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Top-Rated Radon detection and reduction specialists in Darien - Updated Nov 2026

Avatar for Gardner Services
Gardner Services
4.7(
17
)
Radon Gas - Abatement

Serving Darien, WI and surrounding areas

Approved

In business since 1996

Free estimates

Emergency services offered

"This is a high quality mold/fungi/fungus testing company, with excellent customer service and follow-up. The phones were picked up on the first call each time, and arranging for an appointment was very easy. They arrived on time, were efficient, informing, and friendly in their work, and brought commercial equipment to perform the test samples. The follow up phone call and email on the test results was good, and they provided a potential remediation plan for us to follow on the test results. The third party lab utilized by them had easy to understand numbers, graphs, and descriptions of what was tested. We will do business with Gardner Services again in the near future, and will recommend them to others."
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+18

Response time7 hrs
Response rate100%
11 neighbors recently requested a quote
Avatar for Property Services & Inspections, LLC
Property Services & Inspections, LLC
New to Angi
Radon Gas - Testing

Serving Darien, WI and surrounding areas

Approved

Free estimates

Credit card accepted

Property Services & Inspections, LLC is Wisconsin's trusted source for professional home inspection and environmental testing services. We help homeowners, buyers, sellers, and real estate professionals make informed decisions with thorough, unbiased inspections and accurate reporting.\n\nOur services include complete home inspections, indoor air quality testing, mold testing and radon gas testing. We use industry-standard methods and advanced equipment to identify potential issues affecting your properties safety, health, and value.\n\nAt Property Services & Inspections, LLC, we are committed to honesty, attention to detail, and exceptional customer service. Whether you're purchasing a new home, preparing to sell, or addressing concerns about air quality, mold, or radon, we provide the information and solutions you need for peace of mind.\n\nProudly serving southeastern Wisconsin and surrounding communities with reliable inspections and environmental services you can trust.

2 neighbors recently requested a quote
Avatar for Radman Radon Testing
Radman Radon Testing
5.0(
7
)
Radon Gas - Abatement

Serving Darien, WI and surrounding areas

In business since 2020

Free estimates

Warranties offered

"Nick contacted me almost immediately after scheduling my initial appointment through home advisor. He was timely with his appointments, professional during his conversations, and he worked efficiently during the project itself. I love that his work has a transferable written guarantee!!! His prices are competative, and his work is great. I would highly recommend him to anyone that needs to mitigate their home for radon gas."
Response time1 day
Recommended by100%of homeowners
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Radon Detection and Reduction FAQs, answered by experts

Radon is present almost everywhere but, like sunlight, the concentration levels and how often you are exposed to it have a large part to play in just how dangerous it is. There are levels of radon that are acceptable inside a house, but above a certain limit, radon becomes a serious radioactive hazard that is a known cause of lung cancer. In fact, radon exposure is the number two leading cause of lung cancer (after smoking).

Your radon mitigation system may be loud because it’s time to replace it. Any sounds are usually from the inline fan that helps create the vacuum and resulting airflow. If you hear a new, loud mechanical or humming noise from your radon fan, it might be time to replace it. Most fans used in radon mitigation systems last up to 10 years, but may need to be replaced sooner.

If high radon levels are detected, steps include sealing entry points, installing a mitigation system, and retesting the air regularly to ensure reduced levels.

The lifespan of a radon mitigation system depends on the type of system and its maintenance. With proper care, a system can last for many decades. Passive systems tend to last longer as they have fewer components that require replacement. Active systems, which have more moving parts like fans, generally have a shorter lifespan. For instance, water filtration devices and active pressurization systems require more frequent maintenance. While the system as a whole is durable, the radon fan in an active system typically has a lifespan of 5 to 10 years and will need to be replaced. As long as the fan is working, the mitigation system should function correctly.

Yes, many systems include warranties for performance. Confirm terms with your installer.

The Darien, WI homeowners’ guide to radon detection and reduction services

From average costs to expert advice, get all the answers you need to get your job done.