Steps to Take After Discovering Elevated Radon Levels in Your Milwaukee, WI Home

What Does a High Radon Test Result Actually Mean?

A high radon test result indicates that the air inside your home contains radon gas at or above the action level set by health authorities. In the United States, the Environmental Protection Agency (EPA) recommends action when indoor radon levels reach 4.0 picocuries per liter (pCi/L) or higher. This threshold is based on extensive research showing increased risks of lung cancer at these concentrations.

For area households, elevated readings do not immediately mean you’re in danger, but they do signal a long-term health risk if not addressed. Milwaukee homes can test high for radon regardless of age, construction style, or neighborhood. Testing high is surprisingly common in the region due to local soil and geological factors.

Should You Retest if Your Home Shows High Radon?

Retesting can help confirm results and rule out anomalies. After receiving a high reading:

• Conduct a second radon test if the first was a short-term test (2-7 days).
• Use a long-term test (up to 12 months) for a more accurate view, especially if only slightly above the action level.
• Repeat the test in the same lowest-lived-in area, following directions for closed-house conditions.

Short-term spikes can happen due to weather, open windows, or heating system operation, so local residents often benefit from confirming with a second test before deciding on further steps.

How Serious Is Radon Exposure in Milwaukee?

Radon is the number one cause of lung cancer for non-smokers in the U.S. Prolonged exposure, especially at higher levels, increases risk over time. Southeastern Wisconsin’s geology, combined with colder months when windows are sealed, makes radon a hidden concern for many households.

Radon doesn’t produce symptoms you can see or smell; its effects can take years to develop. This is why public health agencies in the area emphasize mitigation if levels remain high after retesting.

What Are the Next Steps if Levels Stay High?

If both tests confirm high radon:

• The most effective solution for area homes is an active soil depressurization system, which vents radon from beneath the house to the outdoor air before it enters living spaces.
• These systems are typically installed through the basement floor or crawlspace, which is common in older and newer homes throughout the city.
• Simple sealing of cracks alone rarely brings levels down enough to be reliable in most Milwaukee homes.

While do-it-yourself mitigation information is available, residents should be aware that improper installation can actually increase radon levels or cause other indoor air quality issues. Proper system design is influenced by factors like foundation type, slab integrity, and airflow patterns, all of which can vary widely in this diverse housing market.

Are There Any Local Rules or Resources to Know?

Milwaukee and the Wisconsin Department of Health Services both reference EPA guidelines on radon, but there are currently no state laws requiring mitigation or disclosure in most typical real estate transactions. However, radon information is sometimes included in home sale disclosures, and some buyers or sellers voluntarily negotiate testing and mitigation.

The Wisconsin Radon Information Center and environmental sections of the City of Milwaukee Health Department provide information specific to the area’s geology and climate, as well as updates on community programs. Public health offices occasionally offer free or discounted radon test kits, especially during colder months.

How Long Does Radon Mitigation Take and What’s Involved?

For most area homes, installing a mitigation system takes less than a day. The process typically involves:

• Drilling a small hole in the basement slab or crawlspace floor.



• Connecting a PVC pipe to this point, running it through the house and out above the roofline.
• Installing a continuously operating inline fan to pull radon gas out from below the home.

Local weather, house layout, and foundation conditions can affect both timing and system design. After installation, a follow-up test should confirm that levels have dropped below the recommended action level.

Will Fixing Radon Change How You Use Your Home?

A well-designed mitigation system should not noticeably alter daily life in the home. The fan is usually quiet, and the system is mostly out of sight. Periodic checks (every few years) ensure it is still functioning. Area residents sometimes notice a slight lowering of indoor humidity, since some systems also draw out ground moisture.
It’s also safe for families, pets, and energy systems. Opening windows for ventilation is only a temporary measure and is not recommended as a long-term solution, especially during the winter when homes in the city are closed up for months at a time.

What Are Some Common Misconceptions About High Radon?

Several myths persist locally, including:

• "Newer homes don’t have radon problems." In fact, high levels are just as common in newer neighborhoods; modern energy-efficient construction can even increase risk.
• "Testing once is enough." Radon can fluctuate with seasons and weather. Testing new living spaces, after renovations, or every few years is wise.
• "Only basements get radon." While lower levels usually have higher concentrations, radon can travel throughout the home.
• "Short-term test kits aren’t reliable." Well-placed short-term tests, when used according to instructions, are accurate enough to prompt next steps; long-term tests offer more certainty when decisions are unclear.

Can Seasonal Changes in Milwaukee Affect Radon Levels?

Radon concentrations often rise during the winter, as homes are sealed against the cold and air exchange with outdoors drops. Spring thaws and heavy rain can also push soil gases into basements and lower levels. The best time to test is typically during the heating season, but high readings at any time of year are cause for action.

Local residents should be especially attentive to radon levels after foundation work, adding living space in the basement, or significant landscaping changes, all of which can alter soil gas flow.