Venango County, PA: EPA's radon zone, explained

EPA places Venango County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 90th percentile for radon potential — Venango County outranks 90% of every county EPA has rated.

Where Venango County sits nationally

Venango County, Pennsylvania is home to about 49,476 people across 674.265 square miles. Averaged across its land area, Venango County runs about 73 people per square mile. By population, Venango County is the 315th largest of every county sharing its EPA zone — the 70th percentile by population within that zone. EPA's geology-based Region 3 groups Venango County with 244 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Venango County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Venango County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. That doesn't mean every Venango 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 Venango County tests above the action level

For a Venango 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 Pennsylvania's state radon program

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

Where Venango County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.