6 named for radon in water itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Arizona but on its list.
USGS estimate for Arizona.
How many labs test for radon in water in Arizona
6 labs on Arizona's official drinking-water lab list are certified to test for radon in water. All 6 are named for radon in water on the list. The Arizona list does not say which labs take samples from homeowners, so call a lab before you send one. 5 are located outside Arizona.
The list is published by the Arizona Department of Health Services (ADHS) - Bureau of State Laboratory Services, Office of Laboratory Licensure & Certification (Environmental Laboratory Licensure). List version on file: current as of Saturday, November 7, 2026. Fetched 2026-11-07 (UTC).
Arizona labs certified for radon in water
| Lab | Location | Radon in water certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| ACZ Laboratories, Inc. | Steamboat Springs, CO | Named on the official list | Public samples: ask the lab | Not on the list |
| Eurofins Pomona | Pomona, CA | Named on the official list | Public samples: ask the lab | Not on the list |
| Eurofins South Bend | 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 |
| PACE Analytical Services, LLC - Greensburg PA | Greensburg, PA | Named on the official list | Public samples: ask the lab | Not on the list |
| Radiation Safety Engineering, Inc. | Chandler, AZ | Named on the official list | Public samples: ask the lab | Not on the list |
How the Arizona list marks public samples (whole list). Not stated per lab. ADHS's private-well pamphlet says independent laboratories can test private well water and points well owners to this list; it does not say which labs take samples from well owners.
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 Arizona
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 0 of Arizona's 15 counties in Zone 1 (highest potential), 15 in Zone 2 and 0 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 218,170 people in Arizona 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: Arizona.
Other tests in Arizona
- 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)
- ADHS Safe Drinking Water Commercial Lab List (List of Arizona Certified Commercial Drinking Water Laboratories) (official list)
ADHS Safe Drinking Water Commercial Lab List (List of Arizona Certified Commercial Drinking Water Laboratories).
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