Contaminants

A rotten egg or sulfur smell in well water usually means hydrogen sulfide. How to tell if the cause is your well or your water heater, and which fixes match which levels.

Radon from well water escapes into indoor air when you shower and wash. Who should test, the levels states use, and how aeration and carbon (GAC) systems compare.

Orange stains, black specks or crusty faucets? How to read hardness, iron and manganese results for a well, EPA reference levels, and when a softener vs an iron filter fits.

In private wells, lead usually comes from plumbing, fixtures or pump parts, not the aquifer. How corrosive water causes it, how to sample, and certified ways to reduce it.

PFAS (‘forever chemicals’) in private wells: current EPA limits and proposed changes, who should test, and how to choose a filter certified to reduce PFOA and PFOS.

Total coliform or E. coli in your well test? What each result means, what CDC says to do next, why shock chlorination doesn’t always last, and when UV makes sense.

EPA’s nitrate limit is 10 mg/L (as nitrogen). Learn why infants are most at risk, when to test, why boiling makes it worse, and which treatments reduce nitrate.

Arsenic in private wells usually comes from natural rock. Learn EPA’s 10 µg/L limit, who’s at risk, how to test, and which certified treatments reduce it.