Radon Mitigation in Plymouth, MN
Plymouth sits in Hennepin County in Minnesota's glacial-till lowlands. Minnesota's statewide indoor radon average is 4.4 pCi/L — well above the EPA action level of 4.0 pCi/L and the U.S. average of 1.3 pCi/L. With glacial-till lowlands geology and full-basement housing common in Plymouth, EPA and Minnesota health officials recommend every home be tested. If your test is 4.0 pCi/L or higher, mitigation is recommended; levels between 2 and 4 pCi/L are also worth addressing given Minnesota's elevated background radon.
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Who provides radon mitigation in Plymouth, MN?
Minnesota Radon Experts connects Plymouth homeowners with NRPP-certified radon mitigation specialists serving Hennepin County. Plymouth averages 4.4 pCi/L — above the EPA action level of 4.0 — so testing and mitigation are routed to a qualified local partner, typically within hours. Free quote within 24 hours. Call (612) 605-9118.
Why Do Plymouth Homes Have Elevated Radon?
Plymouth sits in Hennepin County in Minnesota's glacial-till lowlands. Minnesota's statewide indoor radon average is 4.4 pCi/L — well above the EPA action level of 4.0 pCi/L and the U.S. average of 1.3 pCi/L. With glacial-till lowlands geology and full-basement housing common in Plymouth, EPA and Minnesota health officials recommend every home be tested. If your test is 4.0 pCi/L or higher, mitigation is recommended; levels between 2 and 4 pCi/L are also worth addressing given Minnesota's elevated background radon.
Geology: Cold Minnesota winters intensify the stack effect — heated indoor air rising creates negative pressure that pulls radon-laden soil gas into basements. Winter radon readings commonly run 30–50% higher than summer.
Permits: Minnesota does not require a permit for residential radon mitigation, but Minnesota's Radon Awareness Act (Minn. Stat. §144.496) mandates disclosure at sale; MDH licenses radon professionals. Post-mitigation verification testing is recommended within 30 days of activation.
Neighborhoods we serve in Plymouth: Bass Lake, Greenwood.
All Plymouth radon work is performed by NRPP-certified, MDH-licensed partner contractors routed through Minnesota Radon Experts.
How Does Plymouth Compare on Minnesota Radon Levels?
Hennepin County averages 4.4 pCi/L indoor radon — well above the EPA action level of 4 pCi/L. Here's how Plymouth's radon profile compares to other Minnesota cities we serve.
| Metric | Plymouth, MN | Minnesota State Average | US National Average |
|---|---|---|---|
| Average indoor radon | 4.4 pCi/L | 4.4 pCi/L | 1.3 pCi/L |
| EPA Radon Zone | Zone 1 | Zone 1 (majority) | Varies (Zones 1–3) |
| % homes elevated (>4 pCi/L) | 40% | ~71% (2 in 5) | ~6% |
| Multiple of EPA action level | 1.1x | 2.1x | 0.3x |
| EPA action level | 4.0 pCi/L | 4.0 pCi/L | 4.0 pCi/L |
Check Your Plymouth Radon Test Result Against the EPA Action Level
Enter your radon test result (in pCi/L) to see whether your Plymouth, MN home meets the EPA action level of 4.0 pCi/L — and exactly what to do next based on official EPA guidance. Plymouth averages 4.4 pCi/L, with 40% of homes testing elevated.
Enter the picocuries-per-liter value from your charcoal canister or continuous radon monitor (CRM) report.
How the calculator maps test results to EPA guidance
| Radon level (pCi/L) | Risk tier | EPA-aligned recommendation |
|---|---|---|
| 0.0 – 1.9 | Below average — low | No action needed. Re-test every 2 years or after major renovation. |
| 2.0 – 3.9 | Elevated — EPA "consider mitigating" | Consider mitigation, especially with smokers, children, or lower-level bedrooms. Run a long-term (90+ day) test for confirmation. |
| 4.0 or higher | EPA Action Level — fix the home | Install an active radon mitigation system. EPA recommends fixing the home as soon as practical. |
Which Radon Services Are Available in Plymouth?
Radon Mitigation
Active radon mitigation system installation for Minnesota homes — sub-slab depressurization is the most common method, reducing in…
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Radon Testing
Professional radon testing services for Minnesota homes — short-term (2-7 day) and long-term (90+ day) testing options. Required f…
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Sub-Slab Depressurization Installation
Minnesota's most common radon mitigation method — sub-slab depressurization (ASD) creates negative pressure beneath the basement s…
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Crawl Space Radon Mitigation
Sub-membrane depressurization for Minnesota homes with crawl spaces — includes vapor barrier installation, sealing, and active dep…
Learn more →Do Plymouth Real Estate Transactions Require Radon Testing?
Minnesota law requires sellers to disclose any known radon test results to buyers. In practice, most Plymouth real estate transactions now include a radon contingency in the purchase agreement — and given that 40% of Plymouth homes test elevated, buyers are increasingly insisting on pre-closing mitigation when results exceed 4 pCi/L.
Our partner contractor network handles closing-timeline mitigations within typical 7–14 day windows, including post-mitigation verification testing to satisfy lender and inspector requirements.
Are Winter Radon Levels Higher in Plymouth?
Yes. Plymouth's cold winters intensify radon entry through the stack effect — heated indoor air rising creates negative pressure in basements that pulls soil gas into the home at higher rates than warmer climates. Plymouth winter radon readings are typically 30–50% higher than summer readings.
EPA recommends radon testing under closed-house conditions, which align naturally with Plymouth winters. If your Plymouth home tested low in summer, retest in winter for an accurate baseline before deciding on mitigation.
Recent Plymouth Radon Mitigation Projects
Recent radon mitigation projects across Minnesota — every image is geo-tagged to a specific Minnesota city and entity-described for transparency and provenance. All work performed by NRPP-certified, MDH-licensed partner contractors.
📍 Minneapolis, Minnesota 
📍 Minneapolis, Minnesota 
📍 Minneapolis, Minnesota Plymouth, MN Radon FAQs
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The Closest Minnesota Metros to Plymouth We Also Serve
The nearest cities to Plymouth in our statewide partner network. Click any for its county radon average, local profile, and a free quote.
Ready to Get a Free Plymouth Radon Quote?
Same-day routing to a Hennepin County NRPP-certified partner. Written quote within 48 hours of site assessment.