Best Well Water Test Kits: How to Choose the Right One
The 'best' well water test depends on what you need the answer for. Here are the three types, what each is good for, and a checklist for picking a lab.
The three types
| Type | Best for | Limits |
|---|---|---|
| Health department or public lab | The yearly safety test at the lowest cost. Often accepted for home sales. | Less convenient: pickup or drop-off, fixed sampling days. Panels vary by state. |
| Mail-in certified lab kit | A broad panel without leaving home. Useful before buying treatment. | Costs more. Bacteria shipping times are tight. Certification varies, so check it. |
| Home test strips | Quick screening, and checking a softener or filter between lab tests | Ranges, not exact numbers. Not reliable for arsenic, lead or other low-level contaminants. |
Not sure which you need? Read home kit vs lab test.
What a good well test should cover
At minimum, the CDC's yearly four, plus what you need to size treatment:
- Total coliform bacteria (and E. coli if positive)
- Nitrate (and ideally nitrite)
- pH and total dissolved solids
- Hardness, iron, manganese
- Arsenic, lead, copper, and uranium if it's common in your area
- Optional extras: sulfate, chloride, sodium, fluoride, tannins, hydrogen sulfide. Specialty tests (PFAS, VOCs, radon, pesticides) usually cost extra and matter most near known sources.
Checklist before you buy a mail-in kit
- Is the lab certified for drinking water? Look it up in your state's program, listed through EPA's certification contacts.
- Does it include bacteria, and how is it shipped? Bacteria samples need fast, cold shipping.
- Are the results real numbers with reporting limits? Not just "pass/fail".
- Are the reporting limits below the standards? E.g. arsenic must be measurable below 0.010 mg/L.
- Does the report compare to EPA limits and explain what to do?
- Is the price clear, including return shipping and add-ons?
Red flags
- A "free water test" offered by a company that sells treatment systems. Get an independent lab result before buying anything.
- Kits that only give colors or "safe/unsafe" with no numbers
- No named lab, or no certification information
After you get results
Use our guide to reading well water test results to see what passes, what fails, and which fix fits.
Frequently asked questions
What is the best water test kit for well water?
For health decisions, a test from a state-certified lab, through your health department or a mail-in lab kit. Strip test kits are fine for quick screening but not for bacteria, nitrate, arsenic or lead.
What is the best well water test kit?
For most homeowners, the best value is a test from a state-certified lab, often through your county health department. If you want convenience, choose a mail-in kit from a lab certified for drinking water that covers bacteria, nitrate, metals and minerals. Strip kits are for screening only.
How much should a well water test kit cost?
Strip kits are inexpensive. Bacteria-only tests at public labs can be under $50. Broad lab panels covering bacteria, nitrate, metals and minerals commonly cost a few hundred dollars. Specialty tests like PFAS, VOCs or radon usually cost extra.
Do mail-in kits test for bacteria?
Some do, but bacteria samples must reach the lab within a short holding time (often about a day). Check the kit’s shipping arrangements before you rely on it for bacteria.
Sources
- Guidelines for Testing Well Water, U.S. Centers for Disease Control and Prevention
- Contact Information for Certification Programs and Certified Laboratories for Drinking Water, U.S. EPA
- Should I Have My Water Tested?, Pennsylvania Department of Environmental Protection
- Public Environmental and Water Testing Prices, Wisconsin State Laboratory of Hygiene
- Private Drinking Water Wells, U.S. EPA
Sources checked October 24, 2026. Found an error? Tell us and we will fix it.