Radon Testing | Sierra Nevada Radon

Radon is the #1 cause of lung cancer in non‑smokersPer the EPA, about 21,000 U.S. lung cancer deaths each year are attributed to radon gas exposure.

Living with radon at 4.0 pCi/L, about 7 out of every 1,000 non‑smokers could get lung cancer, the same as the risk of dying in a car crash. For smokers it’s about 62 out of 1,000.

There’s no “safe” level of radonAny amount of radon exposure carries some lung cancer risk.

There is no known safe level of radon gas. Our goal is to get your radon levels as low as reasonably achievable.

Below 4.0 pCi/L doesn’t mean “safe”The majority of radon-related lung cancers come from homes measuring below 4.0 pCi/L.

The U.S. EPA action level of 4.0 pCi/L is not a safety threshold. It was set in 1986 based on what testing and mitigation could reliably achieve over 40 years ago. Mitigation techniques have come a long way since then.

Children and pets may be more vulnerableSmaller lungs and faster breathing can mean a bigger dose of radon.

Children breathe faster than adults for their size and have smaller lungs. Kids and pets also spend more time on the floor and on the lowest level of a home, where radon levels are usually highest. A 2020 veterinary study found more lung tumors in dogs and cats living in high‑radon areas.

Sources: U.S. EPA, EPA Assessment of Risks from Radon in Homes, EPA Citizen’s Guide to Radon, World Health Organization, NH Dept. of Health & Human Services, Journal of Veterinary Internal Medicine (2020)

Radon levels fluctuate daily and by season.

Radon levels are higher during the colder seasons, which is why testing should be done in both hot and cold seasons for accuracy. Levels also change daily, climbing overnight while the house is closed up and dropping in the afternoon. The graph below is an example of the peaks and valleys a continuous monitor records in a typical Northern California home where radon is present.

Hourly radon readingTest averageWorld Health Organization action level (2.7 pCi/L)U.S. EPA action level (4.0 pCi/L)Night (8 PM to 6 AM)

Illustrative data modeled on typical hourly monitor readings. Your home's levels and pattern will differ, which is why testing matters.

Professional Radon Testing

Professional testing with official reporting

Radon testing technology has come a long way with continuous radon monitors (CRM). We use the Ecosense RadonEye Pro, one of the most accurate NRPP-approved devices, to conduct our tests.

We place the monitor in your home, then deliver an official report with your results and our recommendations so you can make an informed mitigation decision.

Ecosense RadonEye Pro continuous radon monitor with its carrying case, an NRPP approved measurement device

What’s included

An official, documented report accepted for real estate transactions
NRPP-certified technicians following established testing protocols
NRPP-approved equipment, calibrated annually by an independent lab
Testing across all foundation types: slab, basement, crawlspace or combinations
Flexible scheduling to minimize disruption to your household
Quick turnaround with real‑estate‑ready reporting
Your results explained, with mitigation recommendations based on real data

When you need a professional test

Homeowners, renters, and tenants You are health‑conscious and want an accurate, documented snapshot of radon levels.
Buying or selling a home Buyers, agents and lenders expect an official, documented result.
Landlords and property owners Documented results to protect you and your tenants.
Schools, offices and public buildings Testing follows established NRPP protocols.

Why you should test and consider mitigation

Radon levels fluctuate daily and by season.

Professional testing with official reporting

What’s included

When you need a professional test

Sierra Nevada Radon can help you breathe easy.