Texas Radon Map, Levels & Testing Guide
Browse the 254 listed county pages surfaced for Texas. 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 Texas
254 of 254 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
254
State source
0
CDC source
254
Needs source detail
0
Measured Risk Leaders in Texas
County rankings from actual reported radon tests
These lists rank the visible Texas 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.
254
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 254 visible county measurement rows. 27 counties cross the high measured-burden band, so those pages should answer testing and 4.0+ action questions most directly.
First-click counties
Open Carson County first when you need the strongest local answer. It is tagged Test-now from 100.0% 4.0+ - 36.2 pCi/L primary - 1 tests. 36 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 254 CDC-backed 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.
Carson County
CDC Tracking
100.0% 4.0+ - 36.2 pCi/L primary - 1 tests
Carson County is a first-click page: 100.0% of reported tests at or above 4.0 and 36.2 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Burnet County
CDC Tracking
71.4% 4.0+ - 37.6 pCi/L primary - 4 tests
Burnet County is a first-click page: 71.4% of reported tests at or above 4.0 and 37.6 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Polk County
CDC Tracking
100.0% 4.0+ - 25.5 pCi/L primary - 1 tests
Polk County is a first-click page: 100.0% of reported tests at or above 4.0 and 25.5 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Randall County
CDC Tracking
69.0% 4.0+ - 17.8 pCi/L primary - 58 tests
Randall County is a first-click page: 69.0% of reported tests at or above 4.0 and 17.8 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 36.2 pCi/L - high-end 61.2 pCi/L
CDC Tracking
Primary result 12.6 pCi/L - high-end 12.6 pCi/L
CDC Tracking
Primary result 4.2 pCi/L - high-end 4.2 pCi/L
CDC Tracking
Primary result 4.0 pCi/L - high-end 4.0 pCi/L
CDC Tracking
Primary result 5.0 pCi/L - high-end 5.0 pCi/L
CDC Tracking
Highest high-end reading
4.0+ share 8.4% - primary result 12.5 pCi/L
CDC Tracking
4.0+ share 9.2% - primary result 3.4 pCi/L
CDC Tracking
4.0+ share 69.0% - primary result 17.8 pCi/L
CDC Tracking
4.0+ share 55.7% - primary result 7.3 pCi/L
CDC Tracking
4.0+ share 71.4% - primary result 37.6 pCi/L
CDC Tracking
Most reported tests
4.0+ share 8.4% - primary result 12.5 pCi/L
CDC Tracking
4.0+ share 2.9% - primary result 0.8 pCi/L
CDC Tracking
4.0+ share 9.2% - primary result 3.4 pCi/L
CDC Tracking
4.0+ share 13.0% - primary result 1.9 pCi/L
CDC Tracking
4.0+ share 7.6% - primary result 1.8 pCi/L
CDC Tracking
Measured pattern
Among 254 visible counties with measurement tables, 27 land in the high measured-burden band and 36 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
36 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
The measured rows shown here use CDC Tracking. This is still official evidence, but the hub should keep source caveats visible until a stable state table is available.
Already Tested
View Texas 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
Texas 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 note
Texas does not have specific radon disclosure requirements. Most Texas counties are in EPA Zone 3 (low risk), but isolated areas can have elevated readings.
Credential note
Texas does not require state licensing for radon professionals.
Already tested? Get your itemized mitigation cost estimate.
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