Powder River, MT
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for Powder River in Montana · Population: 1,762
SDWIS systems such as ST LABRE INDIAN SCHOOL; BROADUS TOWN OF; ASHLAND WATER AND SEWER DIST anchor Powder River, MT's EPA extract. Derived burden score 6/100 (Low Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
No TRI Form R facilities sit in Powder River in this extract; water coverage still lists ST LABRE INDIAN SCHOOL; BROADUS TOWN OF; ASHLAND WATER AND SEWER DIST. AQS monitors logged median AQI 44 / peak 195 in 2023.
Burden score 6/100 (Low Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Powder River -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Air Quality History (2020–2023)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2023 | 244 (69%) | 99 | 6 | 195 |
| 2022 | 292 (80%) | 70 | 3 | 108 |
| 2021 | 230 (64%) | 113 | 11 | 169 |
| 2020 | 254 (73%) | 91 | 3 | 159 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Montana, see the EPA's AirNow.gov.
Water Systems (3)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| ST LABRE INDIAN SCHOOL | 650 | 60 |
| BROADUS TOWN OF | 450 | 0 |
| ASHLAND WATER AND SEWER DIST | 400 | 2 |
Cities in Powder River (2)
Frequently Asked Questions
What is the environmental risk level in Powder River, Montana? ▼
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What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.