Arnold, MO Radon Levels

Q: What is the average radon level in Arnold, MO?

Based on 2 user-submitted tests, the average radon level is 10.50 pCi/L.

Q: What EPA Radon Zone is Arnold in?

Arnold is in Jefferson County, EPA Zone 2.

Q: How much does radon mitigation cost in Arnold?

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

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

Arnold, MO Radon Facts

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

County Jefferson County, MO

Zip Code 63010

Avg. User Level 10.50 pCi/L

User Tests 2

Arnold in Jefferson County has recorded an average radon level of 10.5 pCi/L, significantly exceeding the EPA action threshold and reflecting the high radon potential in the St. Louis Metro area. The community's location on limestone bedrock typical of eastern Missouri contributes to these elevated readings in zip code 63010. Residents should prioritize radon testing and implement mitigation systems to reduce indoor radon concentrations.

10.50

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Arnold, MO Radon Mitigation

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

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Arnold, Missouri Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
9 pCi/L	Arnold, MO	21-50 Years	Full Basement	Jul 2024
12 pCi/L	Arnold, MO	0-20 Years	Full Basement	Jul 2021

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

Jefferson County Radon Profile

Jefferson County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. Homeowner-submitted tests from 5 cities in Jefferson County average 8.86 pCi/L across 7 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Jefferson County.

Radon FAQ for Arnold, MO

What is the average radon level in Arnold, MO?

Based on 2 user-submitted tests, the average radon level in Arnold is 10.50 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 Arnold in?

Arnold and the 63010 zip code are in Jefferson 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.

How much does radon mitigation cost in Arnold?

Radon mitigation in Arnold 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 Arnold?

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.

Radon Levels Near Arnold, MO

User-submitted radon levels from the cities closest to Arnold with recorded test data. Explore nearby communities to compare local readings.

City	Distance	Avg User Level	Submissions
Imperial	3.2 mi	13.00 pCi/L	1
Fenton	6.6 mi	16.00 pCi/L	2
House Springs	9.3 mi	7.00 pCi/L	1
Ballwin	14.0 mi	4.00 pCi/L	1
Festus	16.9 mi	5.00 pCi/L	2
Chesterfield	17.7 mi	5.00 pCi/L	1
De Soto	23.3 mi	11.00 pCi/L	1
Hazelwood	24.2 mi	20.00 pCi/L	1