Granite, CO Radon Levels

Q: What EPA Radon Zone is Granite in?

Granite is in Lake County, EPA Zone 1.

Q: How much does radon mitigation cost in Granite?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Granite radon levels and find certified testing and mitigation professionals to keep your home safe

Granite, CO Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Lake County, CO

Zip Code 81228

High in the Colorado Rockies within Lake County, Granite sits at extreme elevation where uranium-bearing granite bedrock creates significant radon potential. With limited testing data available for zip code 81228, homeowners should prioritize radon testing given the geological conditions. Mountain communities often see elevated readings due to the combination of granite geology and the building practices needed for high-altitude construction.

5.67

pCi/L area average

Above EPA Action Level

Lake County average: 5.67 pCi/L, based on 3 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Granite itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Granite, CO Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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Radon Readings Near Granite, CO

No homeowner tests have been submitted for Granite yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Buena Vista	14.6 mi	12.57 pCi/L	7
Leadville	15.3 mi	5.67 pCi/L	3
Fairplay	19.3 mi	12.00 pCi/L	9
Aspen	32.4 mi	4.00 pCi/L	1
Breckenridge	33.2 mi	8.00 pCi/L	1
Salida	37.6 mi	15.50 pCi/L	4
Gunnison	39.3 mi	7.38 pCi/L	8
Crested Butte	39.5 mi	8.56 pCi/L	9

Lake County Radon Profile

Because of its underlying geology, Lake County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 1 city in Lake County average 5.67 pCi/L across 3 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Lake County home regardless of zone or a neighbor's results.

Radon FAQ for Granite, CO

What EPA Radon Zone is Granite in?

Granite and the 81228 zip code are in Lake County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

Why are radon readings shown from areas near Granite?

No homeowner radon tests have been submitted for Granite yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Lake County average—are the best available indicator of local conditions until Granite homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Granite?

Radon mitigation in Granite typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Granite?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.