Missoula, 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 Missoula in Montana · Population: 119,639
TRI sites such as Roseburg Forest Products Co. - Missoula Particleboard; Hexion Inc.; Phillips 66 Missoula Products Terminal; SDWIS systems such as MISSOULA WATER; LOLO WATER AND SEWER DIST; SEELEY LAKE WATER DISTRICT; NPL sites such as Milltown Reservoir Sediments; Smurfit-Stone Mill anchor Missoula, MT's EPA extract. Derived burden score 47/100 (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 Missoula include WESTVIEW MOBILE HOME PARK; GOODAN KEIL CO WATER DIST; BAIR CLARK PROPERTIES, LLC, while Roseburg Forest Products Co. - Missoula Particleboard leads reported TRI pounds among local Form R filers. AQS median AQI 43 / peak 153 in 2024.
Burden score 47/100 (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 Missoula -- 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 Missoula, MT: EPA TRI 2023 reporting year
Same facilities, both years
-4.8%
4 facilities that filed in 2022 and 2023
Whole inventory
-4.8%
107.8 thousand lb → 102.6 thousand lb, every facility that filed
- Missoula, MT's total reported releases fell from 107.8 thousand lb in 2022 to 102.6 thousand lb in 2023, based on EPA TRI filings.
- Missoula, MT's land releases fell from 134 lb in 2022 to 112 lb in 2023, based on EPA TRI filings.
- Missoula, MT's air releases fell from 107.7 thousand lb in 2022 to 102.5 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 | 237 (65%) | 125 | 3 | 153 |
| 2023 | 156 (43%) | 200 | 8 | 134 |
| 2022 | 149 (41%) | 201 | 11 | 190 |
| 2021 | 122 (33%) | 213 | 24 | 162 |
| 2020 | 155 (42%) | 192 | 13 | 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 (66)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MISSOULA WATER | 68,200 | 0 |
| LOLO WATER AND SEWER DIST | 3,315 | 0 |
| SEELEY LAKE WATER DISTRICT | 1,575 | 0 |
| EL MAR ESTATES MSLA CO WATER | 1,350 | 0 |
| WESTVIEW MOBILE HOME PARK | 947 | 1 |
| PHANTOM HILLS WATER SYSTEM | 810 | 0 |
| TRAVOIS VILLAGE MOBILE PARK | 702 | 0 |
| GREENFIELD MOBILE HOME PARK | 620 | 0 |
| WYE AREA WATER SYSTEM | 512 | 0 |
| GRANT CREEK WATER USERS ASSOCIATION INC | 380 | 0 |
| KATOONAH LODGES | 258 | 0 |
| SORREL SPRINGS HOA | 250 | 0 |
| HOLLYWOOD HEIGHTS TRAILER PARK LLC | 220 | 0 |
| CIRCLE H WATER INC | 215 | 0 |
| WAGON WHEEL TRAILER VILLAGE | 210 | 0 |
| GOODAN KEIL CO WATER DIST | 207 | 2 |
| MISSION MEADOWS RV CAMPSITE PARK, INC | 200 | 0 |
| BAIR CLARK PROPERTIES, LLC | 180 | 1 |
| ELK MEADOWS RANCHETTES | 175 | 2 |
| MOBILE CITY TRAILER COURT | 175 | 0 |
| HAWTHORN SPRINGS PROPERTY OWNERS ASSOC | 165 | 0 |
| SPRING MEADOWS COUNTY WATER DISTRICT | 162 | 1 |
| OLD HELLGATE VILLAGE MSLA | 140 | 0 |
| MAGNOLIA ESTATES | 140 | 0 |
| TWO RIVERS MOBILE HM PK LOLO | 138 | 0 |
| SUNNY MEADOWS WATER AND SEWER DIST | 135 | 1 |
| BITTERROOT GATEWAY MB PK LOLO | 130 | 0 |
| FOREST INN LOUNGE AND APARTMENTS | 130 | 0 |
| BITTERROOT MEADOWS HOA LOLO | 120 | 0 |
| MEADOW BROOK PARK | 120 | 0 |
| VALLEY WEST TRAILER COURT | 115 | 0 |
| RIVERWALK AND DINOS ESTATES | 115 | 0 |
| LEWIS AND CLARK TRAILER COURT | 110 | 0 |
| TRESTLE CREEK I AND II | 110 | 0 |
| BEE HIVE HOMES MSLA | 106 | 19 |
| SUNSET WEST RSID | 105 | 0 |
| HARVEYS MOBILE HOME PARK | 98 | 0 |
| TAMARACK COURT | 75 | 11 |
| TURAH MEADOWS | 73 | 0 |
| KING RANCH SUBDIVISION | 70 | 1 |
| HIDDEN HEIGHTS HOA | 65 | 0 |
| BONNIE'S PLACE, INC | 60 | 0 |
| CIRCLE J TRAILER COURT | 59 | 0 |
| SUNSET PINES | 55 | 0 |
| NEW CASTLE COURT | 55 | 0 |
| GREENWOOD TRAILER COURT | 53 | 2 |
| HAMILTON MOBILE VILLAGE | 53 | 0 |
| FRENCHTOWN VALLEY VIEW TR CT | 50 | 0 |
| AMITY SQUARE WATER SYSTEM | 50 | 0 |
| GROVE THE | 50 | 0 |
| GRINELL ESTATES HOA | 48 | 0 |
| COUGAR MEADOWS | 45 | 0 |
| MILLTOWN COMMUNITY PWS SYSTEM | 43 | 0 |
| MOUNTAIN VIEW TRAILER COURT | 42 | 0 |
| OLD MILL PENINSULA HOA | 40 | 0 |
| COUNTRYSIDE COURT MISSOULA | 37 | 0 |
| BRANCO COURT | 37 | 0 |
| RENAE COURT SUBDIVISION | 36 | 0 |
| CATLIN STREET MOBILE COURT | 35 | 0 |
| NORTH DAVIS DUPLEXES 421 | 33 | 0 |
| PETERS - PRISKE APARTMENTS MISSOULA | 33 | 0 |
| CANYON PINES HOA | 32 | 0 |
| VALLEY GROVE WATER USERS ASSOCIATION | 30 | 0 |
| WHITEWATER PARK ASSOC BONNER | 25 | 0 |
| EAST VIEW ACRES WATER SYSTEM | 25 | 3 |
| WOODY MOUNTAIN RESIDENTIAL COMMUNITY | 25 | 0 |
TRI Facilities (4)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Roseburg Forest Products Co. - Missoula Particleboard | 489.3K lbs |
| 2 | Hexion Inc. | 89.5K lbs |
| 3 | Phillips 66 Missoula Products Terminal | 19.6K lbs |
| 4 | Jtl Group Missoula (dba Knife River-Missoula) | 618 lbs |
Superfund Sites (2)
| Site Name | Status | HRS Score |
|---|---|---|
| Milltown Reservoir Sediments | NPL Site | 43.78 |
| Smurfit-Stone Mill | Proposed NPL Site | 50.00 |
Cities in Missoula (9)
Frequently Asked Questions
What is the environmental risk level in Missoula, Montana? ▼
Are there Superfund sites in Missoula? ▼
How many toxic release facilities are in Missoula? ▼
What is the air quality in Missoula? ▼
Is the drinking water safe in Missoula? ▼
What environmental agencies cover Missoula? ▼
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.