Data, sources and guides
Radon Sources and Resources for York County
Every radon number on this site comes from Pennsylvania DEP records, and every health or legal statement points back to a public source. Radon Mitigation York is a PA DEP-certified radon mitigation firm (PA DEP Cert #3241) at 805 E Prospect St, York, PA 17403. Our own crew tests, installs and services every system.
Checked October 21, 2026
Sources Behind This Site
Grouped by what they support. Each entry says exactly which claims on this site rely on it.
York County radon data
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Every basement and first-floor test figure for York County, its towns and York ZIP codes.
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York County system costs, system types and before and after radon levels.
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Pennsylvania DEP
Radon Services Directory (certified testers, mitigators and labs by county) (opens in a new tab)The certified mitigator and tester list for York and neighboring counties.
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York County as EPA Radon Zone 1, the highest predicted indoor radon potential.
Pennsylvania rules and programs
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Pennsylvania DEP
Radon Division (hotline 800-237-2366) (opens in a new tab)Pennsylvania radon program, certification and the state radon hotline.
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Pennsylvania Code
25 Pa. Code Chapter 240, Radon Certification (opens in a new tab)The requirement that anyone who tests or mitigates radon for hire is DEP certified.
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Pennsylvania Office of Attorney General
Home Improvement Contractor registration search (opens in a new tab)HICPA contractor registration, written contracts and the right to cancel.
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Pennsylvania General Assembly
Real Estate Seller Disclosure Law, 68 Pa.C.S. Chapter 73
What sellers must disclose about known radon results and systems.
Health research
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Radon as the second leading cause of lung cancer, and the 4.0 pCi/L action level.
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How radon forms and why lowering indoor levels reduces lung cancer risk.
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American Cancer Society
Radon and Cancer (opens in a new tab)Lung cancer risk from radon exposure.
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World Health Organization
Radon and health (fact sheet) (opens in a new tab)International guidance that no radon level is free of risk.
Testing and mitigation guidance
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How sub-slab depressurization works and what to expect from a mitigator.
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Short-term and long-term testing, and radon in real estate transactions.
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Industry standards for system design, fan placement, labeling and discharge height.
Geology
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U.S. Geological Survey
The Geology of Radon (opens in a new tab)How uranium in rock and soil produces radon, and why geology shapes local levels.
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Pennsylvania DCNR
Bureau of Geological Survey (opens in a new tab)Pennsylvania bedrock geology, including the Piedmont rocks under York County.
Local government
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City of York
City of York, Pennsylvania (opens in a new tab)City permits and codes, for electrical work on a radon fan inside city limits.
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York County
York County, Pennsylvania (opens in a new tab)County offices and links to the townships and boroughs that handle local permits.
Dataset notes from DEP: Source: Pennsylvania DEP, Radon Test Results / Radon Mitigation System records (data.pa.gov). Retrieved October 21, 2026. Tests reported to DEP by certified labs and testers, not a random sample of homes.
Method
How We Use the Data
- York County test figures come from the PA DEP Radon Test Results dataset. Town = mailing-address municipality in the DEP data. Basement figures use 'BASEMENT' floor level only. Mitigation figures use post-mitigation records from 2024–2026 (county) or 2022–2026 (town).
- A town is the mailing-address town in the DEP data, so it includes surrounding townships that share that post office. City of York neighborhoods use the ZIP code they fall in, because DEP files York-area tests by ZIP, not by neighborhood.
- These are tests reported to DEP by certified labs and testers, not a random sample of homes, so any single house can test higher or lower.
- Percentages and pCi/L values are rounded to one decimal place, and costs to whole dollars. No figure is estimated or taken from anywhere else.
York County help
Local Radon Contacts
- Pennsylvania radon hotline (DEP)
- 800-237-2366
- PA DEP Radon Division
- 717-783-3594
- Local electrical permits for a radon fan
- Your township or borough, or the City of York inside city limits
Looking for someone to do the work? Check our certification and any other firm in the PA DEP Radon Services Directory, or request a free estimate from our certified crew.
On this site
York County Radon Guides
Radon data by town
Start with radon levels in York County, then open a town page.
- Hanover
- Dillsburg
- Red Lion
- Dover
- Etters
- Stewartstown
- Spring Grove
- New Freedom
- Dallastown
- Shrewsbury
- Glen Rock
- Seven Valleys
City of York neighborhoods
Guides
- PA DEP Radon Services Directory
- How our mitigation process works
- 7 Best Radon Mitigation Companies in York, PA (2026)
- Selling Fast in York's 2026 Housing Market? Don't Skip the Radon Test
- Why Fall Is the Best Time to Test for Radon in York, PA
- How Sub-Slab Radon Mitigation Works in York Homes
- Radon Testing When Buying or Selling a Home in York, PA
- Radon Levels in York County, PA: What Homeowners Should Know
Radon services
Free estimates · PA DEP-certified radon mitigation firm
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