San Luis, CO Radon Levels

Q: What EPA Radon Zone is San Luis in?

San Luis is in Costilla County, EPA Zone 2.

Q: How much does radon mitigation cost in San Luis?

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

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

San Luis, CO Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Costilla County, CO

Zip Code 81134

High in Costilla County within Colorado's San Luis Valley, this community sits at significant elevation where volcanic and sedimentary formations can contribute to radon production. Comprehensive testing data for zip code 81134 is currently unavailable to establish local radon averages. Given Colorado's generally elevated radon potential and the area's high-altitude setting, residents should prioritize professional testing to assess individual home risk levels.

14.00

pCi/L area average

Above EPA Action Level

Costilla County average: 14.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for San Luis 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+

San Luis, 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 San Luis, CO

No homeowner tests have been submitted for San Luis 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
Weston	36.3 mi	9.00 pCi/L	1
La Veta	36.3 mi	5.00 pCi/L	1
Fort Garland	50.0 mi	14.00 pCi/L	1

Costilla County Radon Profile

The soils and bedrock of Costilla County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Homeowner-submitted tests from 1 city in Costilla County average 14.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Costilla County to test, as levels can differ between neighboring homes.

Radon FAQ for San Luis, CO

What EPA Radon Zone is San Luis in?

San Luis and the 81134 zip code are in Costilla County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near San Luis?

No homeowner radon tests have been submitted for San Luis yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Costilla County average—are the best available indicator of local conditions until San Luis 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 San Luis?

Radon mitigation in San Luis 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 San Luis?

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.