You cannot treat what you have not tested. The first step for every well owner is a water test[3].
We compared the top mail-in well water test kits. All use certified labs — not DIY strips.
Quick Comparison: Top 3 Well Water Test Kits
| Service | Contaminants Tested | Turnaround | Price | |
|---|---|---|---|---|
| Tap Score Essential Well Our Pick | 54 contaminants | 5–7 business days | $180–$220 | Check Price |
| Tap Score Advanced Well Most Thorough | 111 contaminants | 7–10 business days | $350–$400 | Check Price |
| National Testing Labs Budget Pick | 83 contaminants | 7–10 business days | $150–$190 | Check Price |
Why We Recommend Lab Tests, Not DIY Strips
DIY test strips give rough estimates. Good enough for pH and hardness checks between lab tests.
But for health contaminants — bacteriaColiform BacteriaA group of bacteria used as indicators of potential contamination. Total coliform presence suggests a pathway for pathogens to enter your well.EPA MCL: 0 (no coliform should be present)Learn more → (contamination indicators), nitratesNitratesCompounds that enter groundwater from fertilizers, septic systems, and animal waste. Especially dangerous for infants under 6 months (blue baby syndrome).EPA MCL: 10 mg/L (ppm)Learn more → (fertilizer compounds), arsenicArsenicA toxic element found naturally in bedrock that dissolves into groundwater. Odorless and tasteless, making testing the only way to detect it.EPA MCL: 10 ppb (0.01 mg/L)Learn more → (toxic element), leadLeadA toxic metal that typically enters water from corroded plumbing, solder, or fixtures rather than the well itself. No safe level of lead exposure.EPA Action Level: 15 ppb (0.015 mg/L)Learn more → (toxic metal) — you need certified lab accuracy[4].
A wrong result on arsenic or bacteria can mean the difference between treating and ignoring a real threat.
Detailed Reviews
Tap Score Essential Well Water Test — Our Pick
Tap Score covers all the critical contaminants in one kit. The online report explains each result in plain English with EPA standards and health context[1].
Who this is for: Most well owners. Covers everything you need for a baseline.
Tap Score Advanced Well Water Test — Most Thorough
Adds VOCs, pesticides, PFAS, and radioactive contaminants. Choose this if you live near industrial sites, old farms, or military bases[1].
National Testing Laboratories — Budget Pick
Good coverage at a lower price. The report is less polished than Tap Score but the lab analysis is solid[2].
Check price at National Testing Labs
The Cheapest Option: Your State Lab
Most state labs test bacteria and nitrates for $15–$30. Some test a broader panel for $50–$100. Contact your county health department to arrange it[3].
State labs are the most affordable option for basic annual testing.
What to Do After You Get Results
Enter your numbers in our Water Test Interpreter for a plain-English diagnosis and treatment plan. Or read our How to Read a Water Test Report guide.
Frequently Asked Questions
Are mail-in test kits accurate?
Yes — if they use a certified lab. Tap Score and National Testing Labs both use EPA-certified labs[5]. DIY strips are not accurate enough for health decisions.
How much does testing cost?
State lab basics: $30–$50. Mail-in comprehensive: $100–$300. Premium panels: $300–$500[3].
References
- Tap Score (SimpleLab). "Well Water Test Panels." 2025. https://mytapscore.com
- National Testing Laboratories. "Well Water Test Packages." 2025.
- U.S. EPA. "Private Wells: Testing Your Water." 2024. https://www.epa.gov/privatewells
- CDC. "Testing Private Well Water." 2024. https://www.cdc.gov/healthywater/drinking/private
- Water Quality Association. "Choosing a Water Testing Service." 2024. https://wqa.org