Lake, 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 Lake in Montana · Population: 32,073
SDWIS systems such as BIGFORK COUNTY WATER AND SEWER; POLSON CITY OF; RONAN CITY OF anchor Lake, MT's EPA extract. Derived burden score 15/100 (Low Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
No TRI Form R facilities sit in Lake in this extract; water coverage still lists BIGFORK COUNTY WATER AND SEWER; POLSON CITY OF; RONAN CITY OF. AQS monitors logged median AQI 9 / peak 77 in 2024.
Burden score 15/100 (Low 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 Lake -- 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.
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 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 (53)
| System | System pop (SDWIS) | 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 | 276 | 0 |
| RIDGEWOOD ESTATES | 250 | 0 |
| GREEN TREE MEADOWS COUNTY W AND S DIST | 237 | 0 |
| TURTLE LAKE WATER SYSTEM | 225 | 1 |
| ELMO WATER SYSTEM | 220 | 2 |
| DIXON, TOWN OF | 200 | 2 |
| ARLEE | 124 | 2 |
| MISSION MOUNTAIN LAKE CO W AND S DIST | 118 | 0 |
| BIG ARM WATER SYSTEM | 116 | 2 |
| 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 LAKE COUNTY WATER DIST | 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 |
| CHRISTIAN CHILDRENS RANCH | 65 | 0 |
| SOUTH HILLS WATER USERS ASSOCIATION | 60 | 0 |
| SHELTER BAY ESTATES | 56 | 0 |
| KOOTENAI WOODS SUBDIVISION | 53 | 0 |
| HOULE VILLA WATER SYSTEM | 50 | 0 |
| CRANE MOUNTAIN ESTATES | 50 | 0 |
| OVERLOOK SUBDIVISION | 49 | 1 |
| PINEWOOD SHORES WUA | 46 | 0 |
| ALPINE MOBILE MANOR | 45 | 0 |
| PLEASANT VIEW WATER AND SEWER DISTRICT | 45 | 0 |
| EVARO WATER SYSTEM | 40 | 0 |
| TIMBERS AT WHITEFISH THE | 40 | 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 |
Cities in Lake (7)
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.