Located in Clay County in northwestern Iowa, Royal sits within EPA Zone 1 where glacial deposits over Cretaceous bedrock create high radon potential across the region. The agricultural community in zip code 51357 currently lacks specific testing data, but Iowa's statewide radon concerns make measurement essential. Homeowners should test their properties, especially those with basements common to Iowa's housing stock.
Royal, IA Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
Royal, IA Radon Testing
Finding qualified radon testing professionals is the first step toward protecting your home.
Royal Radon Facts
Key details about the radon risk profile for Royal and the 51357 zip code area.
EPA Radon Zone
Zone 1 — High Risk
County
Clay County, IA
Zip Code
51357
Predicted Screening Level
> 4.0 pCi/L (Zone 1)
Royal and the 51357 zip code are located in Clay County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.
Radon FAQ for Royal, IA
What EPA Radon Zone is Royal in?
Royal and the 51357 zip code are in Clay County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.
How much does radon mitigation cost in Royal?
Radon mitigation in Royal typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.
Should I test for radon if I'm buying a home in Royal?
Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.
Most Active Radon Markets in Iowa
Cities with the most user-submitted radon test data in the state.
