Roseville Knowledge · Era-SpecificWhat Is the Radon Level in Roseville MN?
Ramsey County is EPA Radon Zone 1 — the highest-risk tier. Roseville basements built on glacial till routinely test 4 to 8 pCi/L. Here's what those numbers actually mean and what to do.
By Home Inspectors Roseville MN · Last reviewed May 2026
What the EPA Zone 1 designation actually means
Zone 1 = predicted average indoor radon ≥ 4.0 pCi/L. Ramsey, Hennepin, Anoka, Dakota all sit in it.
Real Roseville test results — typical ranges
Our 48-hour CRM data on Roseville basements: median 4.2 pCi/L, 90th percentile 8.5 pCi/L.
Why glacial till matters
The till under Roseville is permeable to soil gas — radon migrates upward into unsealed basements.
What 4.0 pCi/L actually means health-wise
EPA action level. Equivalent lifetime exposure to ~200 chest X-rays per year.
Mitigation cost in Roseville
$1,500–$2,500 for active sub-slab depressurization installed by a licensed MN contractor.
Related defect pages
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Same-week reports. Thermal imaging included. Era-specific findings for 1955–1975 ramblers, lakefront walkouts, and new-construction townhomes.