Local testing decision
Radon Testing in Washington County, UT
Washington County is a split-decision county. 13.8% of reported tests at or above 4.0 pCi/L, 2.2 pCi/L primary measured result, and 32.0 pCi/L high-end signal means a 2.0-3.9 pCi/L home result should be retested or tracked instead of dismissed.
Direct answer
Washington County is a retest-and-watch market, not a dismiss-it market.
Washington County is a split-decision county: no reading means test first, 2.0-3.9 means retest or track, and 4.0+ means cost planning starts.
Evidence
Official county measurements
Primary signal
2.2 pCi/L
Reported tests
715 reported tests
What this evidence can and cannot tell you
Washington County, UT has more than the EPA map: Utah DHHS EPHT exposes 715 reported tests, 2.2 pCi/L county average, 1.5 pCi/L median, 13.8% of reported tests at or above 4.0 pCi/L, and 32.0 pCi/L high-end signal for 2006-2019.
Washington County, UT is measurement-backed for 2006-2019. The measured average is 2.2 pCi/L, and 13.8% of reported results are at or above 4.0 pCi/L. The high-end signal reaches 32.0 pCi/L.
Your next test decision
No reading yet: start with a test kit; the county data is context, not a substitute for the home result.
Retest trigger: a 2.0-3.9 pCi/L home result is exactly the gray zone for this county; retest before ignoring it or paying for mitigation.
Move from a test result to a local plan
Use the result band, foundation type, and county cost range together. A county signal is context; the home's own test controls the decision.
Sources