Should I test my home for radon in Wisconsin?

Yes, absolutely. Wisconsin is Zone 1 (highest risk). The EPA recommends every home be tested, and in Zone 1 states it is especially urgent.

Wisconsin Indoor Air Quality Guide

Q: What is the radon level in Wisconsin?

Wisconsin is EPA Radon Zone 1 with an average of 5.9 pCi/L. Wisconsin is heavily Zone 1. Glacial deposits over uranium-bearing bedrock create widespread elevated radon. Dane and Waukesha counties average above 6 pCi/L.

Q: What are the biggest indoor air hazards in Wisconsin?

The top concerns are Radon Gas, Mold Exposure, Lead Paint Dust. Long cold winters with 6+ months of sealed homes. Basements are nearly universal and concentrate radon. Ice dams cause water intrusion and mold. Many older Milwaukee homes have lead paint.

EPA Radon Zone 1 — HIGH RISK Population: 5.9M

Wisconsin basements are so common that 85% of homes have potential radon entry points

Zone 1 — Highest potential (predicted average > 4 pCi/L)

Radon Levels in Wisconsin

Average Radon Level

5.9 pCi/L

EPA Zone

Zone 1

Wisconsin is heavily Zone 1. Glacial deposits over uranium-bearing bedrock create widespread elevated radon. Dane and Waukesha counties average above 6 pCi/L.

⚠️ Testing strongly recommended

Wisconsin is Zone 1 — the highest risk category. Test every home. If levels are 4 pCi/L or above, install a mitigation system immediately.

Top Indoor Air Hazards in Wisconsin

Radon Gas

CRITICAL

Radon is the #2 cause of lung cancer after smoking. It seeps from soil into basements and crawl spaces. You cannot see, smell, or taste it. The only way to know is to test.

Mold Exposure

HIGH RISK

Mold releases spores that trigger allergies, asthma attacks, and respiratory infections. Black mold (Stachybotrys chartarum) produces mycotoxins linked to neurological symptoms.

Lead Paint Dust

CRITICAL

Lead paint was banned in 1978 but remains in millions of homes. Sanding, scraping, or peeling paint releases lead dust that causes irreversible brain damage in children. There is no safe level of lead exposure.

Wisconsin Climate & Air Quality Factors

Long cold winters with 6+ months of sealed homes. Basements are nearly universal and concentrate radon. Ice dams cause water intrusion and mold. Many older Milwaukee homes have lead paint.

Recommended Products for Wisconsin Homes

First Alert Radon Gas Test Kit

EPA-listed short-term radon test. Lab fees included. Results in days.

Airthings Corentium Home Radon Detector

Continuous digital radon monitoring. No lab fees. Real-time readings.

RadonAway RP140 Radon Mitigation Fan

Professional-grade radon mitigation fan. 4-inch. The core component of any radon reduction system. Cuts radon levels by up to 99%.

Mold Armor DIY Mold Test Kit

Test air quality and surfaces for mold. Results in 48 hours.

🏠 Scan Your Home

Room-by-room hazard scanner — find dangers in your Wisconsin home

📋 Air Quality Quiz

2-minute risk assessment — get your home's danger score

Disclaimer

State-level radon data from EPA Zone Map. Individual home levels vary significantly. This guide is for educational purposes and not a substitute for professional environmental testing. Test your home regardless of zone designation.

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