Radon in Calvert County, Maryland
Last updated
Calvert County is one of 8 Maryland counties (out of 24) that EPA places in Zone 1. 14 ZIP codes reach into the county, 10 of them entirely.
What the zone means for a Calvert County home
Zone 1 means EPA predicted an average indoor screening level above 4 pCi/L for Calvert County as a whole, the level at which EPA says to fix a home. High readings are common here, so a test is especially worthwhile, and new homes in Calvert County are good candidates for radon-resistant construction.
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 Calvert County
We have not added Maryland professionals yet. Until we do, use the Maryland radon program at health.maryland.gov/phpa/OEHFP/EH/pages/radon.aspx, or the national certification boards: the NRPP pro search and NRSB find a pro. Or ask for free quotes below.
Free, no obligation
Get radon quotes from certified pros in Calvert County
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.
We only share your request with radon professionals for this job. We do not sell your details to anyone else. Radon by ZIP may be paid by professionals for leads or featured placement.
ZIP codes in Calvert County
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 Calvert County.
Maryland radon program
EPA lists the Maryland radon program (phone 410-537-3193) as the state contact. State programs can tell you about local test results, discounted kits, disclosure rules for home sales and credentialed professionals. Website: health.maryland.gov/phpa/OEHFP/EH/pages/radon.aspx.
Back to all Maryland counties.
Frequently asked questions
What is the EPA radon zone for Calvert County, Maryland?
EPA's Map of Radon Zones puts Calvert County in Zone 1 (highest potential): Predicted average indoor screening level above 4 pCi/L.
Do I need to test for radon in Calvert County 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 Calvert County?
Ask the Maryland radon program 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 Calvert County?
14 ZIP codes have at least part of their land area in Calvert County, 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
Free. We email you the download link, plus an occasional plain-English guide. Unsubscribe any time. We never sell your email. Privacy