Pennsylvania Radon Map, Levels & Testing Guide
Browse the 67 listed county pages surfaced for Pennsylvania. Open a listed county to compare its EPA zone, source caveats, testing meaning, and when mitigation pricing becomes worth checking.
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Official Evidence in Pennsylvania
67 of 67 listed counties have official evidence
Open a county page to see the official source context: measurement fields, local burden, state percentile, and the next step for no reading, 2.0-3.9, or 4.0+ pCi/L.
100%
covered
Measured
67
State source
50
CDC source
17
Needs source detail
0
Measured Risk Leaders in Pennsylvania
County rankings from actual reported radon tests
These lists rank the visible Pennsylvania county pages by measured radon signals, not by the EPA zone label alone. Use them to spot where the state hub has a real data story before opening individual county pages.
67
measured counties
State-level evidence read
This hub has measured high-burden counties, so the first click should be evidence-led.
The state hub is now doing a decision job: it separates first-click counties, retest counties, and lower-signal counties from 67 visible county measurement rows. 64 counties cross the high measured-burden band, so those pages should answer testing and 4.0+ action questions most directly.
First-click counties
Open Forest County first when you need the strongest local answer. It is tagged Test-now from 44.7% 4.0+ - 19.8 pCi/L primary - 37 tests. 65 visible measured counties are elevated or high enough to review before lower-signal counties.
Buyer/seller lane
Buyer/seller lane: start with the elevated or high counties, require a fresh lowest-level test, and turn any 4.0+ property result into quote or credit math. The hub has 50 state-source county rows to support that routing.
Retest lane
Retest lane: 2.0-3.9 pCi/L deserves more caution in the elevated/high county set than in lower-signal counties. The hub should send those users to county pages before product or cost paths.
Best county pages to open first
Start with these local evidence pages
Ranked by measured burden, 4.0+ share, test volume, and whether the EPA zone understates the measurement signal.
Forest County
CDC Tracking
44.7% 4.0+ - 19.8 pCi/L primary - 37 tests
Forest County is a first-click page: 44.7% of reported tests at or above 4.0 and 19.8 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Fulton County
CDC Tracking
69.7% 4.0+ - 16.2 pCi/L primary - 90 tests
Fulton County is a first-click page: 69.7% of reported tests at or above 4.0 and 16.2 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Montour County
CDC Tracking
61.6% 4.0+ - 16.1 pCi/L primary - 165 tests
Montour County is a first-click page: 61.6% of reported tests at or above 4.0 and 16.1 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Potter County
CDC Tracking
52.1% 4.0+ - 14.1 pCi/L primary - 138 tests
Potter County is a first-click page: 52.1% of reported tests at or above 4.0 and 14.1 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Highest 4.0+ share
Primary result 16.2 pCi/L - high-end 114.2 pCi/L
CDC Tracking
Primary result 16.1 pCi/L - high-end 189.6 pCi/L
CDC Tracking
Primary result 10.9 pCi/L - high-end 261.4 pCi/L
CDC Tracking
Primary result 10.8 pCi/L - high-end 238.0 pCi/L
CDC Tracking
Primary result 14.1 pCi/L - high-end 534.3 pCi/L
CDC Tracking
Highest high-end reading
4.0+ share n/a - primary result 6.0 pCi/L
PA DEP
4.0+ share n/a - primary result 10.5 pCi/L
PA DEP
4.0+ share n/a - primary result 11.0 pCi/L
PA DEP
4.0+ share n/a - primary result 9.3 pCi/L
PA DEP
4.0+ share n/a - primary result 4.7 pCi/L
PA DEP
Most reported tests
4.0+ share n/a - primary result 5.2 pCi/L
PA DEP
4.0+ share n/a - primary result 4.0 pCi/L
PA DEP
4.0+ share n/a - primary result 5.9 pCi/L
PA DEP
4.0+ share n/a - primary result 4.8 pCi/L
PA DEP
4.0+ share n/a - primary result 10.4 pCi/L
PA DEP
Measured pattern
Among 67 visible counties with measurement tables, 64 land in the high measured-burden band and 65 land in high or elevated measured-burden bands. That lets this hub rank counties by observed test distribution instead of repeating the EPA map.
Map vs measurements
17 elevated measured counties are not EPA Zone 1. Those are the pages where the actual test distribution matters more than a map-only answer.
Source strategy
50 measured counties use state-specific sources and 17 use CDC Tracking. State-specific sources carry the clearest local context; CDC rows remain useful but need peer comparison and home-test decision framing.
Already Tested
View Pennsylvania Cost Estimates
If you already have a radon result, skip the directory and move straight to local price guidance.
Understand the Number
2.0 vs 4.0 vs 8.0 pCi/L
Use the parent levels guide if you need the plain-English meaning of a radon result before browsing counties.
Need a Number First
Read the Testing Guide
Use the fastest valid radon test setup before you compare quotes or ask whether mitigation is worth it.
Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Official State Resource
Pennsylvania radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure rule tracked
Pennsylvania requires radon disclosure through the Seller's Property Disclosure Statement. The PA DEP also provides radon-specific guidance for real estate transactions.
State licensing required
Pennsylvania requires certification for radon testing and mitigation professionals through the PA DEP.
Already tested? Get your itemized mitigation cost estimate.
View Pennsylvania Mitigation Cost Estimates ->