Grand Lake, CO Radon Mitigation and Testing

Q: What is the average radon level in Grand Lake, CO?

Based on 2 user-submitted tests, the average radon level is 6.00 pCi/L.

Q: What EPA Radon Zone is Grand Lake in?

Grand Lake is in Grand County, EPA Zone 1.

Q: How much does radon mitigation cost in Grand Lake?

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

Avg: 6.00 pCi/L

Grand County

EPA Zone 1

2 user tests

Mountain community Grand Lake in Grand County shows an average radon level of 6.0 pCi/L, exceeding the EPA action threshold. Located at high elevation near Rocky Mountain National Park, the area's granite bedrock and seasonal cabin construction in zip code 80447 can trap radon gas effectively during winter months when homes are sealed tightly.

6.00

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Grand Lake, CO. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Grand Lake, CO Radon Mitigation

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

Grand Lake, CO Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Grand Lake, Colorado Radon Levels

User-submitted radon test readings from homes in the Grand Lake area.

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Grand Lake, CO	0-20 Years	No Basement/All Crawl Space	Mar 2026

Have a radon test result for Grand Lake? Submit your reading to help other homeowners.

Grand Lake Radon Facts

Key details about the radon risk profile for Grand Lake and the 80447 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Grand County, CO

Zip Code

80447

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

6.00 pCi/L

User Tests Submitted

Grand Lake and the 80447 zip code are located in Grand County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Grand Lake, CO

What is the average radon level in Grand Lake, CO?

Based on 2 user-submitted tests, the average radon level in Grand Lake is 6.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Grand Lake in?

Grand Lake and the 80447 zip code are in Grand 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.

How much does radon mitigation cost in Grand Lake?

Radon mitigation in Grand Lake 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 Grand Lake?

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.

Most Active Radon Markets in Colorado

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Fairplay	12.00 pCi/L	9
Crested Butte	8.56 pCi/L	9
Denver	6.22 pCi/L	9
Montrose	9.25 pCi/L	8
Gunnison	7.38 pCi/L	8
Buena Vista	12.57 pCi/L	7
Pueblo	10.67 pCi/L	6
Grand Junction	8.17 pCi/L	6
Bayfield	6.00 pCi/L	6
Canon City	10.80 pCi/L	5
Aurora	7.40 pCi/L	5
Windsor	7.00 pCi/L	5
Telluride	6.80 pCi/L	5
Parker	5.40 pCi/L	5
Salida	15.50 pCi/L	4
Johnstown	9.50 pCi/L	4
Granby	9.00 pCi/L	4
Longmont	8.00 pCi/L	4
Edwards	6.75 pCi/L	4
Mancos	6.00 pCi/L	4