PlainEnviro

Missoula, MT

Moderate Risk (37/100)

A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.

Environmental data for Missoula in Montana · Population: 119,639

Missoula, MT is tracked across three EPA datasets covering 4 Toxics Release Inventory (TRI) facilities, 67 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 37/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.

Industrial disclosures inside the county total 599.0K lbs of reported toxic releases under EPCRA Section 313, while 11 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 43 and a peak AQI of 153 in 2024, with 65% of observed days rated "Good" (0–50).

All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.

Population
119,639
TRI Facilities
4
Water Systems
67
Superfund Sites
0
Total Releases
599.0K lbs

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
2024 Good Air Quality: 65% of days
Unhealthy days: 4
Median AQI: 43

Source: EPA Air Quality System (AQS) Annual AQI by County 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 (67)

System Population 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
B & M ZOO SUBDIVISION 25 0
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

Cities in Missoula (2)

Missoula
Pop: -
4 facilities · 75 water
Milltown
Pop: -
0 facilities · 0 water

Frequently Asked Questions

What is the environmental risk level in Missoula, Montana? ▼
Missoula, MT has an environmental risk score of 37/100 (Moderate Risk), based on 4 TRI facilities, 0 Superfund sites, and 67 water systems on record. 11 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Missoula? ▼
No Superfund National Priorities List (NPL) sites are currently registered in Missoula, MT in the EPA database.
How many toxic release facilities are in Missoula? ▼
Missoula, MT has 4 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 599.0K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Missoula? ▼
In 2024, Missoula, MT recorded a median AQI of 43 and a peak AQI of 153. 65% of monitored days had "Good" air quality (AQI 0–50). Source: EPA Air Quality System (AQS) Annual AQI by County.
Is the drinking water safe in Missoula? ▼
Missoula, MT has 67 EPA-regulated water systems. 11 systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental agencies cover Missoula? ▼
Environmental compliance in Missoula, Montana is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Montana state environmental agency. Facilities report to the EPA Toxic Release Inventory, water systems are regulated under the Safe Drinking Water Act, and contaminated sites are managed under the Superfund program. Contact your state environmental agency for local concerns.

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.

Related Guides

Understanding EPA Data
How EPA collects and publishes environmental data
Environmental Justice
Who lives near polluters and environmental hazards
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro Editorial