PlainEnviro

Madison, MT

Low Risk (9/100)

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 Madison in Montana · Population: 8,975

SDWIS systems such as BIG SKY COUNTY WATER AND SEWER DIST 363; VIRGINIA CITY WATER DEPT; ENNIS TOWN OF anchor Madison, MT's EPA extract. Derived burden score 9/100 (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 Madison in this extract; water coverage still lists BIG SKY COUNTY WATER AND SEWER DIST 363; VIRGINIA CITY WATER DEPT; ENNIS TOWN OF. No AQS county monitors report here.

Burden score 9/100 (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 Madison -- 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.

County population (Census ACS)
8,975
TRI Facilities
0
Water Systems
18
Superfund Sites
0
Total Releases
0 lbs

Water Systems (18)

System System pop (SDWIS) Violations
BIG SKY COUNTY WATER AND SEWER DIST 363 4,132 0
VIRGINIA CITY WATER DEPT 1,500 9
ENNIS TOWN OF 1,400 0
SHERIDAN TOWN OF 632 0
ANDESITE RIDGE WATER SYSTEM 450 1
TWIN BRIDGES TOWN OF 424 0
LOWER PIONEER MOUNTAIN WATER SYSTEM 350 2
VALLEY GARDEN GOLF VILLAGE HOA 195 0
LAZY J SOUTH SUBDIVISION 122 0
ENCAMPMENT TRAIL 100 0
GATEWAY VILLAGE SYSTEM 7 77 0
WESTERN MOBILE VILLAGE DILLON 75 0
GATEWAY VILLAGE SYSTEM 5 70 0
GATEWAY VILLAGE SYSTEM 2 68 0
GATEWAY VILLAGE SYSTEM 3 68 0
GATEWAY VILLAGE SYSTEM 4 60 0
SPANISH PEAKS MOUNTAIN CLUB 40 0
LONE VIEW RIDGE WATER SYSTEM 37 0

Cities in Madison (6)

Big Sky
0 facilities · 12 water
Ennis
0 facilities · 2 water
Alder
0 facilities · 1 water
Sheridan
0 facilities · 1 water
Twin Bridges
0 facilities · 1 water
Virginia City
0 facilities · 1 water

Frequently Asked Questions

What is the environmental risk level in Madison, Montana? ▼
Madison, MT has an environmental risk score of 9/100 (Low Risk), based on 0 TRI facilities, 0 Superfund sites, and 18 water systems on record. 3 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Madison? ▼
No Superfund National Priorities List (NPL) sites are currently registered in Madison, MT in the EPA database.
How many toxic release facilities are in Madison? ▼
Madison, MT has 0 TRI-reporting facilities on record with the EPA Toxic Release Inventory. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Madison? ▼
Air quality monitoring data (EPA AQS) is not available for Madison, MT. This may indicate no EPA monitoring stations are located in the county. For regional air quality data, see the state environmental profile or visit EPA's AirNow.gov.
Is the drinking water safe in Madison? ▼
Madison, MT has 18 EPA-regulated water systems. 3 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 Madison? ▼
Environmental compliance in Madison, 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.

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