What Zone 1 means in Douglas County
The EPA recommends that every home in a Zone 1 county be tested, and that new homes be built with radon-resistant features.
The EPA's Map of Radon Zones (EPA-402-R-93-071) sorts all 3,143 US counties into three tiers by predicted indoor screening level. Douglas County sits in Zone 1. The classification is a planning assumption for builders, inspectors and buyers, and it is the figure a home inspector or realtor will cite for this county.
How Douglas County compares inside Nebraska
Of the 93 counties in Nebraska on the EPA map, 53 are Zone 1, 24 are Zone 2 and 16 are Zone 3. Douglas County is one of the 53 Nebraska counties classified Zone 1.
Why your own home still needs a test
Radon comes out of the soil and enters through the foundation, so two houses on the same street can read very differently depending on foundation cracks, soil contact and how the house is ventilated. A Zone 1 classification tells you the county's planning assumption, not your reading. A short-term test kit costs about $15 to $30 and settles it. Many state radon programs also offer free or low-cost kits.
ZIP codes in Douglas County
68007, 68010, 68022, 68064, 68069, 68101, 68102, 68103, 68104, 68105, 68106, 68107, 68108, 68109, 68110, 68111, 68112, 68114, 68116, 68117, 68118, 68119, 68120, 68122, 68124, 68127, 68130, 68131, 68132, 68134, 68135, 68137, 68139, 68142, 68144, 68145, 68152, 68154, 68155, 68164, 68172, 68175, 68176, 68178, 68179, 68180, 68182, 68183, 68197, 68198
Get the full dossier for your ZIP
The $9 Douglas County radon report gives you the county's EPA zone, the expected indoor average, your home's estimated likelihood of testing above the 4 pCi/L action level adjusted for basement and home type, the mitigation cost band, and the EPA lifetime-risk figures, on one printable page you can hand to a buyer's inspector.
Related reading
- What EPA Zones 1, 2 and 3 actually mean
- How to test your home for radon yourself
- How radon mitigation systems work, and what they cost
- Selling a home with high radon
- Radon zones for other counties
Source
Zone classification: US EPA Map of Radon Zones, county table (EPA-402-R-93-071 / EPA 402/A-16/001). Population: US Census Bureau county population estimates, 2024 vintage. This page reports the EPA's own classification for Douglas County exactly as published. We do not interpolate or adjust it.