Private well water testing in Pennsylvania, by county
Penn State's Agricultural Analytical Services Lab says there are over 1 million private wells in Pennsylvania serving 3.5 million people, and that only about half have ever been tested. Pennsylvania does not regulate private well water quality; DEP recommends testing every year for total coliform bacteria, nitrates, total dissolved solids and pH.[1][2]
County guides
- Chester County Last verified 2026-10-25
The Chester County Health Department no longer tests well water; it keeps a list of labs instead. Penn State's mail-in lab charges $60-$220 per package, and its testing data for Ch...