About 23 million U.S. households drink from a private well — and no one tests that water unless you do. These guides explain when to test, what the numbers mean, and what to do if something comes back wrong.
A plain-English guide to coliform bacteria in well water: what a positive test means, what to do next, costs, timing, and prevention.
Tell us when you last tested and we’ll email you when your annual bacteria and nitrate tests come due.
