Radon Levels in Mission, KS
Mission is in Johnson County. Radon data is tracked at the county level by the EPA and CDC.
EPA predicts average indoor levels above 4 pCi/L in this county · Source: EPA, CDC
Tipper's take on radon in Mission
Mission sits in Johnson County, which the EPA classifies as Zone 1, the highest risk category. That means the agency's geological and indoor measurement data predicts average indoor radon levels above 4 pCi/L across the county. The CDC doesn't have enough test data from Johnson County to calculate a reliable average. That means testing your own home is the only way to know.
Zone 1 doesn't mean every home in Mission is over the limit. Radon varies house to house depending on foundation type, soil composition, and how the home is sealed. The county-level signal is strong enough that Tipper considers testing essential here.
A basic test kit costs about $15, takes 48 hours, and settles the question. If your home is below 4 pCi/L, you're good. If it's above, a mitigation system typically costs $800–$2,000 in Kansas and brings levels down reliably.
Sources: EPA Radon Zone Map
Test Your Home in Mission
A short-term test kit costs about $15, includes the lab fee, and gives you a result in 48 hours. It's the only way to know your home's actual radon level.
Radon Professionals Serving Kansas
No contractors in our directory are listed specifically for Mission. These certified pros serve Kansas and may cover your area.
Full County Data
Radon data is tracked at the county level. For state comparisons, nearby counties, and detailed analysis, see the full county page.
Johnson County, KS: Full Radon Data →Radon FAQ: Mission, KS
What is the radon risk in Mission?
Mission is in Johnson County, which the EPA classifies as Zone 1 (High risk). The EPA recommends testing every home regardless of zone. Radon levels vary house to house.
How do I test my home in Mission for radon?
Place a short-term radon test kit in the lowest livable level of your home for 48 hours under closed-house conditions. Kits cost about $15 and include the lab fee. Keep windows and exterior doors closed during the test (normal entry/exit is fine). Results come back in about a week.
What should I do if radon is high in my Mission home?
If your test result is at or above 4 pCi/L, the EPA recommends installing a mitigation system. A certified contractor can install one for $800–$2,000 in most cases. The system runs continuously and typically brings levels well below 2 pCi/L. Retest after installation to confirm.
Does Zone 1 mean every home in Mission has high radon?
No. Zone 1 means the county-level prediction is above 4 pCi/L on average, but individual homes vary widely. Foundation type, soil conditions, and ventilation all matter. Some Zone 1 homes test below 2 pCi/L. The zone tells you to take it seriously. Your test tells you what to do.