
Sump pits & floor joints
Radon enters through sump pits, foundation cracks, and floor-wall joints — common in Watertown's river-adjacent basements where water management is a constant.

This Carver County Crow River town sits in Minnesota's high-radon region. A continuous-monitor radon test tells you exactly what's in the air on the lowest level of a Watertown home — whether it's a century-old downtown basement or a brand-new lower level.
Answer a few quick questions, get your free quote now, and pick a time. Radon testing is most affordable bundled with your inspection.
Radon is a colorless, odorless radioactive gas that rises from the soil and enters homes through foundation cracks, sump pits, and floor-wall joints. We measure it with a continuous radon monitor placed on the lowest livable level under closed-house conditions, recording hourly readings over at least 48 hours.
Results are reported in picocuries per liter (pCi/L) and compared against the EPA action level of 4.0 pCi/L. It's a quick, valuable add-on to a full home inspection. Learn more about radon testing or about home inspection in Watertown, MN.
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Watertown straddles the Crow River in Carver County, with a charming historic downtown on one side and growing new developments on the other. Radon collects in both the deep stone-and-block basements downtown and the tightly sealed lower levels of new construction — and a new home is no safer than an old one.

Radon enters through sump pits, foundation cracks, and floor-wall joints — common in Watertown's river-adjacent basements where water management is a constant.

Watertown sits in Carver County's high-radon region, where the glacial soils beneath the Crow River valley carry radon gas up into the homes above.

Watertown's new builds are sealed tight for efficiency, which can trap radon at higher levels in finished lower-level living space if it goes untested.
A professional continuous radon monitor that records hourly readings, not a single passive snapshot.
Placement on the lowest livable level under closed-house conditions, following EPA testing protocol.
A minimum 48-hour measurement period for an accurate, averaged result you can trust.
Results reported in picocuries per liter and compared against the EPA action level of 4.0 pCi/L.
Hourly logging that flags disturbances or open-house conditions affecting the reading.
Plain-language explanation of your result and what it means for mitigation, included in your report.
Use the calculator above to get your instant quote and book the test online.
The continuous monitor is set on the lowest livable level under closed-house conditions.
The monitor logs hourly readings for at least 48 hours for an accurate average.
Your pCi/L result and clear next steps delivered in your report, fast.
Pair radon testing with a full home inspection, a sewer scope, or mold testing, or learn more about home inspection in Watertown, MN. We serve Watertown and the surrounding Carver and Wright County communities.