Local radon guide
Radon Mitigation in Dallastown, PA
Dallastown has the highest share of elevated basement radon readings among the town pages on this site. Of 1,968 basement radon tests from homes with a Dallastown mailing address reported to the Pennsylvania DEP, 68.6% came in at or above 4.0 pCi/L, with a median of 8.4 pCi/L. That is well above the York County share of 56.5%, so testing your own home is the only way to know your number.
Source: Pennsylvania DEP, Radon Test Results (data.pa.gov), tests through July 2026. Retrieved September 30, 2026. These are tests reported to DEP by certified labs and testers, not a random sample of homes.
Dallastown radon test results
| Measure | Dallastown | York County |
|---|---|---|
| Basement tests | 1,968 | 81,840 |
| Median basement result | 8.4 pCi/L | 4.9 pCi/L |
| At or above 4.0 pCi/L | 68.6% | 56.5% |
| At or above 10 pCi/L | 45.0% | 29.4% |
| At or above 20 pCi/L | 24.6% | 14.6% |
The Dallastown mailing address includes surrounding townships that share its post office, so these numbers reflect more than the borough alone. They are tests reported to DEP, not a random sample of homes.
Source: Pennsylvania DEP, Radon Test Results (data.pa.gov), tests through July 2026. Retrieved September 30, 2026. These are tests reported to DEP by certified labs and testers, not a random sample of homes.
Radon mitigation cost in Dallastown
Dallastown has too few reported systems to quote a town-specific median, so the county figure is the best benchmark here. Across York County, homeowners paid a median of $1,150 for a mitigation system from 2024 to 2026, and most jobs cost $935 to $1,320.
Source: Pennsylvania DEP, Radon Mitigation System records (data.pa.gov), York County systems reported 2024–2026. Retrieved September 30, 2026.
For the full breakdown by system type and town, see our radon mitigation cost page.
How mitigation works in Dallastown homes
Most York County systems are sub-slab depressurization: a suction point under the slab, PVC pipe, and an inline fan that vents soil gas above the roofline. Because Dallastown's readings run so high, confirming the system brings your number down with a follow-up test matters more here than in lower-reading towns.
Across York County systems reported to DEP, the median radon level fell from 12 pCi/L before mitigation to 1.0 pCi/L after, and 97.4% of systems tested below 4.0 afterward. See how the systems work.
Hiring a certified mitigator for your Dallastown home
Pennsylvania requires DEP certification for anyone performing radon testing or mitigation for hire. The PA DEP Radon Services Directory is the place to confirm a company is certified for mitigation specifically, since some firms advertise radon services without that credential.
Ask for a written scope, a fan warranty, and a post-mitigation test. Our hiring guide lists every question worth asking before you sign.
Nearby
Looking at a nearby community? See Red Lion and York.
See all York County towns and back to our York radon mitigation guide.
Learn more about the community on the Dallastown, Pennsylvania Wikipedia page.
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Contact Us
York PA Radon Guide
17 E Market St., Suite C, York, PA 17401
Phone: 717-714-3297
Our team is based in downtown York, PA and helps local homeowners understand radon testing, mitigation, and hiring certified help. Always verify individual contractor certifications directly with the PA DEP.
Next steps for York, PA homeowners
- 1
Test if you have not already. A short-term kit or a professional test is the starting point, not a guess based on your neighbor's result.
- 2
Confirm your result. Know your actual number before deciding on next steps.
- 3
If elevated, contact PA DEP-certified mitigators. Use the state directory, not a general contractor search.
- 4
Retest after work is completed. A finished install should come with a follow-up test that confirms the fix actually worked.