Radon in Water Testing Labs in Washington (4 state-certified labs)
Labs on Washington's official certification list that test drinking water for radon in water, with the ones that take homeowner samples first.
4 named for radon in water itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Washington but on its list.
USGS estimate for Washington.
How many labs test for radon in water in Washington
4 labs on Washington's official drinking-water lab list are certified to test for radon in water. All 4 are named for radon in water on the list. 4 of them are marked as taking samples from the public. They are listed first. 4 are located outside Washington.
The list is published by the Washington State Department of Ecology - Lab Accreditation Program (with WA DOH). List version on file: Information current as of 11/13/2026. Fetched 2026-11-15 (UTC).
Washington labs certified for radon in water
Marked as taking public samples (4)
| Lab | Location | Radon in water certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| EMSL Analytical, Inc. - Cinnaminson | Cinnaminson, NJ | Named on the official list | Public samples: yes (per state) | 07/14/2027 |
| Eurofins South Bend | South Bend, IN | Named on the official list | Public samples: yes (per state) | 01/01/2027 |
| Pace Analytical National Center for Testing & Innovation TN | Mt. Juliet, TN | Named on the official list | Public samples: yes (per state) | 08/19/2027 |
| Pace Analytical Services, LLC - Greensburg, PA | Greensburg, PA | Named on the official list | Public samples: yes (per state) | 02/04/2027 |
How the Washington list marks public samples (whole list). Yes/no from Ecology's 'Search labs that accept public samples' list, where the label is 'Accepts Commercial/Public Samples'. That is broader than 'homeowner' and includes some utility labs, so call before you send a sample.
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 Washington
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 7 of Washington's 39 counties in Zone 1 (highest potential), 14 in Zone 2 and 18 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 1,023,853 people in Washington 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: Washington.
Other tests in Washington
WA Ecology - Environmental Laboratories Accredited for Drinking Water Analyses (with scopes).
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