Agar, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is Agar in?

Agar is in Sully County, EPA Zone 1.

Q: How much does radon mitigation cost in Agar?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Sully County

EPA Zone 1

Agar sits in Sully County in central South Dakota, where glacial till deposits over sedimentary bedrock create conditions conducive to radon accumulation. While specific testing data for zip code 57520 is currently unavailable, the region's geological characteristics warrant homeowner vigilance. Rural properties with basements or crawl spaces should be tested regularly, as South Dakota's glacial soils can produce varying radon levels even within small communities.

Agar, SD Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Agar, SD Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Agar Radon Facts

Key details about the radon risk profile for Agar and the 57520 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Sully County, SD

Zip Code

57520

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Agar and the 57520 zip code are located in Sully 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 Agar, SD

What EPA Radon Zone is Agar in?

Agar and the 57520 zip code are in Sully 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 Agar?

Radon mitigation in Agar 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 Agar?

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 South Dakota

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Spearfish	7.75 pCi/L	4
Rapid City	10.50 pCi/L	2
Aberdeen	8.50 pCi/L	2
Sioux Falls	6.00 pCi/L	2
Watertown	6.00 pCi/L	2