Williamsburg, VA Radon Mitigation and Testing

Q: What is the average radon level in Williamsburg, VA?

Based on 4 user-submitted tests, the average radon level is 5.80 pCi/L.

Q: What EPA Radon Zone is Williamsburg in?

Williamsburg is in Williamsburg City County, EPA Zone Unknown.

Q: How much does radon mitigation cost in Williamsburg?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Avg: 5.80 pCi/L

Williamsburg City County

EPA Zone Unknown

4 user tests

Williamsburg is located in Williamsburg City County, Virginia. With 4 user-submitted readings averaging 5.80 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 23185 zip code.

5.80

pCi/L average

Above EPA Action Level

Based on 4 user-submitted radon tests for homes in Williamsburg, VA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Williamsburg, VA Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Williamsburg, VA Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Williamsburg, Virginia Radon Levels

User-submitted radon test readings from homes in the Williamsburg area.

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Williamsburg, VA	0-20 Years	Full Basement	Apr 2025
5 pCi/L	Williamsburg, VA	0-20 Years	Full Basement	Mar 2025
6 pCi/L	Williamsburg, VA	0-20 Years	Full Basement	Mar 2017

Have a radon test result for Williamsburg? Submit your reading to help other homeowners.

Williamsburg Radon Facts

Key details about the radon risk profile for Williamsburg and the 23185 zip code area.

EPA Radon Zone

Unknown

County

Williamsburg City County, VA

Zip Code

23185

Predicted Screening Level

Unknown

Avg. User Submitted Level

5.80 pCi/L

User Tests Submitted

Williamsburg and the 23185 zip code are located in Williamsburg City County, which has an EPA assigned Radon Zone of Unknown. A radon zone of Unknown does not have sufficient data for classification. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Williamsburg, VA

What is the average radon level in Williamsburg, VA?

Based on 4 user-submitted tests, the average radon level in Williamsburg is 5.80 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Williamsburg in?

Williamsburg and the 23185 zip code are in Williamsburg City County, which has an EPA assigned Radon Zone of Unknown. A zone of Unknown does not have sufficient data for classification.

How much does radon mitigation cost in Williamsburg?

Radon mitigation in Williamsburg typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Williamsburg?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in Virginia

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Fredericksburg	7.29 pCi/L	7
King George	7.17 pCi/L	6
Leesburg	9.80 pCi/L	5
Chantilly	9.60 pCi/L	5
Fancy Gap	9.40 pCi/L	5
Purcellville	10.75 pCi/L	4
Aldie	8.00 pCi/L	4
Front Royal	7.75 pCi/L	4
Bristol	7.50 pCi/L	4
Winchester	7.00 pCi/L	4
Williamsburg	5.75 pCi/L	4
Lovettsville	5.25 pCi/L	4
Woodbridge	4.50 pCi/L	4
Fairfax	9.67 pCi/L	3
Stafford	9.33 pCi/L	3
Louisa	8.33 pCi/L	3
Linden	7.67 pCi/L	3
Warrenton	7.67 pCi/L	3
Burke	5.67 pCi/L	3
Lynchburg	5.33 pCi/L	3