Delaware County, OK Radon Zone Data

Delaware County, OK radon potential

EPA places Delaware County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 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 Delaware County lands in the 53rd percentile for radon potential.

Where Delaware County sits nationally

Delaware County, Oklahoma is home to about 41,771 people across 737.751 square miles. Population density there runs about 57 people per square mile. Within its own EPA zone, Delaware County is bigger by population than 62% of the counties that share it. Geologically, Delaware County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Delaware County

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Delaware County's Zone 2 prediction. Middle-of-the-pack doesn't mean risk-free for any one Delaware County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Delaware County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Oklahoma's state radon program

For Delaware County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Delaware 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 Delaware 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.