Arizona — 1M metro

Radon in Tucson,
AZ

Pima County (Tucson) shows moderate-to-elevated radon in testing surveys. The surrounding Santa Catalina, Rincon, and Tucson Mountains contain significant granite formations that generate radon, making Tucson's outer suburbs and foothills areas worth careful testing.

Risk Level

Moderate Risk

1–4 pCi/L

Typical range (area avg.)

EPA action level: 4 pCi/L

Why Tucson Has Moderate Risk Radon

Tucson sits in the Basin and Range Province, surrounded by granitic mountain ranges. Alluvial fans extending from these ranges deposit uranium-bearing granite sediments throughout the valley floor — the same material much of Tucson's housing is built on.

Local Housing and Radon Risk

Tucson has a mix of slab-on-grade homes (lower risk) and older homes with partial basements or sunken living areas. The University of Arizona area has extensive historic housing stock that predates radon awareness.

Testing Advice for Tucson Residents

Foothills communities (Catalina Foothills, Sabino Canyon area) should prioritize testing given their proximity to granite mountain geology. Pima County Health Department provides radon information and referrals.

How to Test Your Tucson Home

Step 1: Choose Your Test Type

For initial screening, a charcoal short-term test kit ($12–$25) placed for 48–96 hours provides a quick result. For the most accurate reading, a long-term alpha-track test ($20–$35) left in place for 90+ days accounts for seasonal variation — especially important in Tucson's climate.

Step 2: Place the Test Correctly

Test in your lowest livable level — basement if you have one, otherwise the first floor. Keep the test 20 inches from the floor, away from windows and exterior walls. Close windows and doors 12 hours before and during the test for accurate results.

Step 3: Interpret Your Results

Below 2 pCi/L: low concern, retest every 2 years. 2–4 pCi/L: consider mitigation, retest in 2 years. 4 pCi/L or higher: the EPA recommends mitigation. Above 8 pCi/L: prioritize mitigation promptly.

Step 4: Hire a Certified Mitigator if Needed

If your test result is at or above 4 pCi/L, hire a certified radon mitigator. In Arizona, always verify your contractor's state certification. Sub-slab depressurization — the most effective mitigation method — typically costs $900–$1,700 installed in the Tucson area.

Frequently Asked Questions — Radon in Tucson

Is radon a real problem in Tucson?

Yes. Pima County (Tucson) shows moderate-to-elevated radon in testing surveys. The surrounding Santa Catalina, Rincon, and Tucson Mountains contain significant granite formations that generate radon, making Tucson's outer suburbs and foothills areas worth careful testing. The EPA recommends all homes be tested regardless of location — radon levels can vary significantly even between neighboring properties.

How much does radon mitigation cost in this area?

In the Tucson area, professional radon mitigation (sub-slab depressurization) typically costs $900–$1,700 installed. This is a one-time cost that reduces radon by 50–99%. The system requires minimal maintenance and a mitigator can typically complete the work in 3–5 hours.

Should I test if I have a new home?

Absolutely. New homes built with radon-resistant features still show elevated levels in testing — construction conditions and local geology vary too much to assume any home is safe. Test within the first year of occupancy, especially if your home has a basement.

Can I test radon myself, or do I need a professional?

DIY testing is reliable and recommended as a first step. Short-term kits ($12–$25) and long-term kits ($20–$35) are accurate when placed and returned correctly. Professional testing is only required for real estate transactions in some states. If your DIY test shows elevated levels, use a certified professional for both confirmation testing and mitigation.