Landlord and Rental Radon in Colorado
Owning rental property in Colorado Springs now comes with radon homework. Under Senate Bill 23-206, effective August 7, 2023, Colorado landlords must disclose radon information before every lease signing, and tenants gained real remedies when elevated radon goes unaddressed. In El Paso County the underlying risk is not theoretical: El Paso County Public Health reports over 40 percent of homes tested from 2005 to 2023 exceeded the EPA action level. We connect rental owners with independent, Colorado-licensed radon professionals who produce the testing and mitigation paperwork the law now assumes you have.
What the law asks of rental owners
Disclose before every lease signing
Before a tenant signs, Colorado landlords must provide a radon warning statement recommending an indoor radon test, plus what the landlord knows: whether the property has been tested, the most current radon records, and whether a mitigation system is installed.
Respond when a test comes back high
The law gives tenants leverage when radon at or above 4 pCi/L goes unaddressed. A landlord who receives professional notice of an elevated level and does not mitigate within 180 days risks the tenant voiding the lease and vacating.
Keep records that travel
Test reports and mitigation documentation feed both the lease disclosure and, later, the sale disclosure that SB23-206 added to every Colorado residential contract. One licensed test produces paperwork you will reuse.
Think in units, not just buildings
Radon enters from the soil, so ground-contact units carry the exposure: garden levels, basements, and first floors on slabs. A licensed measurement professional plans unit sampling so the results actually represent the building.
This page summarizes the statute in plain language and is not legal advice. The bill text at leg.colorado.gov is the authoritative source, and a Colorado attorney can apply it to your specific leases.
A compliance sequence that actually finishes
- 1
Inventory your ground-contact units: basements, garden levels, and slab-on-grade first floors are where radon concentrates.
- 2
Test with a licensed measurement professional so the results are defensible in a disclosure or a dispute.
- 3
Mitigate any unit at or above 4 pCi/L with a licensed mitigation contractor. Most residential systems install in a single visit.
- 4
Retest after installation to document the reduced level.
- 5
Attach the records to your lease packets, and keep them for the sale disclosure Colorado now requires in every residential contract.
What mitigation costs a rental owner
The variables are the same as any home: foundation type, number of suction points, vent routing, and fan sizing, multiplied across however many ground-contact units need treatment. Licensed contractors quote in writing before any work, so you can budget per building instead of guessing. What Colorado state sources publish about typical single-home ranges is collected in our cost guide.
Coverage
Rental radon requests cover El Paso County and Teller County, from Fountain rentals near Fort Carson to Woodland Park cabins and everything between. Single-family questions live on the radon mitigation and radon testing pages.