PlainEnviro

Big Horn, MT

Moderate Risk (36/100)

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 Big Horn in Montana · Population: 12,963

Big Horn, MT is tracked across three EPA datasets covering 2 Toxics Release Inventory (TRI) facilities, 10 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 36/100 (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 530.0K lbs of reported toxic releases under EPCRA Section 313, while 5 water systems carry an active health-based violation in the SDWIS record. No EPA Air Quality System monitors currently report data for this county.

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
12,963
TRI Facilities
2
Water Systems
10
Superfund Sites
0
Total Releases
530.0K lbs

Water Systems (10)

System Population Violations
HARDIN CITY OF 3,500 0
CROW AGENCY WATER SYSTEM 1,300 36
WORDEN BALLANTINE YELLOWSTONE 800 9
LODGE GRASS TOWN OF 480 0
FORT SMITH WATER AND SEWER DISTRICT 450 0
PRYOR WATER SYSTEM 406 2
WYOLA WATER SYSTEM 261 3
YELLOWTAIL DAM GC SYSTEM 125 0
ARROW CREEK TRAILER COURT 75 21
WEGNER WATER SERVICE HAULER 50 0

TRI Facilities (2)

# Facility Total Releases
1 Hardin Generating Station 530.0K lbs
2 Decker Coal Co 6 lbs

Cities in Big Horn (2)

Decker
Pop: -
1 facilities · 0 water
Hardin
Pop: -
1 facilities · 2 water

Frequently Asked Questions

What is the environmental risk level in Big Horn, Montana? ▼
Big Horn, MT has an environmental risk score of 36/100 (Moderate Risk), based on 2 TRI facilities, 0 Superfund sites, and 10 water systems on record. 5 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Big Horn? ▼
No Superfund National Priorities List (NPL) sites are currently registered in Big Horn, MT in the EPA database.
How many toxic release facilities are in Big Horn? ▼
Big Horn, MT has 2 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 530.0K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Big Horn? ▼
Air quality monitoring data (EPA AQS) is not available for Big Horn, 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 Big Horn? ▼
Big Horn, MT has 10 EPA-regulated water systems. 5 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 Big Horn? ▼
Environmental compliance in Big Horn, 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