Watertown, SD Radon Mitigation and Testing

Q: What is the average radon level in Watertown, SD?

Based on 2 user-submitted tests, the average radon level is 6.00 pCi/L.

Q: What EPA Radon Zone is Watertown in?

Watertown is in Codington County, EPA Zone 1.

Q: How much does radon mitigation cost in Watertown?

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

Avg: 6.00 pCi/L

Codington County

EPA Zone 1

2 user tests

Found in Codington County in eastern South Dakota, Watertown shows an average radon level of 6.0 pCi/L, which exceeds the EPA action level of 4.0 pCi/L. Based on 2 tests in zip code 57201, readings have ranged from 4.0 to 8.0 pCi/L, indicating that mitigation may be necessary for many homes. The area's glacial till soils and basement foundations contribute to radon accumulation potential.

6.00

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Watertown, SD. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Watertown, SD Radon Mitigation

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

Watertown, SD Radon Testing

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

Watertown, South Dakota Radon Levels

User-submitted radon test readings from homes in the Watertown area.

Radon Level	City	Home Age	Foundation	Submitted
8 pCi/L	Watertown, SD	0-20 Years	Partial Basement	Mar 2020
4 pCi/L	Watertown, SD	0-20 Years	Full Basement	Nov 2015

Have a radon test result for Watertown? Submit your reading to help other homeowners.

Watertown Radon Facts

Key details about the radon risk profile for Watertown and the 57201 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Codington County, SD

Zip Code

57201

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

6.00 pCi/L

User Tests Submitted

Watertown and the 57201 zip code are located in Codington 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 Watertown, SD

What is the average radon level in Watertown, SD?

Based on 2 user-submitted tests, the average radon level in Watertown is 6.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Watertown in?

Watertown and the 57201 zip code are in Codington 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 Watertown?

Radon mitigation in Watertown 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 Watertown?

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