Colorado Radon Disclosure 101: A Beginner’s Guide to the New Rules

Buying or selling a home in the Centennial State is a bit like hiking a 14er: the views are breathtaking, the air is thin, and you really need to know where you’re stepping before you commit. While we all love the mountain vistas in Boulder and the urban pulse of the Denver Metro, there’s an invisible, odorless, and completely uninvited guest that likes to hang out in our basements.

Its name is Radon, and as of late 2023, the Colorado legislature decided it was time to make sure everyone was properly introduced.

If you’re a home buyer, seller, or a real estate pro, you’ve likely heard whispers about "the new radon law." Specifically, we’re talking about Senate Bill SB23-206, which officially went into effect in August 2023. At Plum Tree Home Inspections, we believe that knowledge isn't just power, it’s peace of mind. So, grab a cup of coffee (or a local craft brew, we don't judge), and let’s break down everything you need to know about Colorado’s new radon disclosure rules.

What’s the Big Deal with Radon, Anyway?

Before we dive into the legal jargon, let’s talk about why we care. Radon isn’t just some "inspector’s boogeyman" used to sell extra services. It is a Class A carcinogen. In non-science speak, that means it’s in the same category as asbestos and tobacco smoke.

Radon is a naturally occurring radioactive gas that comes from the breakdown of uranium in our soil. Because Colorado is essentially one giant rock pile (thanks, Rockies!), we have some of the highest radon potential in the country. It seeps through cracks in foundations, gaps in pipes, and even sump pumps.

According to the Colorado Department of Public Health and Environment (CDPHE), radon is the leading cause of lung cancer in non-smokers. Because you can’t see, smell, or taste it, the only way to know it’s there is to test for it.

A professional digital radon monitor recording air quality levels in a Colorado basement

Enter SB23-206: The New Rules of the Game

In the "before times" (pre-August 2023), radon disclosure was a bit more… casual. Now, the state has tightened the screws to ensure buyers and renters aren't left in the dark. Whether you’re closing a deal in Colorado Springs or listing a condo in Denver, here is what is now mandatory:

1. The Bold Advisory

Every residential sales contract must now include specific, bold-face radon advisory language. This isn't just a tiny footnote in size 8 font. It’s a clear warning stating that the CDPHE strongly recommends every buyer have an indoor radon test performed before purchase. It also reminds the seller that they are legally obligated to hand over any known radon info.

2. Full Disclosure of Records

If a seller has ever had a radon test done, they can’t just say "yeah, it was fine" over a handshake. They must provide:

  • Whether any radon tests have ever been conducted.
  • The most recent radon records and reports.
  • A description of any radon concentrations detected.
  • Details on any mitigation or remediation that has been performed.

3. The "Radon 101" Brochure

Sellers and landlords must now provide the buyer or tenant with the official CDPHE radon brochure. Think of it as the "Welcome to Colorado, watch out for the gas" handbook. This brochure outlines the risks and the importance of testing, ensuring that everyone is working from the same set of facts.

4. Mitigation System Details

If the home already has a mitigation system (those white PVC pipes you see running up the side of houses), the seller has to disclose that, too. They need to provide any documentation they have regarding the system's installation and operation.

Infographic showing how radon gas enters a home through the foundation and soil

The Realtor’s Secret Weapon: Transparency

If you’re a real estate agent, you might be thinking, "Great, another disclosure to track." But here’s the silver lining: these rules actually make your life easier. By standardizing the disclosure process, SB23-206 removes the "he-said, she-said" during the inspection objection period.

  • RE/MAX Agents: You guys love efficiency. Having these documents ready at the time of listing means fewer delays during the under-contract phase.
  • Keller Williams Agents: This is a perfect opportunity for education. Helping your clients understand the health risks (and the relatively simple solutions) builds that long-term trust you’re famous for.
  • eXp Agents: Digital efficiency is your game. Most of these disclosures can be handled via your digital transaction platforms, keeping everything organized and accessible.
  • Compass Agents: Providing a "Radon Portfolio" for a high-end listing in Boulder or Cherry Creek adds that layer of premium service and professionalism your clients expect.

At the end of the day, a radon issue isn't a deal-breaker, it's just a maintenance item. Most mitigation systems are highly effective and can be installed quickly, keeping the transaction moving forward smoothly.

Why Geography Matters: Denver, Boulder, and The Springs

You might wonder if these rules are "overkill" for certain areas. The short answer? No.

Colorado’s geology is unique. The "Front Range" sits right where the plains meet the mountains, creating complex soil structures. Whether you’re dealing with the expansive soils of Douglas County or the rocky terrain of the Boulder foothills, radon potential is high across the board.

We’ve seen homes in Colorado Springs test at 20.0 pCi/L (five times the EPA’s action level), while the house next door tests at 2.0 pCi/L. There is no "safe neighborhood," only "safe houses" that have been tested and mitigated.

Plum Tree Home Inspections homepage overview showing services and Arvada area focus

How Plum Tree Home Inspections Helps

Navigating these new rules doesn't have to be a headache. At Plum Tree Home Inspections, we specialize in providing the honest, clear, and "realtor-friendly" data you need to satisfy SB23-206.

We offer professional radon testing as a standalone service or as an add-on to our comprehensive home inspections. Our standard home inspections typically range from $450 to $600 for single-family homes, and adding a radon test is one of the smartest investments you can make during the due diligence period.

We use modern, calibrated continuous radon monitors (CRMs) that provide a detailed hour-by-hour breakdown of gas levels, rather than just a single average number. This gives you a much clearer picture of how the home "breathes" over a 48-hour period.

Our Service Highlights:

  • Integrity-First Reporting: We tell it like it is, without the "sky is falling" alarmism.
  • Clear Communication: We explain the results to buyers and sellers in plain English.
  • Regional Expertise: We know the specific soil and construction challenges in Denver, Boulder, and the Springs.
  • Follow-Up Support: We don't just drop a report and disappear. We’re here to answer questions long after the inspection is over.

A professional home inspector explaining radon results to a couple in a modern home

Final Thoughts: Don't Let the Gas Outsmart You

The new Colorado radon disclosure rules might seem like a lot of paperwork, but they are a massive win for public health and consumer protection. By ensuring that every buyer knows the risks and has access to previous test results, we’re making Colorado homes safer for the next generation of families.

Whether you’re a first-time buyer in Arvada or a seasoned investor in Aurora, don't skip the radon test. It’s a small price to pay for the "all-clear" on your family’s health.

Ready to schedule your next inspection or radon test?
Give us a call at +17205712498 or visit our website at www.plumtreeinspections.casa. We’re here to help you make your next move with total confidence.

Thank you for taking the time to stay informed about our local real estate landscape. If you have any follow-up questions about SB23-206 or how it affects your specific property, please don’t hesitate to reach out. We’re always happy to help!

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