Homeowner guide
Radon testing in Colorado homes
General info only. Check with a licensed pro and your local building department.
If in doubt, stop and call a licensed professional.
How to test for radon and get help with mitigation, from CDPHE.
| Topic | What the source says | Source |
|---|---|---|
| Action level | EPA recommends fixing your home if radon is 4 pCi/L or more, and considering it between 2 and 4 pCi/L. | Official page checked 2026-10-30 |
| Why it matters | CDPHE: radon is found at elevated levels in one out of every two Colorado homes. | Official page checked 2026-10-30 |
| Lung cancer | CDPHE: radon is the leading cause of lung cancer among non-smokers in the U.S., about 500 deaths a year in Colorado. | Official page checked 2026-10-30 |
| How to test | Use an approved do-it-yourself test or hire a licensed radon measurement professional. CDPHE sells discounted kits. | Official page checked 2026-10-30 |
| Test setup | Close windows and doors 12 hours before and during the test. Run it at least 2 days (48 hours). Place it 2–7 feet off the floor in the lowest lived-in level. | Official page checked 2026-10-30 |
| Fixing it | All homes can be fixed with a mitigation system. | Official page checked 2026-10-30 |
| Renters | Tenants may test their own units. Since Aug 7, 2023, Colorado landlords must disclose radon information. | Official page checked 2026-10-30 |
| Low-income help | CDPHE runs Low Income Radon Mitigation Assistance (LIRMA). | Official page checked 2026-10-30 |
Not confirmed yet
- Unknown LIRMA income limits.
- Unknown Exact kit price.
Checked 2026-10-30. General information, not legal or tax advice. Rules change — confirm with the source. Report an error.