TRI Facilities
79
EPCRA Section 313 reporters
2023 EPA TRI data 79 facilities 809 water systems
Montana Environmental Profile
According to the U.S. Environmental Protection Agency's 2023 Toxics Release Inventory, Safe Drinking Water Information System, and Superfund National Priorities List, this is Montana's (MT) full public environmental-compliance record - toxic releases, drinking-water systems, and Superfund sites in one place.
MT regulatory profile by statute
Violation/site counts mapped to the EPA statutes this portal tracks
- CWA · NPDES
Clean Water Act, NPDES (water-system health violations)
198 records
- RCRA · Subtitle C 19
RCRA Subtitle C (Superfund-site proxy)
19 records
What this shows Counts are mapped to statute as a structural proxy and reflect reported activity, not toxicity-weighted or population-adjusted risk. Clean Air Act (Title V) permit data is not currently ingested by this portal, so air-permit compliance is not shown here.
Water Systems
809
SDWIS regulated
Superfund Sites
19
18 active NPL
Total Releases
276.8M lbs
TRI cumulative disclosure
Compliance Snapshot - MT
Sites with no recorded health violations 77.7%
Sites with at least one open violation 22.3%
Montana consolidates three federal EPA datasets into one statewide environmental profile: 79 Toxics Release Inventory (TRI) facilities reporting under EPCRA Section 313, 809 community water systems regulated under the Safe Drinking Water Act, and 19 sites on the Superfund National Priorities List.
TRI facilities in MT have cumulatively disclosed 276.8M lbs of toxic chemical releases, while SDWIS records show 1,430 total violations across the state's regulated water systems, of which 198 systems carry an active health-based violation (MCL exceedance or treatment-technique failure). Activity clusters in counties such as Flathead, Missoula, Yellowstone, which account for the highest combined facility, water-system, and Superfund presence.
Every figure reflects the public regulatory record as filed with the U.S. Environmental Protection Agency and is not weighted for toxicity, geographic footprint, or population exposure. A state can rank high in any individual metric because of industrial history, naturally occurring contaminants in source water, or simply the number of reporting facilities, not because current residents face unsafe conditions. Drill into any county or water system below for the full disclosure record.
What does this state's environmental record show?
TRI Facilities
79
Water Systems
809
Superfund Sites
19
Total Violations
1,430
Total Releases
276.8M lbs
Health Violations
198
water systems
Largest Polluters
View all →Water Quality
Systems with Health Violations
| Water System | Population | Violations |
|---|---|---|
| DENTON TOWN OF | 255 | 155 |
| FORT BELKNAP AGENCY WATER SYSTEM | 2,100 | 125 |
| WHITEHALL TOWN OF | 1,500 | 87 |
| HARLEM CITY OF | 820 | 68 |
| BEAVERHEAD JACKSON WATER AND SEWER DIST | 58 | 62 |
| ST LABRE INDIAN SCHOOL | 650 | 59 |
| CROW AGENCY WATER SYSTEM | 1,300 | 36 |
| KING RANCH COLONY | 56 | 36 |
| NCMRWA TIBER SERVICE AREA | 200 | 29 |
| CLARKS LOOKOUT | 62 | 26 |
| BLUE CLOUD SUBDIVISION | 60 | 26 |
| PHILIPSBURG TOWN OF | 1,360 | 25 |
| RICHLAND CO VALLEY VIEW WUA | 85 | 25 |
| ARROW CREEK TRAILER COURT | 75 | 21 |
| BLUE SKY HEIGHTS WUA CLANCY | 250 | 20 |
| TURNER COLONY | 50 | 20 |
| RIVERVIEW COLONY | 130 | 20 |
| HYSHAM TOWN OF | 262 | 19 |
| BEE HIVE HOMES MSLA | 106 | 19 |
| TIBER COUNTY WATER DISTRICT | 750 | 17 |
| CRYSTAL SPRINGS WATER SYSTEM | 225 | 15 |
| PALISADES APARTMENTS | 50 | 13 |
| HELENA WATER SYSTEM | 32,091 | 12 |
| LIBBY CITY OF | 4,892 | 12 |
| ELK CREEK COLONY | 84 | 12 |
| BIRNEY VILLAGE | 96 | 11 |
| TAMARACK COURT | 75 | 11 |
| OILMONT COUNTY WATER DISTRICT | 300 | 11 |
| PINNACLE ESTATES OF GLENDIVE | 50 | 11 |
| MILES CITY CITY OF | 9,565 | 10 |
| HAVRE CITY OF | 9,921 | 10 |
| MILFORD COLONY INC | 67 | 10 |
| WORDEN BALLANTINE YELLOWSTONE | 800 | 9 |
| FISHERMANS VILLAGE SUBDIVISION | 25 | 9 |
| RYEGATE TOWN OF | 270 | 8 |
| TWIN HILLS COLONY INC | 78 | 8 |
| HEART BUTTE SCHOOL | 250 | 7 |
| SOUTH WIND WATER AND SEWER DISTRICT | 200 | 7 |
| CHINOOK CITY OF | 1,300 | 7 |
| VIRGINIA CITY WATER DEPT | 1,500 | 7 |
| FLAXVILLE TOWN OF | 82 | 7 |
| PABLO LAKE COUNTY WATER AND SEWER DIST | 2,175 | 7 |
| LAME DEER WATER SYSTEM | 2,605 | 6 |
| COLSTRIP CITY OF | 2,350 | 6 |
| MT ELLIS ACADEMY | 106 | 6 |
| DUCK CREEK MOBILE HOME PARK | 70 | 6 |
| FORT PECK RURAL COUNTY WATER DISTRICT | 663 | 6 |
| BUSBY COMMUNITY WATER SYSTEM | 535 | 5 |
| COZY NORTHERN HOMES, LLC | 156 | 5 |
| GREAT FALLS CITY OF | 60,000 | 5 |
| PINESDALE TOWN OF | 800 | 5 |
| BROADWATER ESTATES HOA | 40 | 5 |
| HEART BUTTE WATER SYSTEM | 400 | 4 |
| SOUTH CHESTER WATER DIST | 55 | 4 |
| BLACK EAGLE CASCADE COUNTY WATER SEWER | 1,233 | 4 |
| FROMBERG TOWN OF | 500 | 4 |
| OPHEIM TOWN OF | 111 | 4 |
| WILSALL WATER DISTRICT | 250 | 4 |
| RIVERS EDGE MOBILE PARK LIBBY | 60 | 4 |
| HIGH QUALITY H2O | 200 | 4 |
| BIG BEND RANCH SUBDIVISION | 100 | 4 |
| BLACKFOOT WATER SYSTEM | 56 | 3 |
| WYOLA WATER SYSTEM | 261 | 3 |
| DIXON (OLD AGENCY) | 72 | 3 |
| MNIHNAPA WATER SYSTEM | 220 | 3 |
| ASHLAND COMMUNITY WATER SYSTEM | 265 | 3 |
| TWO MEDICINE WATER - EAST GLACIER | 1,504 | 3 |
| TOWN OF BROWNING | 4,671 | 3 |
| BASIN COUNTY WATER AND SEWER DIST | 200 | 3 |
| HILLSIDE HOMES | 35 | 3 |
| BOULDER CITY OF | 1,400 | 3 |
| COOKE CITY WATER DISTRICT | 300 | 3 |
| GERALDINE TOWN OF | 260 | 3 |
| LAUREL MUNICIPAL WATER SYSTEM | 6,339 | 3 |
| NASHUA TOWN OF | 300 | 3 |
| WIBAUX TOWN OF | 550 | 3 |
| ST IGNATIUS TOWN OF | 700 | 3 |
| TEN MILE AND PLEASANT VALLEY WUA | 750 | 3 |
| SKYLINE TR CT AND RV PARK | 75 | 3 |
| EAST VIEW ACRES WATER SYSTEM | 25 | 3 |
| SKYVIEW WATER AND SEWER UTILITY | 400 | 3 |
| GRANITE PARK WATER ASSOCIATION | 250 | 3 |
| BEDROCKBABB WATER SYSTEM | 645 | 2 |
| STARR SCHOOL WATER SYSTEM | 250 | 2 |
| SEVILLE WATER SYSTEM | 300 | 2 |
| PRYOR WATER SYSTEM | 406 | 2 |
| ARLEE | 124 | 2 |
| GRAY WOLF VILLAGE | 32 | 2 |
| TALL TIMBERS MOBILE HOME PARK | 90 | 2 |
| ALBERTON TOWN OF | 495 | 2 |
| RYAN DAM WATER SYSTEM | 230 | 2 |
| PLEASANT HILL ESTATES HOA | 90 | 2 |
| FLATHEAD COUNTY WATER DIST 101 | 210 | 2 |
| DARBY TOWN OF | 850 | 2 |
| DEVON WATER INC | 75 | 2 |
| DODSON TOWN OF | 120 | 2 |
| DUTTON TOWN OF | 338 | 2 |
| EUREKA TOWN OF | 1,995 | 2 |
| FAIRVIEW TOWN OF | 1,000 | 2 |
| HINSDALE WATER DEPARTMENT | 250 | 2 |
Cities with Water Issues
Big Timber
Pop: -
Laurel
Pop: -
Billings
Pop: -
Sidney
Pop: -
Miles City
Pop: -
Baker
Pop: -
Colstrip
Pop: -
Glendive
Pop: -
Great Falls
Pop: -
Shelby
Pop: -
Helena
Pop: -
Clancy
Pop: -
East Helena
Pop: -
Butte
Pop: -
Belgrade
Pop: -
Bozeman
Pop: -
Anaconda
Pop: -
Three Forks
Pop: -
Whitehall
Pop: -
Missoula
Pop: -
Superfund Sites (19)
| 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 |
| Libby Asbestos | NPL Site | - |
| Libby Ground Water Contamination | NPL Site | 37.67 |
| Lockwood Solvent Ground Water Plume | NPL Site | 45.69 |
| Milltown Reservoir Sediments | NPL Site | 43.78 |
| Montana Pole and Treating | NPL Site | 33.03 |
| Mouat Industries | NPL Site | 31.66 |
| Silver Bow Creek/Butte Area | NPL Site | 63.76 |
| Smurfit-Stone Mill | Proposed NPL Site | 50.00 |
| Upper Tenmile Creek Mining Area | NPL Site | 50.00 |
Counties (57 total)
| County | Facilities |
|---|---|
| Flathead | 5 |
| Missoula | 4 |
| Yellowstone | 18 |
| Gallatin | 4 |
| Lewis And Clark | 5 |
| Lake | 0 |
| Cascade | 5 |
| Ravalli | 2 |
| Lincoln | 1 |
| Madison | 0 |
| Glacier | 1 |
| Jefferson | 3 |
| Park | 0 |
| Toole | 2 |
| Hill | 0 |
| Sanders | 2 |
| Big Horn | 2 |
| Chouteau | 0 |
| Beaverhead | 1 |
| Carbon | 0 |
Showing top 20 counties by environmental activity. Montana has 57 counties total.
Largest Cities
Big Timber
Pop: -
1 facilities · 2 water systems
Columbus
Pop: -
2 facilities · 4 water systems
Decker
Pop: -
1 facilities · 0 water systems
Hardin
Pop: -
1 facilities · 2 water systems
Laurel
Pop: -
3 facilities · 5 water systems
Nye
Pop: -
1 facilities · 0 water systems
Billings
Pop: -
15 facilities · 38 water systems
Raymond
Pop: -
1 facilities · 0 water systems
Sidney
Pop: -
3 facilities · 3 water systems
Miles City
Pop: -
2 facilities · 5 water systems
Baker
Pop: -
1 facilities · 3 water systems
Colstrip
Pop: -
2 facilities · 1 water systems
Glendive
Pop: -
1 facilities · 5 water systems
Malmstrom Afb
Pop: -
1 facilities · 0 water systems
Great Falls
Pop: -
3 facilities · 18 water systems
Shelby
Pop: -
1 facilities · 3 water systems
Sun River
Pop: -
1 facilities · 1 water systems
Sweetgrass
Pop: -
1 facilities · 0 water systems
Helena
Pop: -
3 facilities · 38 water systems
Clancy
Pop: -
2 facilities · 9 water systems
Frequently Asked Questions
How many polluting facilities are in Montana? ▼
Montana has 79 facilities that report to the EPA Toxic Release Inventory (TRI). These facilities have collectively reported 276.8M lbs in total toxic chemical releases. TRI data is self-reported annually by facilities that manufacture, process, or use listed toxic chemicals above threshold amounts.
Does Montana have Superfund sites? ▼
Yes, Montana has 19 sites on the EPA Superfund National Priorities List (NPL). Superfund sites are contaminated locations identified for long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
Is the water safe in Montana? ▼
Montana has 809 EPA-regulated water systems. 198 water 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 data is available for Montana? ▼
PlainEnviro provides three categories of EPA environmental data for Montana: Toxic Release Inventory (TRI) data covering 79 industrial facilities, Safe Drinking Water Information System (SDWIS) data for 809 water systems, and Superfund National Priorities List (NPL) data for 19 contaminated sites.
How does Montana compare to other states environmentally? ▼
Montana has 79 TRI facilities with 276.8M lbs in total releases, 19 Superfund sites, and 1,430 water system violations on record. State-level environmental comparisons depend on many factors including industrial activity, population, and geographic size. Source: EPA TRI, SDWIS, and Superfund NPL databases.
Explore More Data for Montana
TRI Facilities in Montana →
Every toxic-release facility reporting in the state, ranked by volume
Drinking Water Systems in Montana →
Community water systems and their violation records
Air Quality in Montana →
County-level AQI from EPA monitoring stations
Compare states by burden →
EJ screening scores for every U.S. county
State environmental rankings →
How states compare on releases, water and Superfund
Browse all states →
Environmental profiles for every U.S. state
About This Data
This page aggregates environmental data from three EPA programs for Montana: the Toxic Release Inventory (TRI) for industrial chemical releases, the Safe Drinking Water Information System (SDWIS) for water quality, and the Superfund National Priorities List (NPL) for hazardous waste cleanup sites.
PlainEnviro presents this data without advocacy framing. Numbers reflect reported data and may not capture all environmental activity. For specific health or environmental concerns, contact your state environmental agency.
What to do with Montana's data
Use this state profile as a starting point, then drill into the specific dataset that matters to you.
- Check the 79 TRI facilities reporting in Montana for the largest reported releases near a specific county. View facilities
- 198 water systems in the state have a recorded health-based violation, check if yours is one of them. Check water systems
- See how Montana compares to other states on releases, water violations, and Superfund sites. State rankings
Reported data reflects what facilities and agencies disclose to the EPA; it is not a complete measure of environmental risk or a substitute for local guidance.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro Editorial
According to the U.S. Environmental Protection Agency, this state profile is drawn from PlainEnviro's database of more than 25,000 EPA-tracked facilities, the Safe Drinking Water Information System, and the Superfund National Priorities List, compiled since federal reporting began under the Emergency Planning and Community Right-to-Know Act in October 1986; see our methodology for full source citations and refresh cadence.
Every figure on PlainEnviro is rendered directly from EPA environmental compliance data, no number is typed in by an editor. State environmental figures are computed directly from EPA data. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.