In seven communities surrounding Hill AFB, chemicals from historical practices at the base have contaminated areas of shallow groundwater. Since the groundwater is not used for drinking or other household uses, the only way for the public to be exposed to the chemicals in the groundwater is through a process known as vapor intrusion. Vapor intrusion occurs when chemicals from the groundwater evaporate and move into homes or businesses within the affected area. (Click here to see how vapors may move into homes or businesses.)Vapor intrusion doesn’t happen in every home or business within the affected area. Hill AFB's Indoor Air Sampling Program focuses on testing locations most likely to have vapor intrusion—those above or close to areas of shallow groundwater contamination. In cooperation with state and federal regulators, the Air Force has established contaminant levels at which it will recommend taking action to prevent vapors from the groundwater from entering the home or business. These levels are called Risk-Based Action Levels, or RBALs. (Click here for more information about RBALs.) All sampling and mitigation actions will be done at no cost to the resident.Since 2001, Hill has tested the air in more than 3,000 locations in communities surrounding the base affected by groundwater contamination. Less than 10 percent of homes and businesses tested have had vapor levels above an action level. A vast majority of those locations, however, were tested using a 24-hour method that could have missed vapor intrusion. Testing is now done with a 26-day sampler to ensure more accurate results. (Click here for more information about how testing methods have changed to more accurately determine if vapor intrusion is occurring.)
The maps linked below show the areas where air sampling is offered to homeowners, tenants, property owners and businesses as outlined by an orange line. Residences, businesses and schools within or touching the orange line are eligible for testing.Sunset-ClintonLaytonRiverdaleRoySouth WeberSouth Weber 2
In previous years, an Air Force sampling technician has placed and collected each sample from homes and businesses. This year, the Air Force has introduced a resident-placed sampling option so the sampling technician would not need to enter your home or building. The sampling technician would bring the sampling device to your door with instructions on the sampling procedure. To take advantage of this option, simply request resident-placed sampling when returning the provided response card.
Frequently Asked Questions
EPA's Vapor Intrusion Website
ToxFAQs (Agency for Toxic Substances and Disease Registry's Toxic Substances Portal)
Hill AFB Environmental Policy
Policy Flyer 2
The Air Force has tested the air in more than 3,100 homes since 2001. Testing is done during the heating season (October through March). Research has shown that this is the best time to detect vapor intrusion.
How the air is tested
Can household products trigger a detection?
Sampling method fact sheet
Preparing your home or business for testing
Gun owners, avoid cleaning your guns inside during the sampling period and make sure any cloth or brushes used in cleaning are moved and kept outside. Some gun cleaners contain trichloroethene. Cleaning your guns could cause a detection and dirty rags could still emit detectable levels of TCE vapors.
Click here to see how vapors can enter homes.
Hill AFB’s environmental cleanup documents are available for review online at https://ar.afcec-cloud.af.mil. The Air Force Civil Engineer Center Administrative Record website provides a way for the public to search and review documents regarding the environmental cleanup and sampling conducted at Hill AFB. Click HERE for a guide on how to search the Administrative Record website.
75th ABW Public Affairs
US EPA Region 8
(800) 227-8917 ext. 312-6666
(800) 227-8917 ext. 312-7097
Utah Department of Environmental Quality
Craig Barnitz (Project Manager)
David Allison (Public Involvement)
The sampling season for 2024 begins October 2023 and runs through March 2024. If you live in or have a business in an area eligible for testing, you either have or will receive a packet in the mail inviting you to have your home or business tested. Letters will be mailed out in September/October of 2023. If you do not receive a packet, you are not in an area where vapor intrusion is an issue.If you received a packet, please return the response card in the enclosed self-addressed stamped envelope so we can schedule your home or business for testing. We encourage everyone within the eligible areas to have their home or business tested, even if you've been tested before.
Si desea obtener más información sobre el Programa de Muestreo del Aire Interior de Hill AFB, pero prefiere hablar con alguien en español, comuníquese con Nate Nelson, al 801-775-6232. Favor de dejar un mensaje si no hay respuesta.