Free Tool

Well Water Test Result Interpreter

Enter the values from your private well water lab report. Get instant plain-language results, pass/fail status for each parameter, and FHA / VA / USDA loan compliance in one click.

Enter the values from your lab report below. Leave any parameter blank if it wasn’t tested. For bacteria, select the result from the dropdown. All data stays in your browser — nothing is sent anywhere.

Bacteria

Total Coliform
Required: Absent (0 CFU/100mL)
E. coli (Fecal Coliform)
Required: Absent (0 CFU/100mL)

Inorganic Parameters

Nitrate (as N)
MCL: 10 mg/L
Nitrite (as N)
MCL: 1 mg/L
Arsenic
MCL: 0.010 mg/L (10 ppb)
Lead
Action Level: 0.015 mg/L
pH
SMCL: 6.5–8.5
Fluoride
MCL: 4.0 mg/L; SMCL: 2.0
Iron
SMCL: 0.3 mg/L
Manganese
Health advisory: 0.3 mg/L; SMCL: 0.05
Hardness (as CaCO₃)
No MCL. >120 mg/L = hard water
TDS (Total Dissolved Solids)
SMCL: 500 mg/L
Turbidity
Target: <1 NTU
Copper
Action Level: 1.3 mg/L

Parameter Results

Recommended Actions

    Note: This tool checks values against EPA Maximum Contaminant Levels (MCLs) and Secondary MCLs. FHA, VA, and USDA loan standards are based on these same MCLs. Results are for informational purposes only. Always confirm test results with your certified laboratory report and consult your lender for loan-specific requirements.
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    Recommended Tool: A Digital TDS Meter

    This interpreter works with results from a certified lab — that's still the only test accepted for loan and health department purposes. For quick spot-checks between your annual certified tests, a basic handheld TDS meter is an inexpensive way to notice if your water's mineral content has changed.

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    How to Use This Tool

    1. Get your lab report

      Your state-certified lab will send you a report (usually PDF or email) with a list of parameters, your measured values, and the applicable standards.

    2. Enter values into the fields above

      Match the parameter names on your report to the fields above. Most parameters will use mg/L (milligrams per liter) as their unit. If your report shows “ND” or “Not Detected,” enter 0 or leave the field blank.

    3. Click Interpret

      The tool will compare each value against EPA standards and show you which parameters pass, which fail, and what to do about any failures.

    4. Review loan standards

      If you’re in a real estate transaction, the FHA/VA/USDA badge will show whether your results meet federal loan standards.

    Read the full parameter guide for more detail on what each measurement means →