Milltown Reservoir Sediments
NPL SiteMilltown, MT
According to the EPA Superfund Enterprise Management System, Milltown Reservoir Sediments in Milltown, MT is listed with NPL status NPL Site. Its Hazard Ranking System (HRS) score is 43.78. The public extract catalogs 21 contaminant records for this site. 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 Montana environmental agency.
What is the cleanup status of this Superfund site?
Contaminants
| Contaminant | Media |
|---|---|
| ARSENIC | Groundwater |
| ARSENIC | Soil |
| ARSENIC | Solid Waste |
| ARSENIC | Surface Water |
| CADMIUM | Groundwater |
| CADMIUM | Soil |
| CADMIUM | Solid Waste |
| CADMIUM | Surface Water |
| COPPER | Groundwater |
| COPPER | Soil |
| COPPER | Solid Waste |
| COPPER | Surface Water |
| LEAD | Groundwater |
| LEAD | Soil |
| LEAD | Solid Waste |
| LEAD | Surface Water |
| METALS | Groundwater |
| ZINC | Groundwater |
| ZINC | Soil |
| ZINC | Solid Waste |
| ZINC | Surface Water |
Location
Other Superfund Sites in Montana
| Site Name | Status | HRS Score |
|---|---|---|
| ACM Smelter and Refinery | NPL Site | 54.26 |
| Anaconda Aluminum Co Columbia Falls Reduction Plant | NPL Site | 68.39 |
| Anaconda Co. Smelter | NPL Site | 58.71 |
| Barker Hughesville Mining District | NPL Site | 50.00 |
| Basin Mining Area | NPL Site | 61.15 |
| Billings PCE | NPL Site | 50.00 |
| Carpenter Snow Creek Mining District | NPL Site | 50.00 |
| East Helena Site | NPL Site | 61.65 |
| Flat Creek IMM | NPL Site | 51.33 |
| Idaho Pole Co. | NPL Site | 38.29 |
How does this site's HRS score compare in Montana?
Of the 19 Montana Superfund sites with a scored Hazard Ranking System (HRS) evaluation, Milltown Reservoir Sediments ranks #14 by score (43.78).
Either side of it: Upper Tenmile Creek Mining Area (50.00), Lockwood Solvent Ground Water Plume (45.69), Idaho Pole Co. (38.29), Libby Ground Water Contamination (37.67)
Frequently Asked Questions
What is the Milltown Reservoir Sediments Superfund site? ▼
What does NPL listing mean for Milltown Reservoir Sediments? ▼
What is the HRS score for Milltown Reservoir Sediments? ▼
What contaminants are at the Milltown Reservoir Sediments site? ▼
What is the cleanup status of Milltown Reservoir Sediments? ▼
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.