Ravalli, 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 Ravalli in Montana · Population: 45,807
TRI sites such as Lubrizol; Corixa Corp D/b/a Glaxosmithkline Vaccines - Hamilton; SDWIS systems such as HAMILTON CITY OF; STEVENSVILLE TOWN OF; DARBY TOWN OF anchor Ravalli, MT's EPA extract. Derived burden score 32/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Ravalli include DARBY TOWN OF; PINESDALE TOWN OF; GUERNSEY LAKE MOBILE HOME COMMUNITY, while Lubrizol leads reported TRI pounds among local Form R filers. AQS median AQI 24 / peak 182 in 2024.
Burden score 32/100 (Moderate 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 Ravalli -- 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.
Release-over-release change
What changed for Ravalli, MT: EPA TRI 2023 reporting year
Same facilities, both years
-28.1%
2 facilities that filed in 2022 and 2023
Whole inventory
-28.1%
32.2 thousand lb → 23.1 thousand lb, every facility that filed
- Ravalli, MT's total reported releases fell from 32.2 thousand lb in 2022 to 23.1 thousand lb in 2023, based on EPA TRI filings.
- Ravalli, MT's off-site transfers fell from 28 lb in 2022 to 0 lb in 2023, based on EPA TRI filings.
- Ravalli, MT's air releases fell from 32.1 thousand lb in 2022 to 23.1 thousand lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
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 |
|---|---|---|---|---|
| 2024 | 254 (70%) | 92 | 10 | 182 |
| 2023 | 293 (81%) | 69 | 1 | 110 |
| 2022 | 287 (79%) | 64 | 2 | 263 |
| 2021 | 268 (75%) | 67 | 18 | 159 |
| 2020 | 301 (83%) | 52 | 3 | 185 |
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 (24)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| HAMILTON CITY OF | 5,660 | 0 |
| STEVENSVILLE TOWN OF | 2,090 | 0 |
| DARBY TOWN OF | 850 | 2 |
| PINESDALE TOWN OF | 800 | 5 |
| TRAPPER CREEK JOB CORPS | 275 | 0 |
| KOOTENAI CREEK VILLAGE | 175 | 0 |
| CONWAY COMMONS MOBILE HOME PARK | 165 | 0 |
| STOCK FARM THE | 150 | 0 |
| DALY ESTATES SUBDIVISION | 123 | 0 |
| WILD FLOWER HOA, THE | 120 | 0 |
| CENTENNIAL HOMEOWNER'S ASSOCIATION, INC | 115 | 0 |
| GUERNSEY LAKE MOBILE HOME COMMUNITY | 100 | 2 |
| WHISPERING TREES MOBILE PARK | 100 | 1 |
| ANTIGONE ACRES HOA | 85 | 0 |
| WHITE BIRD COMMUNITY THE | 82 | 0 |
| VALLEY WATER SYSTEM THE | 82 | 0 |
| BIG SKY TRAILER CT HAMILTON | 70 | 0 |
| WILLOW GLEN TRAILER COURT KSPL | 69 | 0 |
| FOREST VIEW HOA | 65 | 0 |
| TWIN ACRES TRAILER COURT | 60 | 0 |
| PONDEROSA MOBILE HOME PARK | 60 | 0 |
| HONEY LANE COMMUNITY | 50 | 0 |
| BITTERROOT PINES TR CT FLORENCE | 45 | 0 |
| WARDS COVE WATER USERS | 45 | 2 |
TRI Facilities (2)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Lubrizol | 121.3K lbs |
| 2 | Corixa Corp D/b/a Glaxosmithkline Vaccines - Hamilton | 10.8K lbs |
Cities in Ravalli (7)
Frequently Asked Questions
What is the environmental risk level in Ravalli, 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.