Pacific County, WA Radon Zone Data

Pacific County, WA: EPA's radon zone, explained

EPA places Pacific County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Pacific County lands in the 15th percentile for radon potential.

Pacific County by the numbers

Pacific County, Washington is home to about 24,245 people across 933.374 square miles. Averaged across its land area, Pacific County runs about 26 people per square mile. By population, Pacific County is the 549th largest of every county sharing its EPA zone — the 47th percentile by population within that zone. EPA's geology-based Region 10 groups Pacific County with 141 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Pacific County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Pacific County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Pacific County

For a Pacific County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Washington's state radon program

For Pacific County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Pacific County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Pacific County's figures come from

Pacific County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.