Pennsylvania Radon Map, Levels & Testing Guide
Browse the 50 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.
High Risk
Moderate
Low Risk
Official Evidence in Pennsylvania
50 of 50 listed counties have official evidence
Open a county page to see the processed verdict: source confidence, local burden, state percentile, and the next step for no reading, 2.0-3.9, or 4.0+ pCi/L.
100%
covered
Measured
50
State source
50
CDC source
0
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.
50
measured counties
State-level verdict
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 50 visible county measurement rows. 48 counties cross the high measured-burden band, so those pages should answer testing and 4.0+ action questions most directly.
First-click counties
Open Perry County first when you need the strongest local answer. It is tagged Test-now from n/a 4.0+ - 17.1 pCi/L primary - 5,211 tests. 49 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.
Perry County
PA DEP
n/a 4.0+ - 17.1 pCi/L primary - 5,211 tests
Perry County is a first-click page: n/a of reported tests at or above 4.0 and 17.1 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Schuylkill County
PA DEP
n/a 4.0+ - 13.9 pCi/L primary - 14,670 tests
Schuylkill County is a first-click page: n/a of reported tests at or above 4.0 and 13.9 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Lebanon County
PA DEP
n/a 4.0+ - 13.0 pCi/L primary - 25,735 tests
Lebanon County is a first-click page: n/a of reported tests at or above 4.0 and 13.0 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Mifflin County
PA DEP
n/a 4.0+ - 13.4 pCi/L primary - 3,489 tests
Mifflin County is a first-click page: n/a of reported tests at or above 4.0 and 13.4 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
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 50 visible counties with measurement tables, 48 land in the high measured-burden band and 49 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
5 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 confidence
All measured rows shown here use state-specific official sources, so this hub can make source-backed county comparisons without leaning on a national fallback.
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 ->