Phoenix, AZ Radon Mitigation and Testing

Q: What is the average radon level in Phoenix, AZ?

Based on 10 user-submitted tests, the average radon level is 5.40 pCi/L.

Q: What EPA Radon Zone is Phoenix in?

Phoenix is in Maricopa County, EPA Zone 2.

Q: How much does radon mitigation cost in Phoenix?

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

Avg: 5.40 pCi/L

Maricopa County

EPA Zone 2

10 user tests

Arizona's capital city in Maricopa County shows an average radon level of 5.4 pCi/L across multiple Phoenix zip codes, moderately exceeding the EPA's 4.0 pCi/L action threshold. Desert soil conditions and the prevalence of slab-on-grade construction throughout the Phoenix Metro area create varied radon entry patterns. Even in Arizona's arid climate, radon testing remains important for homeowners across all Phoenix neighborhoods.

5.40

pCi/L average

Above EPA Action Level

Based on 10 user-submitted radon tests for homes in Phoenix, AZ. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Phoenix, AZ Radon Mitigation

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

Phoenix, AZ Radon Testing

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

Phoenix, Arizona Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Phoenix, AZ	51-99 Years	No Basement/All Slab	Nov 2024
4 pCi/L	Phoenix, AZ	21-50 Years	No Basement/All Slab	Feb 2024
3 pCi/L	Phoenix, AZ	0-20 Years	No Basement/All Slab	Feb 2024
4 pCi/L	Phoenix, AZ	0-20 Years	No Basement/All Slab	Jan 2024
5 pCi/L	Phoenix, AZ	21-50 Years	No Basement/All Slab	Jan 2024

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

Phoenix Radon Facts

Key details about the radon risk profile for Phoenix and the 85003 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Maricopa County, AZ

Zip Code

85003

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

5.40 pCi/L

User Tests Submitted

Phoenix and the 85003 zip code are located in Maricopa County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Phoenix, AZ

What is the average radon level in Phoenix, AZ?

Based on 10 user-submitted tests, the average radon level in Phoenix is 5.40 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 Phoenix in?

Phoenix and the 85003 zip code are in Maricopa 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 Phoenix?

Radon mitigation in Phoenix 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 Phoenix?

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 Arizona

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

City	Avg User Radon Level	Submissions
Prescott	6.79 pCi/L	14
Scottsdale	7.75 pCi/L	12
Phoenix	5.40 pCi/L	10
Mesa	6.40 pCi/L	5
Flagstaff	6.00 pCi/L	5
Tucson	5.25 pCi/L	4
Payson	6.67 pCi/L	3
Glendale	6.50 pCi/L	2
Peoria	3.00 pCi/L	2
Prescott Valley	4.00 pCi/L	1
Gilbert	3.00 pCi/L	1
Tempe	3.00 pCi/L	1