Hill Air Force Base

Location

Contaminants of concern

• 1,1,1-TRICHLOROETHANE
• 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE
• 1,1,2-TRICHLOROETHANE
• 1,1-DICHLOROETHENE
• 1,2-DIBROMO-3-CHLOROPROPANE
• 1,2-DICHLOROBENZENE
• 1,2-DICHLOROETHANE
• 1,2-DICHLOROETHENE (CIS AND TRANS MIXTURE)
• 1,2-DICHLOROPROPANE
• 2,4-DINITROTOLUENE

Contaminated media

• Groundwater
• Free-phase NAPL
• Soil
• Soil Gas
• Sediment
• Surface Water

Cleanup timeline

1. Initial Assessment Completed — 06/01/1984
2. Proposed to the National Priorities List — 10/15/1984
3. Finalized on the National Priorities List — 07/22/1987
4. Remedial Investigation Started — 02/14/1986
5. Remedy Selected — 09/30/1991
6. Remedial Action Started — 01/30/1992
7. Final Remedial Action Started — Estimated Dec 2027 - Feb 2028
8. Construction Completed — Not Yet Achieved
9. Deleted from National Priorities List — Not Yet Achieved
10. Most Recent Five-Year Review — 12/19/2023

EPA references

• EPA facility record →
• EPA Superfund profile →

EPA-regulated facilities nearby

• U.s. Dod, Usaf, Hill Afb — Hill Afb · 1.6 mi · 19.9k lb releases
• Futura Aluminum — Clearfield · 2.8 mi · 68 lb releases
• Nexeo Solutions Llc - Clearfield Environmental Services — Clearfield · 2.8 mi · 1.6k lb releases
• Utility Trailer Mfg Co — Clearfield · 3.6 mi · 17 lb releases
• Out Of The Woods — Layton · 3.7 mi · $1.0k penalties
• South Weber — South Weber · 4.1 mi · 250 lb releases
• Kroger Corp Smiths Food & Drug Dairy Div — Layton · 4.2 mi · 7.5k lb releases
• Madison Townhomes On 40th - Horizontal — South Ogden · 4.5 mi · $2.0k penalties
• Williams International Co Llc — Ogden · 5.2 mi · 33 lb releases
• Jbt Aerotech Jetway Systems — Ogden · 5.6 mi · 24 lb releases

Understanding this Superfund site

Hill Air Force Base is a federal Superfund site in Utah. The Superfund program, created by Congress in 1980, addresses sites where hazardous substances have been released or threaten release into the environment. EPA scores potential sites using the Hazard Ranking System; those that score high enough are placed on the National Priorities List.

Current status: Cleanup underway. Active cleanup is underway, meaning EPA has approved a remediation plan and work is in progress. Cleanup timelines vary widely — some sites take decades depending on contamination depth, groundwater involvement, and funding availability.

EPA has identified 10 contaminants of concern at this site, including 1,1,1-trichloroethane, 1,1,2-trichloro-1,2,2-trifluoroethane, 1,1,2-trichloroethane. Contamination has been detected in groundwater, free-phase napl, soil, soil gas, sediment, surface water.

If you live near this site and have health concerns, your state health department can provide site-specific guidance. EPA maintains a community involvement program for most NPL sites, and site documents — including the Record of Decision, five-year reviews, and public health assessments — are typically available through EPA's Superfund site profile.