What is radon and why should I be concerned?

Radon is a naturally occurring radioactive gas that can enter homes through cracks and openings in the foundation. Long-term exposure to high radon levels is the second leading cause of lung cancer in the U.S., making testing and mitigation essential for protecting your family’s health.

How often should I test my home for radon?

It’s recommended to test your home every two years, or sooner if you’ve made structural changes, finished your basement, or recently moved in. Even homes that previously tested low can develop higher radon levels over time.

How long does radon mitigation take?

Most radon mitigation system installations can be completed in a single day. I personally handle all installations to ensure quality and efficiency, and I’ll walk you through the process so you know exactly what to expect.

Will a mitigation system change how my home looks?

Radon mitigation systems are designed to be as discreet as possible. I take care to place system components in locations that are both effective and minimally visible, while still meeting all performance and safety standards.

Radon Testing & Mitigation based in Cottage Grove

Owner-Operated Radon Testing and Mitigation Focused on Your Safety

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Welcome To

1st Defense Radon Testing And Mitigation

1st Defense Radon Testing And Mitigation, owned and operated by Steve Larsen, proudly serves Cottage Grove, MN, and surrounding areas. Specializing in accurate radon testing and effective mitigation solutions, Steve personally handles every installation, ensuring quality workmanship and attention to detail. Known for being highly organized, punctual, and committed to customer safety, 1st Defense delivers reliable, long-lasting results. With a small business approach and years of hands-on experience, Steve provides personalized service you can trust for your home or business.

Protecting Your Home and Health with Expert Radon Solutions in Cottage Grove, Minnesota

Radon is the second leading cause of lung cancer in the United States, and because it’s undetectable without professional testing, many property owners are unaware of its presence. At 1st 1st Defense Radon Testing And Mitigation, we believe your home should be the safest place for you and your family. With over 10 years of experience, we specialize in detecting and reducing radon gas—a dangerous, odorless, and invisible threat that can cause serious health risks if left unaddressed. Our mission is simple: to provide accurate testing, effective mitigation, and lasting peace of mind for homeowners and businesses throughout Cottage Grove, Minnesota, and surrounding areas. We combine advanced technology, proven mitigation systems, and a commitment to customer care to deliver reliable, long-term solutions for your safety.

why choose us

Meticulous and Organized Process

I take pride in running a well-structured and detail-oriented operation, ensuring every step of your radon testing and mitigation is handled efficiently and without oversight.

On-Time, Every Time

I value your time and maintain a punctual schedule, arriving when promised and completing projects within the agreed timeframe.

Owner-Operated Service

As the owner, I personally handle every installation, giving you the quality, accountability, and personal touch only a small, hands-on business can provide.

Proven Quality and Experience

With years of expertise and a dedication to doing the job right the first time, I deliver results you can trust for the long-term safety of your home or business.

CLIENT TESTIMONIALS

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Steve called me and offered to come out and inspect my radon system and fix my problem within a couple hours of calling me. He replaced my defective fan and will be coming back to complete the rest of the issues next week. He was very prompt and knowledgeable.

Kathy S.

our services

Radon Testing
Comprehensive radon testing service uses advanced detection equipment to measure harmful gas levels accurately, providing homeowners and businesses with clear results, actionable insights, and expert recommendations for improving indoor air quality and ensuring a healthier, safer living or working environment.
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Residential Radon Testing
Thorough radon testing for homes identifies hidden gas levels with precision tools, delivering detailed reports and offering solutions to safeguard families from radon exposure. Our process ensures accurate readings and peace of mind about your indoor air quality at home.
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Radon Mitigation System Installation
Installation of radon mitigation systems is designed to effectively lower indoor radon levels, protect your health, and comply with safety standards. We create custom solutions tailored to each property, ensuring long-term performance, efficiency, and reliable operation for safer indoor environments.
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Radon Mitigation System Repair
Expert repair services help restore radon mitigation systems to full functionality, addressing airflow issues, fan malfunctions, and sealing defects. We ensure optimal operation, maintain safe indoor radon levels, and extend the system’s service life through careful diagnostics and precise repairs.
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Continuous Radon Monitoring
Real-time radon monitoring solutions track gas levels constantly, alerting you to changes before they become dangerous. This proactive service ensures consistent indoor air safety, supports early detection, and provides long-term protection for your property and the people inside.
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Pre-Purchase Real Estate Radon Inspections
Detailed radon inspections are conducted before real estate transactions to uncover potential hazards. Our testing provides buyers and sellers with critical safety information, ensuring informed decisions, compliance with disclosure laws, and a safe living environment for future occupants of the property.
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Post-Mitigation Testing
Follow-up testing verifies radon mitigation systems are effectively reducing gas levels to safe limits. We provide documented results, ensure compliance with recommended safety standards, and give homeowners peace of mind that their indoor air quality meets healthy guidelines.
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Crawl Space Sealing & Encapsulation
Sealing and encapsulating crawl spaces block radon entry points, prevent moisture damage, and improve air quality. This process enhances overall home health, energy efficiency, and safety by creating a controlled, protective barrier between your living space and the ground.
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Sump Pit & Drain Sealing
Professional sealing of sump pits and drains stops radon gas infiltration through these common entry points. Our service improves system efficiency, reduces harmful exposure, and complements other radon mitigation efforts for complete property-wide protection against radon hazards.
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Radon System Upgrades & Maintenance
Upgrading and maintaining radon systems enhances performance, extends service life, and ensures compliance with current safety standards. Regular inspections and improvements help keep radon levels low, maintain air quality, and protect your investment in long-term home safety.
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Commercial Radon Testing
Specialized radon testing for commercial buildings provides accurate measurements, detailed reporting, and tailored mitigation recommendations. Our service helps protect employees, tenants, and customers from radon exposure while ensuring compliance with health and safety regulations for your workplace or business property.
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This is one of the best companies we’ve ever worked with! Steve is informative and does great work! Radon mitigation system is outstanding and doing exactly what it’s supposed to be doing!

Jessica O.

This company provided prompt and gracious service for considerably cheaper than their competitors. I had them replace the exhaust fan in my radon reduction system. I recommend them highly.

Stephen H.

Very responsive and competitively priced. Did the job quickly and cleaned up afterwards

David H.

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Jane Faber

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RECENT PROJECTS

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service areas

Inver Grove Heights, MN

Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again. Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again.

Shannon W.

Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again. Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again.

Jane D.

Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again. Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again.

Lukas A.

Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again. Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again.

Shannon W.

Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again. Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again.

Jane D.

Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again. Adam showed up on time, did the job quickly, and was polite and professional. Would definitely use again.

Lukas A.

FREQUENTLY ASKED QUESTIONS

What is radon and why should I be concerned?
Radon is a naturally occurring radioactive gas that can enter homes through cracks and openings in the foundation. Long-term exposure to high radon levels is the second leading cause of lung cancer in the U.S., making testing and mitigation essential for protecting your family’s health.

How often should I test my home for radon?
It’s recommended to test your home every two years, or sooner if you’ve made structural changes, finished your basement, or recently moved in. Even homes that previously tested low can develop higher radon levels over time.

How long does radon mitigation take?
Most radon mitigation system installations can be completed in a single day. I personally handle all installations to ensure quality and efficiency, and I’ll walk you through the process so you know exactly what to expect.

Will a mitigation system change how my home looks?
Radon mitigation systems are designed to be as discreet as possible. I take care to place system components in locations that are both effective and minimally visible, while still meeting all performance and safety standards.

Eliminate Radon Risks with Our Expert Solutions

Radon is a serious but manageable risk. The first step toward a safer home is knowing your radon levels. At 1st Defense Radon Testing And Mitigation, we make the process simple, affordable, and effective—from detection to complete mitigation.

Whether you’re buying a home, maintaining your current property, or building new, our team is ready to provide the professional expertise you need. Don’t wait until it’s too late—schedule your radon test today and take the first step toward cleaner, healthier air.