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Verified Reviews for Radon Detection And Reduction pros in Durham, CA

*The Angi rating for Radon Detection And Reduction companies in Durham, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

*The HomeAdvisor rating for Radon Detection And Reduction companies in Durham, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

Last update on January 17, 2026

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Avatar for Environmental Testing & Research Laboratories, Inc

Environmental Testing & Research Laboratories, Inc

4.85(
347
)

Environmental Testing & Research Laboratories, Inc

4.85(
347
)
Customers say: True professional
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

AAA HERS RATERS

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AAA HERS RATERS

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AAA HERS RATER is going to prove to be the #1 company you'll ever need for your Residential HERS testing and verification requirements for Alterations, existing home and new construction in California. With over 30 years as a home builder and inspector you can be assured that every bit of your report is done accurately and completed with quality testing and observation. Complete testing services are available and include whole house Blower Door pressurization and depressurization testing, Duct testing, Infrared Camera inspection, and any testing process that are required on your CF-1R inspections requested by mortgage and banking entities or just for your own personal curiosity, understanding or personal confidence that your home is safe and healty and your indoor air quality is the best that you can have for your health and family well being.

AAA HERS RATER is going to prove to be the #1 company you'll ever need for your Residential HERS testing and verification requirements for Alterations, existing home and new construction in California. With over 30 years as a home builder and inspector you can be assured that every bit of your report is done accurately and completed with quality testing and observation. Complete testing services are available and include whole house Blower Door pressurization and depressurization testing, Duct testing, Infrared Camera inspection, and any testing process that are required on your CF-1R inspections requested by mortgage and banking entities or just for your own personal curiosity, understanding or personal confidence that your home is safe and healty and your indoor air quality is the best that you can have for your health and family well being.

Radon Detection and Reduction questions, answered by experts

Yes, radon testing is absolutely necessary if you suspect the presence of this hazardous gas, and the Environmental Protection Agency (EPA) recommends testing for all homes in the country. Radon is a pervasive natural gas that can leak through your home’s foundation and seep into the living areas. Unfortunately, the gas is highly carcinogenic and is the second leading cause of lung cancer. Radon testing is crucial for keeping you and your family safe from harm, so hire a radon mitigation specialist to test your home if you suspect its presence in your home.

Radon enters your home when warm air begins to rise and exits through the roof, creating a vacuum that pulls cooler air from under the foundation. Part of that air is radon, which is an invisible, odorless gas that develops naturally when radioactive particles are deep within the ground. Those particles usually come from decaying matter in soil and rocks.

Costs depend on property size, test types, and additional services like mold sampling.

Sampling typically takes 1-3 hours, and depending on the provider, lab results are available within 2-7 days.

You should have a professional test for radon every two to five years. A good rule of thumb is to get testing done every five years if you’ve never had an issue before and every two years if you have. You may also want to schedule testing if you notice symptoms of radon exposure or if you do intermittent DIY radon testing and notice changes in your levels between tests. If you have an active radon monitor, you can schedule testing if you notice levels increasing over time.

The Durham, CA homeowners’ guide to radon detection and reduction services

From average costs to expert advice, get all the answers you need to get your job done.

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