Watertown, MN Radon Levels

Q: What EPA Radon Zone is Watertown in?

Watertown is in Carver 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.

Check local Watertown radon levels and find certified testing and mitigation professionals to keep your home safe

Watertown, MN Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Carver County, MN

Zip Code 55388

Situated in Carver County southwest of Minneapolis-St. Paul, Watertown lies within Minnesota's glacial prairie region where radon levels can vary significantly. Testing data for zip code 55388 is currently limited, making individual home testing crucial for residents. The community's mix of suburban development and rural properties requires site-specific radon evaluation.

5.50

pCi/L area average

Above EPA Action Level

Carver County average: 5.50 pCi/L, based on 2 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Watertown itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Watertown, MN Radon Mitigation

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

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Radon Readings Near Watertown, MN

No homeowner tests have been submitted for Watertown yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Delano	5.6 mi	5.00 pCi/L	1
Mound	9.5 mi	6.00 pCi/L	1
Victoria	11.7 mi	4.00 pCi/L	1
Loretto	13.4 mi	6.00 pCi/L	1
Excelsior	13.8 mi	13.00 pCi/L	1
Buffalo	15.3 mi	11.00 pCi/L	1
Chaska	15.8 mi	7.00 pCi/L	1
Minnetonka	18.0 mi	5.00 pCi/L	1

Carver County Radon Profile

The bedrock and soils beneath Carver County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 2 cities in Carver County average 5.50 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Carver County.

Radon FAQ for Watertown, MN

What EPA Radon Zone is Watertown in?

Watertown and the 55388 zip code are in Carver 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.

Why are radon readings shown from areas near Watertown?

No homeowner radon tests have been submitted for Watertown yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Carver County average—are the best available indicator of local conditions until Watertown homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

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.