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.

All sampling and mitigation actions will be done at no cost to the resident.

Since 2001, Hill has tested the air in more than 3,100 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 24- to 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.

Sunset-Clinton
Layton
Riverdale
Roy
South Weber
South Weber 2

New Resident-Placed Sampling Option

In previous years, an Air Force sampling technician placed and collected each sample from homes and businesses. Recently, the Air Force introduced a resident-placed sampling option, allowing the sampling technician to deliver the sampling device to your door without needing to enter your home or building. The sampling technician will provide clear instructions for completing the sampling yourself.  To choose this option, simply indicate “resident-placed sampling” when signing up for sampling.

Additional Environmental Links

Testing your home or business

Since 2001, the Air Force has tested the air in more than 3,100 locations in communities around Hill AFB. Testing is conducted during the heating season (October through March) – when doors and windows are typically closed – because research shows this is the most effective time to detect vapor intrusion. Learn more about the sampling process:

How the air is tested

Can household products trigger a detection?

Sampling method fact sheet

Preparing your home or business for testing

Important reminder for gun owners: Many gun-cleaning products contain trichloroethene (TCE) – one of the chemicals being tested for. Even small amounts on cleaning materials can release vapors that may interfere with test results.  To avoid a false detection during the sampling period:
•    Do not clean firearms indoors
•    Move any used rags, cloths, or cleaning brushes outside.

Why we test

In the past, Hill AFB used various chemicals to clean aircraft parts. Before environmental regulations were in place, these chemicals were often disposed of in unlined pits.  Over time, those chemicals seeped into the soil and reached the shallow groundwater beneath the base. The contaminated groundwater eventually moved off-base and into nearby communities. In the early 2000s, the Air Force discovered that vapors from contaminated groundwater could be entering homes or businesses off base – a process known as vapor intrusion. 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.

 

Clean up documents

Hill AFB’s environmental cleanup documents are available for review online at https://ar.cce.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.  

Points of Contact

IAP Manager
Julie McNeill
(801) 586-2194
julie.mcneill.1@us.af.mil

75th ABW Public Affairs
(801) 777-2284
75abw.pa@us.af.mil

US EPA Region 8
Julie Kinsey
(303) 312-7065
kinsey.julie@epa.gov

Utah Department of Environmental Quality
Kaleb VanArsdale (Project Manager)
(385) 391-5925
kvanarsdale@utah.gov

David Allison (Public Involvement)
(385) 391-8143
dallison@utah.gov

2026 Sampling Season

The sampling season for 2026 begins October 2025 and runs through March 2026. If you live in a home or own a business within an area eligible for testing, you will receive a postcard in the mail directing you to this website for more information.

To be eligible for sampling, your home, business, or property must be located within the affected areas shown on the attached maps.  The Air Force, Environmental Protection Agency, and Utah Department of Environmental Quality encourage all eligible locations to participate – even if your location has been tested in the past.  Updated testing methods provide more accurate results and help ensure continued protection.

For more information, including a letter from the Air Force, EPA, and UDEQ, and fact sheet with more details, please see the packets of information below:

2025-2026 IAP Packet of Information: Clinton, Layton, Riverdale, Roy, Sunset Residential Locations

2025-2026 IAP Packet of Information: South Weber Residential Locations

2025-2026 IAP Packet of Information: Business Locations

How to Sign Up

If you received a postcard or find your location is eligible for sampling, you can now sign up and schedule an appointment using your mobile phone or computer. To do so, scan the QR code or visit the web address provided on the postcard. 

If you prefer to sign up by phone or email, you may contact Julie McNeill, the IAP Project Manager, at the contact information above.

Información en Español

Paquete de Información IAP 2025-2026: Residencial

Paquete de Información IAP 2025-2026: Negocios

Preguntas Frecuentes

Postal sobre productos químicos domésticos que afectan el aire interior 

Tarjeta postal con opción de muestreo colocada por el residente 

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.