Brandywine Science Center
204 Line Road
Kennett Square, PA 19348
- Coliform bacteria
- Chemistry
Call to confirm the lab accepts private well samples, and ask about price and turnaround.
Well water testing in Chester County, Pennsylvania
Labs copied from the official Pennsylvania certified lab list (last verified 2026-10-29). All Pennsylvania labs
The official Pennsylvania list shows 2 certified labs in Chester County. Call before you sample to confirm the lab accepts private well water and to ask about bottles, prices and drop-off times.
Certified labs in Chester County
H.O. Thompson Testing Lab
104 Valley View Drive
Parkesburg, PA 19365
- Coliform bacteria
- Chemistry
Call to confirm the lab accepts private well samples, and ask about price and turnaround.
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What to test for
- Test every year for total coliform bacteria, nitrates, total dissolved solids, and pH. Use a state-certified drinking water laboratory. Source
- Penn State Extension: about half of PA private wells that have been tested show at least one water-quality problem, yet only about half of wells have ever been tested. Source
- 2025 Penn State citizen-science study: PFAS detected in 65% of 167 private wells sampled statewide; 18% exceeded EPA health-related limits, with higher detections in southeastern PA. Source
After a flood in Chester County
EPA says to test a private well for bacteria after flooding before drinking the water again. Check current flood alerts and Flood Watch, and read flood season testing. EPA: your well after a flood
Local help
Your Chester County or local health department can tell you about local well testing, including any free or low-cost programs. State contact: PA DEP — private well water testing guidance.
Questions
Where can I test well water in Chester County, PA?
The official Pennsylvania certified lab list shows 2 labs in Chester County; they are listed on this page with phone numbers. Call first to confirm they accept private well samples.
How often should I test my well?
EPA recommends testing every year for total coliform bacteria, nitrates, total dissolved solids and pH, and testing right away after flooding, well repairs, or a change in taste, color or smell.
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