Iowa — 275,000+ metro

Radon in Cedar Rapids,
IA

Cedar Rapids is in Linn County, consistently one of Iowa's highest-radon counties. Geological surveys show nearly all Linn County homes have detectable radon levels, with many well above the EPA action threshold.

Risk Level

Very High Risk

4–10 pCi/L

Typical range (area avg.)

EPA action level: 4 pCi/L

Why Cedar Rapids Has Very High Risk Radon

Eastern Iowa's geology features thick glacial deposits and limestone bedrock — both efficient pathways for radon to move from soil into structures. The Cedar River valley's alluvial soils compound the risk in low-lying neighborhoods.

Local Housing and Radon Risk

Cedar Rapids has extensive neighborhoods of mid-century ranch homes and full-basement bungalows, many built between 1940–1975. This housing stock predates radon-resistant construction requirements and is particularly vulnerable.

Testing Advice for Cedar Rapids Residents

Linn County Public Health recommends all homeowners test regardless of neighborhood. Post-flood mitigation is especially important in Cedar Rapids — flooding can disturb soil radon pathways and temporarily spike indoor levels.

How to Test Your Cedar Rapids 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 Cedar Rapids'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 Iowa, always verify your contractor's state certification. Sub-slab depressurization — the most effective mitigation method — typically costs $850–$1,500 installed in the Cedar Rapids area.

Frequently Asked Questions — Radon in Cedar Rapids

Is radon a real problem in Cedar Rapids?

Yes. Cedar Rapids is in Linn County, consistently one of Iowa's highest-radon counties. Geological surveys show nearly all Linn County homes have detectable radon levels, with many well above the EPA action threshold. 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 Cedar Rapids area, professional radon mitigation (sub-slab depressurization) typically costs $850–$1,500 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.