Lake, MT
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 Lake in Montana · Population: 32,073
Lake, MT is tracked across three EPA datasets covering 0 Toxics Release Inventory (TRI) facilities, 54 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 15/100 (Low Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 0 lbs of reported toxic releases under EPCRA Section 313, while 13 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 9 and a peak AQI of 77 in 2024, with 94% 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.
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 | 108 (94%) | 7 | 0 | 77 |
| 2023 | 101 (93%) | 6 | 1 | 157 |
| 2022 | 93 (96%) | 3 | 1 | 120 |
| 2021 | 105 (90%) | 9 | 2 | 152 |
| 2020 | 111 (95%) | 3 | 1 | 183 |
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 (54)
| System | Population | Violations |
|---|---|---|
| BIGFORK COUNTY WATER AND SEWER | 6,100 | 0 |
| POLSON CITY OF | 5,300 | 0 |
| RONAN CITY OF | 2,483 | 2 |
| PABLO LAKE COUNTY WATER AND SEWER DIST | 2,175 | 7 |
| ST IGNATIUS TOWN OF | 700 | 3 |
| WOODS BAY WATER AND SEWER DISTRICT | 685 | 0 |
| CONSOLIDATED CHARLO LAKE CO W AND S DIST | 450 | 0 |
| ROUND BUTTE WATER COMPANY | 400 | 0 |
| JETTE MEADOWS LAKE CO W AND S DIST | 375 | 0 |
| ST IGNATIUS (MISSION) SO.SIDE | 356 | 0 |
| JETTE LAKE LANDOWNERS ASSOCIATION | 295 | 0 |
| PACHE WATER SYSTEM | 250 | 0 |
| RIDGEWOOD ESTATES | 250 | 0 |
| GREEN TREE MEADOWS COUNTY W &/OR S DIST | 237 | 0 |
| TURTLE LAKE WATER SYSTEM | 225 | 1 |
| DIXON, TOWN OF | 216 | 1 |
| ELMO WATER SYSTEM | 210 | 1 |
| ARLEE | 124 | 2 |
| MISSION MOUNTAIN LAKE CO W AND S DIST | 118 | 0 |
| WOODCOCK WATER SYSTEM | 101 | 0 |
| BEAR CREEK VILLAGE BIGFORK | 100 | 0 |
| PARADISE PINES | 95 | 0 |
| RANCH CO WATER & SEWER DIST THE | 90 | 0 |
| CLEARVIEW HEIGHTS WATER ASSN | 90 | 0 |
| BUFFALO MOUNTAIN SUBDIVISION | 90 | 0 |
| MISSION DAM WATER SYSTEM | 87 | 0 |
| SCHLEY WATER SYSTEM | 85 | 0 |
| MORNING STAR | 85 | 0 |
| MISSION MOUNTAIN VIEW HOA | 80 | 2 |
| DIXON (OLD AGENCY) | 72 | 3 |
| WOOD RIDGE HOA | 70 | 0 |
| CHIEF MARTIN CHARLO HOMESITE | 66 | 0 |
| BIG ARM WATER SYSTEM | 66 | 1 |
| CHRISTIAN CHILDRENS RANCH | 65 | 0 |
| CSKT DIVISION OF FIRE MANAGEMENT | 60 | 0 |
| SOUTH HILLS WATER USERS ASSOCIATION | 60 | 0 |
| SHELTER BAY ESTATES | 56 | 0 |
| KOOTENAI WOODS SUBDIVISION | 53 | 0 |
| OVERLOOK SUBDIVISION | 49 | 1 |
| PINEWOOD SHORES WUA | 46 | 0 |
| ALPINE MOBILE MANOR | 45 | 0 |
| PLEASANT VIEW WATER AND SEWER DISTRICT | 45 | 0 |
| CRANE MOUNTAIN ESTATES | 45 | 0 |
| EVARO WATER SYSTEM | 40 | 0 |
| TIMBERS AT WHITEFISH THE | 40 | 0 |
| HOULE VILLA WATER SYSTEM | 38 | 0 |
| MOUNTAIN VIEW TIMBERS HOA | 36 | 0 |
| CLARICE PAUL WATER SYSTEM | 35 | 0 |
| HILLSIDE HOMES | 35 | 3 |
| PONDERILLA HILLS LAKE COUNTY WATER SEWER | 35 | 0 |
| LEDGEWOOD ESTATES | 35 | 0 |
| GRAY WOLF VILLAGE | 32 | 2 |
| RIVER BLUFF HOA WHITEFISH | 32 | 0 |
| DAYTON WATER SYSTEM | 25 | 0 |
Frequently Asked Questions
What is the environmental risk level in Lake, Montana? ▼
Are there Superfund sites in Lake? ▼
How many toxic release facilities are in Lake? ▼
What is the air quality in Lake? ▼
Is the drinking water safe in Lake? ▼
What environmental agencies cover Lake? ▼
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.