Mountain Home Air Force Base
NPL SiteMountain Home, ID
According to the EPA Superfund Enterprise Management System, Mountain Home Air Force Base in Mountain Home, ID is listed with NPL status NPL Site. Its Hazard Ranking System (HRS) score is 57.80. The public extract catalogs 44 contaminant records for this site. EPA marks construction of the cleanup remedy as complete. NPL listing is a cleanup-authority designation, not a measured health-risk score.
Superfund National Priorities List inclusion (status and HRS score shown above) is the EPA's formal designation that a contaminated site qualifies for long-term federal cleanup authority under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). A federal-facility classification means the site is owned or operated by a federal agency, which routes cleanup responsibility differently than a privately owned site.
"Construction Complete" (status shown above) is an EPA milestone marking that the physical remedy work is finished, not that the site has exited EPA oversight; long-term monitoring can continue afterward. Deletion from the NPL is a separate, later step the EPA takes only once it determines every planned response action is finished.
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. HRS scores of 28.50 or above qualify a site for the NPL under the EPA screening model (toxicity, pathways, waste quantity, and affected population factors). For current site conditions and official community notices, see the EPA Regional Superfund profile and the Idaho environmental agency.
What is the cleanup status of this Superfund site?
Contaminants
| Contaminant | Media |
|---|---|
| 1,2,4-TRIMETHYLBENZENE | Soil |
| 1,2-DIMETHYLBENZENE (O-XYLENE) | Soil |
| 1,2-DIMETHYLBENZENE (O-XYLENE) | Soil Gas |
| 1,3 (OR 1,4)-DIMETHYLBENZENE (M (OR P)-XYLENE) | Soil |
| 1,3,5-TRIMETHYLBENZENE | Soil |
| 2-BUTANONE (METHYL ETHYL KETONE) | Soil |
| 4-METHYL-2-PENTANONE (METHYL ISOBUTYL KETONE) | Soil |
| 4-NITROPHENOL | Groundwater |
| ACETONE | Groundwater |
| ACETONE | Soil |
| ASBESTOS | Soil |
| ASBESTOS | Solid Waste |
| BENZENE | Groundwater |
| BENZENE | Soil |
| BENZENE | Soil Gas |
| BENZO(B)FLUORANTHENE | Soil |
| BENZO(K)FLUORANTHENE | Soil |
| BENZO[A]ANTHRACENE | Soil |
| BENZO[A]PYRENE | Soil |
| BIS(2-ETHYLHEXYL)PHTHALATE | Groundwater |
| BROMOFORM | Groundwater |
| CADMIUM | Groundwater |
| CHLOROFORM | Soil |
| CHLOROFORM | Soil Gas |
| CHROMIUM | Groundwater |
| CIS-1,2-DICHLOROETHENE | Soil Gas |
| COPPER | Groundwater |
| DI-N-OCTYL PHTHALATE | Groundwater |
| DICHLOROMETHANE (METHYLENE CHLORIDE) | Groundwater |
| DICHLOROMETHANE (METHYLENE CHLORIDE) | Soil |
| ETHYLBENZENE | Soil |
| INDENO(1,2,3-CD)PYRENE | Soil |
| LEAD | Groundwater |
| MERCURY | Groundwater |
| METHYLCYCLOHEXANE | Soil |
| NICKEL | Groundwater |
| PENTACHLOROPHENOL | Groundwater |
| TETRACHLOROETHENE | Soil |
| TOLUENE | Soil |
| TRICHLOROETHENE | Groundwater |
| TRICHLOROETHENE | Soil |
| TRICHLOROETHENE | Soil Gas |
| XYLENE (MIXED ISOMERS) | Soil |
| ZINC | Groundwater |
Location
Other Superfund Sites in Idaho
| Site Name | Status | HRS Score |
|---|---|---|
| Arrcom (Drexler Enterprises) | Deleted NPL Site | 29.28 |
| Blackbird Mine | Proposed NPL Site | 50.00 |
| Bunker Hill Mining & Metallurgical Complex | NPL Site | 54.76 |
| Eastern Michaud Flats Contamination | NPL Site | 57.80 |
| Idaho National Engineering Laboratory (USDOE) | NPL Site | 51.91 |
| Kerr-McGee Chemical Corp. (Soda Springs Plant) | NPL Site | 51.91 |
| Monsanto Chemical Co. (Soda Springs Plant) | NPL Site | 54.77 |
| Pacific Hide & Fur Recycling Co. | Deleted NPL Site | 42.30 |
| St. Maries Creosote | Proposed NPL Site | 50.00 |
| Stibnite/Yellow Pine Mining Area | Proposed NPL Site | 50.00 |
How does this site's HRS score compare in Idaho?
Of the 12 Idaho Superfund sites with a scored Hazard Ranking System (HRS) evaluation, Mountain Home Air Force Base ranks #2 by score (57.80).
Either side of it: Eastern Michaud Flats Contamination (57.80), Monsanto Chemical Co. (Soda Springs Plant) (54.77), Bunker Hill Mining & Metallurgical Complex (54.76)
Frequently Asked Questions
What is the Mountain Home Air Force Base Superfund site? ▼
What does NPL listing mean for Mountain Home Air Force Base? ▼
What is the HRS score for Mountain Home Air Force Base? ▼
What contaminants are at the Mountain Home Air Force Base site? ▼
What is the cleanup status of Mountain Home Air Force Base? ▼
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. See Superfund Sites Explained for how the National Priorities List, Hazard Ranking System, and cleanup phases work.
Read our methodology - how this data is sourced, computed, and verified.