Know what’s in your well water
EPA estimates that about 15 percent of people in the U.S., more than 43 million, rely on private wells for drinking water. No federal agency tests those wells for them. We collect official state and federal guidance on testing your well, with a link to the source for every fact.
Find free & low-cost testing in your state
Sources: EPA: Private Drinking Water Wells; CDC: Guidelines for testing well water.
Start here
Testing by state
All 50 states: free or low-cost programs, official well program pages, and certified lab lists.
What to test for
CDC’s baseline: bacteria, nitrate, TDS, and pH every year, plus local contaminants your health department flags.
How we check facts
Every claim links to an official source, and we list the date we last checked it.
Coming next
County-level testing programs, contaminant-by-contaminant treatment guides, a test-results explainer, and a well checklist for home buyers.