Testing quality does not prove production. A well can produce water that looks clean but tests positive for bacteria or other contaminants. Similarly, a well can produce abundant water that is safe to drink but may not produce enough for a household with high water demand. Both tests are needed.
Do not attempt to perform water quality testing or well flow testing yourself. A qualified laboratory handles water quality testing, and a licensed well professional conducts flow tests. The results are reliable and defensible when performed by professionals.
For a broader evaluation of the well system, see What should I have inspected on a private well before buying? For a complete overview of buying a property with a well, see What should I know before buying a property with a private well?
Well water testing in Northeast Texas.
Water quality in Northeast Texas varies by location and aquifer. Some areas have naturally occurring minerals that affect taste, staining, or odor. Iron and sulfur are common in some parts of the region. Hard water is also common. These are not necessarily health concerns, but they may require treatment for comfort and aesthetics.
Bacterial contamination is a concern for any private well. Proper well construction and maintenance reduce the risk. A coliform bacteria test is a standard part of well water testing. If bacteria are present, the well may need disinfection, and the source of contamination should be identified.
The Texas A&M AgriLife Extension Service offers water testing services to Texas residents. Their Soil, Water and Forage Testing Laboratory can test for a range of parameters. Contact your local AgriLife Extension office in Lamar County or your county for guidance on what to test for based on your specific property and concerns.
Key factors for well water testing.
- Quality and quantity are different. Testing one does not tell you about the other. Both are important for a complete picture.
- No universal test panel. The right tests depend on the property, well, and potential contamination concerns. Consult a professional for guidance.
- Use a qualified laboratory. The Texas A&M AgriLife Extension Soil, Water and Forage Testing Laboratory is a trusted source for water quality testing.
- Hire a professional for flow testing. A licensed well professional should conduct the flow test. Do not attempt this yourself.
- Test before closing. Include water testing as a contingency in your purchase contract. This gives you the opportunity to negotiate if issues arise.
- Plan for ongoing testing. Even after you buy, annual water testing is a good practice for private well owners. Water quality can change over time.
More answers you might find useful.
What should I have inspected on a private well before buying?
What should I know before buying a property with a private well?
What is the difference between a private well and community water?
What should I know about buying a home with a septic system?
We are happy to help you with your well questions.
Not every well testing question fits neatly into a guide. Call us, stop by the office at 2322 Lamar Ave. in Paris, or send a note. We answer real questions from real people every day.