Radon in Williamsburg city, Virginia
Last updated
EPA’s 1993 map does not list Williamsburg city separately; this is the zone EPA gave James City County.
Williamsburg city is one of 39 Virginia counties (out of 133) that EPA places in Zone 3. 2 ZIP codes reach into the county.
What the zone means for a Williamsburg city home
Zone 3 means EPA predicted a county-wide average below 2 pCi/L. Many Williamsburg city homes will test low, but EPA has found homes above the action level in every Zone 3 county it studied, so a low zone is not a pass.
A short-term test kit costs little and takes two to seven days. If your result is 4 pCi/L or higher, EPA recommends a follow-up test and, if it is confirmed, a mitigation system, which typically uses a pipe and fan to pull soil gas from under the foundation and vent it above the roof. Check a result with the level calculator and plan your next step with the follow-up planner.
Finding a radon professional in Williamsburg city
We have not added Virginia professionals yet. Until we do, use the Virginia radon program (Virginia Department of Health, Office of Radiological Health, 804-864-8161) at www.vdh.virginia.gov/radiological-health/indoor-radon-program, or the national certification boards: the NRPP pro search and NRSB find a pro. Or ask for free quotes below.
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Get radon quotes from certified pros in Williamsburg city
Tell us what you need and we will try to connect you with up to three state-certified or licensed radon professionals who work in your area. It is free and there is no obligation.
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ZIP codes in Williamsburg city
Open a ZIP to see every county it touches. Where a ZIP crosses a county line, the percentage is the share of its land area inside Williamsburg city.
Virginia radon program
EPA lists Virginia Department of Health, Office of Radiological Health (phone 804-864-8161) as the state contact. State programs can tell you about local test results, discounted kits, disclosure rules for home sales and credentialed professionals. Website: www.vdh.virginia.gov/radiological-health/indoor-radon-program.
Back to all Virginia counties.
Frequently asked questions
What is the EPA radon zone for Williamsburg city, Virginia?
EPA's Map of Radon Zones puts Williamsburg city in Zone 3 (low potential): Predicted average indoor screening level below 2 pCi/L. EPA did not list Williamsburg city separately, so this is the zone of James City County.
Do I need to test for radon in Williamsburg city if the zone is low?
Yes. EPA says the zone map should not be used to decide whether a single home needs testing. Homes with high radon are found in every zone, and neighboring homes can test very differently. Testing is cheap and the only way to know your level.
How do I find a certified radon professional in Williamsburg city?
Ask the Virginia radon program (Virginia Department of Health, Office of Radiological Health, 804-864-8161) for its list of credentialed professionals, or search the national certification boards, NRPP and NRSB. You can also ask for free quotes with the form on this page.
How many ZIP codes are in Williamsburg city?
2 ZIP codes have at least part of their land area in Williamsburg city, based on the U.S. Census Bureau's 2020 ZIP Code Tabulation Area to county relationship file.
Free checklist · PDF
Radon Test Checklist
A one-page, step-by-step checklist for running a home radon test right the first time, and what to do with the number.
- Short-term vs. long-term test: which to use
- Closed-house conditions and where to place the kit
- What 2, 4 and 8 pCi/L mean and when to fix
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