Program Overview

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 2,300 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.)

Areas being sampled

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.

South Weber

Testing your home

The Air Force has tested the air in more than 2,300 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 for testing

Why we test

Past industrial activities at Hill AFB used a variety of chemicals to clean aircraft parts. Before environmental laws regulated how those chemicals were used and disposed, they were dumped into disposal pits. Over time, those chemicals seeped down into the ground, eventually reaching the shallow groundwater. The groundwater carried those chemicals off base and into the communities surrounding the base. In the early 2000s, the Air Force discovered that vapors from contaminated groundwater could be entering homes or businesses off base. Soon after, the Air Force began testing homes around the base for these chemical vapors. The Air Force expanded sampling to businesses and schools several years ago.

Click here to see how vapors can enter homes.

Points of Contact

Indoor Air Program Manager
Mark Roginske
(801) 775-3651

Peifen Tamashiro
(801) 775-6981

75th Air Base Wing Public Affairs
Barbara Fisher
(801) 775-3652

U.S. Environmental Protection Agency, Region 8
Sandra Bourgeois
(303) 312-6666
(800) 227-8917 ext. 312-6666

Utah Department of Environmental Quality
Craig Barnitz (Project Manager)
(801) 536-0071

David Allison (Public Involvement)
(801) 536-4479

2020 Sampling Season

The sampling season for 2020 begins October 2019 and runs through March 2020. If you live in or have a business in an area eligible for testing, you either have or will receive a certified letter inviting you to have your home or business tested. Letters will be mailed out in September of 2019. If you do not receive a certified letter, you are not in an area where vapor intrusion is an issue.

If you received a letter, please return the enclosed postcard 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.


The appearance of hyperlinks does not constitute endorsement by Hill Air Force Base, the United States Air Force, or the Department of Defense of the external website, or the information, products, or services contained therein. For other than authorized activities such as military exchanges and Services/Morale, Welfare and Recreation (MWR) sites, the United States Air Force does not exercise any editorial control over the information you may find at these locations. Such links are provided consistent with the stated purpose of the website.