Radon in Water Testing Labs in Pennsylvania (7 state-certified labs)
Labs on Pennsylvania's official certification list that test drinking water for radon in water, with the ones that take homeowner samples first.
7 named for radon in water itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Pennsylvania but on its list.
USGS estimate for Pennsylvania.
How many labs test for radon in water in Pennsylvania
7 labs on Pennsylvania's official drinking-water lab list are certified to test for radon in water. All 7 are named for radon in water on the list. The Pennsylvania list does not say which labs take samples from homeowners, so call a lab before you send one. 5 are located outside Pennsylvania.
The list is published by the Pennsylvania DEP - Laboratory Accreditation Program. List version on file: STALE - report dated 6/11/2024. Fetched 2026-10-29 (UTC).
Old list. This list is from PA DEP's bulk drinking-water reports printed June 11, 2024 (chemistry and microbiology; the microbiology file is named 06-13-2024). PA DEP's own private-well water-testing page still links these two June 2024 reports (checked Nov 14, 2026); its live lab search did not respond to us on Oct 29 or Nov 14, 2026. Labs may have been added, dropped or changed since then.
Pennsylvania labs certified for radon in water
| Lab | Location | Radon in water certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| EMSL Analytical Inc | Cinnaminson, NJ | Named on the official list | Public samples: ask the lab | Not on the list |
| Eurofins Eaton Analytical, LLC | South Bend, IN | Named on the official list | Public samples: ask the lab | Not on the list |
| Eurofins St Louis | Earth City, MO | Named on the official list | Public samples: ask the lab | Not on the list |
| GEL Laboratories LLC | Charleston, SC | Named on the official list | Public samples: ask the lab | Not on the list |
| PA DEP Bureau of Laboratories | Harrisburg, PA | Named on the official list | Public samples: ask the lab | Not on the list |
| Pace Analytical National Center for Testing & Innovation | Mount Juliet, TN | Named on the official list | Public samples: ask the lab | Not on the list |
| Pace Analytical Services LLC - Greensburg PA | Greensburg, PA | Named on the official list | Public samples: ask the lab | Not on the list |
How the Pennsylvania list marks public samples (whole list). Not stated in the report.
Before you send a sample, call the lab to confirm it is currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Status can change between list updates.
Why test for radon in water in Pennsylvania
Most of the risk from radon in a well comes from breathing the gas the water releases indoors, not from drinking it. Read our radon in water explainer.
EPA's radon zone map puts 49 of Pennsylvania's 67 counties in Zone 1 (highest potential), 17 in Zone 2 and 1 in Zone 3. [1] That map is about radon in indoor air, and EPA says it should not be used to decide whether an individual home needs testing. If radon is found in your air and you have a well, EPA suggests testing the water too.
About 3,470,761 people in Pennsylvania used private wells in 2015, by the USGS estimate of people on domestic self-supplied water. [2] Federal limits are written for public water systems, not private wells, so testing is up to the owner.
For tests that depend on your home (farms nearby, old plumbing, a new baby), use the which-tests checklist. When results arrive, check your numbers against EPA's limits. State guidance, county data and every lab: Pennsylvania.
Other tests in Pennsylvania
- U.S. EPA, Map of Radon Zones, county list (EPA 402/A-16/001, spreadsheet Sep 2025)
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- PA DEP Accredited Labs Report - Drinking Water (chemistry + microbiology) (official list)
- PA DEP Accredited Labs Report - Drinking Water (chemistry) (official list)
PA DEP Accredited Labs Report - Drinking Water (chemistry + microbiology).
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