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RadonVerdict

County evidence note

Radon zone and test data for Broomfield County, CO

County data can show why testing matters. It cannot tell you the radon level in a particular house. The only property-level answer comes from a valid test.

What the source supports

Broomfield County crosses the action threshold in the official county data.

Broomfield County, CO is measurement-backed for 2005-2024. The measured average is 3.2 pCi/L, and 44.3% of reported results are at or above 4.0 pCi/L. The high-end signal reaches 205.0 pCi/L.

Source hierarchy: Colorado Department of Public Health and Environment is used for this county, with EPA zone and Census housing data kept as supporting context. Colorado values are pre-mitigation test results, so they are strongest as a problem-finding signal and should not be read as post-repair household averages.

EPA map zone: Zone 1

The EPA map predicts broad county potential; it is not a measurement for an address.

Source: Colorado Environmental Public Health Tracking Pre-Mitigation Radon Test Results

Coverage: 2005-2024 ยท retrieved 2026-05-05

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What to do with this information

  1. 1. Test the homeUse a valid device and record duration, placement, and conditions.
  2. 2. Interpret the resultTreat 4.0 pCi/L as the main action threshold and preserve the testing context.
  3. 3. Use qualified helpFor testing or mitigation, use state requirements and recognized proficiency programs.

Evidence profile for Broomfield County

Reported average3.2 pCi/L
At or above 4.044.3%
Source test volume207.9 avg/year
Comparison cohort64

Colorado values are pre-mitigation test results, so they are strongest as a problem-finding signal and should not be read as post-repair household averages.

Nearby comparison: Closest counties by share of tests at or above 4.0 pCi/L: Grand County (44.1%) is just lower, and Custer County (44.7%) is just higher.

Intent-matched guide

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How to test in Broomfield County

Editorial and Data Transparency

Author
RadonVerdict (Independent public-data software project)
Evidence Review
Official and primary sources cited below
Data Retrieved At
2026-02-24

Primary Sources