What EPA's radon map says about Snyder County

Snyder County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Snyder County ranks higher in radon potential than 88% of rated counties (the 88th percentile).

Where Snyder County sits nationally

About 39,627 people live in Snyder County, Pennsylvania, spread over 328.784 square miles. Averaged across its land area, Snyder County runs about 121 people per square mile. Among counties sharing Snyder County's EPA zone, it outranks 64% of them by population. Geologically, Snyder County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

Zone vs. an actual test

Snyder County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. That doesn't mean every Snyder County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

If Snyder County tests above the action level

Mitigation cost doesn't depend on Snyder County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Pennsylvania's state radon program

Snyder County's test kit answers today; a Airthings radon monitor keeps answering for Snyder County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Snyder 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.