Well Water Test Results Interpreter
Formula
Compare measured levels against EPA Maximum Contaminant Levels (MCL) | Hardness (gpg) = mg/L CaCO3 / 17.1 | Percent of limit = (measured / MCL) x 100
Frequently Asked Questions
How often should I test my well water?
The EPA recommends testing well water at least annually for bacteria (total coliform), nitrates, pH, and TDS. Test more frequently if you notice changes in taste, odor, or color, or after flooding, nearby construction, or septic system issues.
What are the most important contaminants to test for?
Priority tests include coliform bacteria, nitrate/nitrite, pH, hardness, iron, and TDS. Depending on your area, you may also need to test for arsenic, lead, radon, fluoride, and volatile organic compounds. Check with your local health department for area-specific recommendations.
What should I do if my well water fails a test?
Stop drinking the water immediately for health-related failures (bacteria, nitrate, lead). Retest to confirm results. Contact your local health department for guidance. Treatment options include disinfection (UV/chlorine), filtration (reverse osmosis, activated carbon), and water softening.
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