Ralph, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is Ralph in?

Ralph is in Harding County, EPA Zone 2.

Q: How much does radon mitigation cost in Ralph?

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

Harding County

EPA Zone 2

Ralph, SD resides in Harding County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. Testing is recommended for all homes in the 57650 zip code area.

Ralph, SD Radon Mitigation

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

Ralph, SD Radon Testing

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

Ralph Radon Facts

Key details about the radon risk profile for Ralph and the 57650 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Harding County, SD

Zip Code

57650

Predicted Screening Level

2–4 pCi/L (Zone 2)

Ralph and the 57650 zip code are located in Harding County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Ralph, SD

What EPA Radon Zone is Ralph in?

Ralph and the 57650 zip code are in Harding County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in Ralph?

Radon mitigation in Ralph 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 Ralph?

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