RV
RadonVerdict

County evidence note

Radon zone and test data for Ulster County, NY

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

Ulster County is elevated enough that map-reading should turn into a home test.

Ulster County, NY is measurement-backed for 2015-2019. The measured average is 3.8 pCi/L, and 24.4% of reported results are at or above 4.0 pCi/L. The high-end signal reaches 22.0 pCi/L.

Source hierarchy: NY DOH is used for this county, with EPA zone and Census housing data kept as supporting context. NY DOH values are submitted residential tests; higher testing participation can make the volume signal especially useful for local context.

EPA map zone: Zone 1

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

Source: New York State Department of Health Residential Radon Test Data

Coverage: 2015-2019 ยท retrieved 2026-05-05

Open the original source

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 Ulster County

Reported average3.8 pCi/L
At or above 4.024.4%
Source test volume26.2 avg/year
Comparison cohort62

NY DOH values are submitted residential tests; higher testing participation can make the volume signal especially useful for local context.

Nearby comparison: Closest counties by share of tests at or above 4.0 pCi/L: Oswego County (24.4%) is just lower, and Washington County (25.0%) is just higher.

Intent-matched guide

Open the page that answers the actual search

How to test in Ulster 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