Short answer: the median radon test in Lancaster County was 4.8 pCi/L (CDC, lab tests 2008 to 2017). That means at least half of the tested buildings were at or above EPA’s action level of 4 pCi/L.
How Lancaster County compares
Lancaster County’s median of 4.8 pCi/L ranks #18 of 67 Pennsylvania counties with CDC data. The middle Pennsylvania county median is 3.8 pCi/L, so Lancaster County is above the state’s typical county. EPA puts the county in Zone 1, the highest-potential zone on EPA’s map (predicted average indoor level above 4 pCi/L).
These numbers come from tests homeowners and buyers chose to run, not a random survey. They show local risk; they cannot predict the level in your house.
Certified radon mitigation pros based in Lancaster County
Each listing below appears on Pennsylvania DEP’s certified mitigation list dated September 1, 2026. We show the city on file and the DEP certification number so you can confirm it.
JK Mechanical Inc
Certified firm based in Willow Street, PA
PA DEP certified mitigationCertification #3748
RJH Radon Mitigation Inc
Certified firm based in Akron, PA
PA DEP certified mitigationCertification #0565
Andrew Fritsch
Certified individual based in Ephrata, PA
PA DEP certified mitigationCertification #3541
Brian Shimp
Listed with: Jk Mechanical INC
Certified individual based in Willow Street, PA
PA DEP certified mitigationCertification #3747
Elliot Hoffman
Listed with: Rjh Radon Mitigat (name cut short on the state list)
Certified individual based in Akron, PA
PA DEP certified mitigationCertification #3058
Certified firms in neighboring counties
- S. J. Watras, Inc. (Boyertown, Berks County)
- Safe Shelter Environmental (West Chester, Chester County)
- Enviroquest Inc (Harrisburg, Dauphin County)
- M Webster Construction Inc (Lebanon, Lebanon County)
- Absolute Radon Mitigation, LLC (York, York County)
Radon in counties next to Lancaster
| County | Median pCi/L | EPA zone |
|---|---|---|
| Cecil, MD | 1.9 | Zone 2 (moderate) |
| Harford, MD | 1.7 | Zone 1 (high) |
| Berks, PA | 4.3 | Zone 1 (high) |
| Chester, PA | 2.2 | Zone 1 (high) |
| Dauphin, PA | 4.8 | Zone 1 (high) |
| Lebanon, PA | 7.5 | Zone 1 (high) |
| York, PA | 5.4 | Zone 1 (high) |
What to do in Lancaster County
- Test your home. EPA recommends testing every home below the third floor, whatever the county average.
- Fix it at 4 pCi/L or higher. EPA also suggests considering a fix between 2 and 4 pCi/L.
- Use a certified pro. In Pennsylvania, radon mitigation for pay requires DEP certification. Check the number against the state list before you sign.
- Retest after the system is installed.
Sources
- County median radon levels and test counts: CDC Environmental Public Health Tracking Network, radon tests from labs, 10-year period 2008 to 2017 (ephtracking.cdc.gov).
- Radon zones: U.S. EPA Map of Radon Zones (epa.gov/radon).
- Certified mitigation firms and individuals: Pennsylvania DEP list of certified radon mitigation firms dated September 1, 2026 (PDF), checked October 24, 2026.
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