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Disclose Radon Information Residential Property

Concerning information about radon in residential real property transactions.
2023 Regular Session
Bill Summary

The act requires a contract to sell residential real estate to contain, and a landlord of residential real estate to provide to prospective tenants, in writing:

  • A warning statement about the dangers of radon and the need for testing;
  • Any knowledge the seller or landlord has of the residential real property's radon concentrations and history, including tests performed, reports written, and mitigation conducted; and
  • The most recent brochure published by the department of public health and environment that provides advice about radon in real estate transactions.

If a landlord fails to provide the written disclosures or fails to mitigate an elevated radon level, the tenant may void the lease in accordance with the statutes governing the implied warranty of habitability; except that after January 1, 2026, the tenant may void the lease only if the lease is greater than one year in duration.

The real estate commission is required to promulgate rules requiring that these warnings and disclosures are made in real estate transactions that use a broker.

Colorado law requires a radon professional to be licensed. The act exempts a tenant from needing a license when the tenant is testing the property leased by the tenant.

APPROVED by Governor June 5, 2023

EFFECTIVE August 7, 2023

NOTE: This act was passed without a safety clause and takes effect 90 days after sine die.
(Note: This summary applies to this bill as enacted.)


Became Law


Bill Text

Colorado legislature email addresses ending in are no longer active. Please replace with for Colorado legislature email addresses. Details

The effective date for bills enacted without a safety clause is August 7, 2024, if the General Assembly adjourns sine die on May 8, 2024, unless otherwise specified. Details