Topsham, ME Radon Mitigation and Testing

Q: What is the average radon level in Topsham, ME?

Based on 1 user-submitted tests, the average radon level is 3.00 pCi/L.

Q: What EPA Radon Zone is Topsham in?

Topsham is in Sagadahoc County, EPA Zone 2.

Q: How much does radon mitigation cost in Topsham?

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

Avg: 3.00 pCi/L

Sagadahoc County

EPA Zone 2

1 user test

Topsham in Sagadahoc County within the Portland Metro area shows an average radon level of 3.0 pCi/L, which falls within EPA recommended guidelines but still warrants homeowner attention. This Kennebec River community in zip code 04086 sits on marine clay deposits over granite bedrock that can produce variable radon conditions. The town's mix of historic shipbuilding-era homes and modern construction means testing remains important for all residents.

3.00

pCi/L average

Below EPA Action Level

Based on 1 user-submitted radon test for homes in Topsham, ME. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Topsham, ME Radon Mitigation

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

Topsham, ME Radon Testing

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

Topsham, Maine Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
3 pCi/L	Topsham, ME	51-99 Years	Full Basement	May 2022

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

Topsham Radon Facts

Key details about the radon risk profile for Topsham and the 04086 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Sagadahoc County, ME

Zip Code

04086

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

3.00 pCi/L

User Tests Submitted

Topsham and the 04086 zip code are located in Sagadahoc 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 Topsham, ME

What is the average radon level in Topsham, ME?

Based on 1 user-submitted test, the average radon level in Topsham is 3.00 pCi/L. This is below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.

What EPA Radon Zone is Topsham in?

Topsham and the 04086 zip code are in Sagadahoc 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 Topsham?

Radon mitigation in Topsham 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 Topsham?

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 Maine

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

City	Avg User Radon Level	Submissions
Rumford	5.67 pCi/L	3
York	8.50 pCi/L	2
Saco	7.50 pCi/L	2
Hampden	4.50 pCi/L	2
Scarborough	14.00 pCi/L	1
Kittery	12.00 pCi/L	1
South Portland	10.00 pCi/L	1
Portland	4.00 pCi/L	1