Free Tool

Water Test Interpreter

Enter your numbers. Get your plan. This tool compares your water test results against EPA standards and tells you what needs attention, what to treat first, and which systems solve each problem.

Health Contaminants

These are the most important to check. Leave blank if not tested.

Listed as 'Total Coliform' or 'E. coli' on your test. Result is Present or Absent.
Listed as 'Nitrate' or 'NO3' on your test report.
Listed as 'Arsenic' or 'As' on your test. Measured in ppb (parts per billion).
Listed as 'Fluoride' or 'F' on your test report.

Common Well Water Issues

Enter any values from your test report. Skip what you don't have.

Listed as 'pH' on your test. Scale of 0–14. Below 7 is acidic. Above 7 is alkaline.
Listed as 'Iron' or 'Fe' on your test report.
Listed as 'Manganese' or 'Mn' on your test report.
Listed as 'Hydrogen Sulfide' or 'H2S' on your test. If not tested, note if water smells like rotten eggs.
Listed as 'Hardness' or 'Calcium Carbonate' on your test. If in mg/L, divide by 17.1 to get GPG.
Listed as 'TDS' or 'Total Dissolved Solids' on your test. A general water quality indicator.
Is your water cloudy, or do you see sand/particles in it?

Free. No account needed. Results appear instantly.

How to Use This Tool

  1. Get your water tested. Use a state-certified lab or mail-in service like Tap Score. A basic panel costs $30–$80.
  2. Enter your numbers. Type in the values from your test report. Leave blank any you don't have — the tool only analyzes what you enter.
  3. Read your results. Each contaminant is rated: Safe, Action Needed, or Urgent. The action plan tells you what to treat first and what it costs.

Don't Have a Water Test Yet?

Start with a comprehensive well water panel. At minimum, test for bacteria, nitrates, pH, iron, hardness, and TDS. Read our How to Read a Water Test Report guide for help understanding your results.

Frequently Asked Questions

How does the Water Test Interpreter work?

Enter the numbers from your water test report. The tool compares each value against EPA standards and health thresholds. It generates a plain-English diagnosis with treatment recommendations ranked by priority.

Is this tool free?

Yes. 100% free. No account needed. Results appear instantly. You can optionally save your results by entering your email.

What values should I enter?

Enter any values from your lab report. The most important: bacteria, nitrates, pH, iron, hardness, and TDS. Leave blank what you don't have.

Where do I get my water tested?

Use a state-certified lab ($30–$80 for a basic panel). Mail-in services like Tap Score cost $100–$200 for a full panel. For bacteria and health contaminants, always use a certified lab.