If you own a private well, you are your own water utility. There is no municipal treatment plant, no government oversight, and no routine testing requirement. That responsibility — and that power — is entirely yours.
Test annually, at minimum
The EPA and CDC recommend testing private well water at least once a year for bacteria (coliform), nitrate, and any contaminants known to be a concern in your area. More frequent testing is warranted if:
- You notice a change in taste, odor, or appearance
- A nearby land use has changed (new farm, construction, industrial activity)
- You've had recent flooding or a natural disaster
- Someone in your household is pregnant, elderly, or immunocompromised
- Your well or pump was recently serviced
What to test for
Basic annual testing should cover coliform bacteria, nitrate, and pH. But the right expanded panel depends on where you live — local geology, land use, and historical contamination patterns all affect what's likely in your groundwater.
That's what YourWaterReport is for. Look up your county to see which contaminants have been detected in your area and get a testing recommendation tailored to your location.
Use a certified lab
Water testing results are only as reliable as the lab doing the analysis. Always use a state-certified laboratory. Your state environmental or health agency maintains a list of certified labs — or use our Lab Finder to find one near you.
Avoid home test kits for anything beyond basic screening. Professional lab analysis is more sensitive, more accurate, and provides legally defensible results if you ever need them for a real estate transaction or legal matter.
Understand your results
Lab reports can be confusing. Results are reported in different units (mg/L, µg/L, pCi/L), and it's not always obvious which numbers matter. Our Understanding Results guide walks you through how to read a water test report and what the numbers mean for your family's health.
Know when to treat
Not every detection requires treatment. Many contaminants are present in groundwater at levels well below health thresholds. Treatment makes sense when:
- A contaminant exceeds the EPA Maximum Contaminant Level (MCL)
- A contaminant exceeds EPA health advisory levels
- You or a family member has a condition that increases sensitivity to a specific contaminant
See our Water Treatment guide for an overview of treatment options by contaminant type.
Keep records
Maintain a file with your well construction report, pump service records, and all water test results. This history is invaluable if you sell your home, notice a change in water quality, or need to troubleshoot a problem.