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Jefferson, MT

Moderate Risk (38/100)

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 Jefferson in Montana · Population: 12,501

TRI sites such as Barrick Gold Corp-Golden Sunlight Mine; Ash Grove Cement Co Montana City Plant; Marks-Miller Post & Pole Inc; SDWIS systems such as WHITEHALL TOWN OF; BOULDER CITY OF; SADDLE MOUNTAIN CORP CLANCY; NPL sites such as Basin Mining Area anchor Jefferson, MT's EPA extract. Derived burden score 38/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.

Health-flagged SDWIS rows in Jefferson include WHITEHALL TOWN OF; BOULDER CITY OF; BLUE SKY HEIGHTS WUA CLANCY, while Barrick Gold Corp-Golden Sunlight Mine leads reported TRI pounds among local Form R filers. No AQS county monitors report here.

Burden score 38/100 (Moderate 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 Jefferson -- 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.

Release-over-release change

What changed for Jefferson, MT: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

+81.7%

3 facilities that filed in 2022 and 2023

Whole inventory

+81.7%

40.6 thousand lb → 73.8 thousand lb, every facility that filed

  • Jefferson, MT's total reported releases rose from 40.6 thousand lb in 2022 to 73.8 thousand lb in 2023, based on EPA TRI filings.
  • Jefferson, MT's off-site transfers rose from 0 lb in 2022 to 18 lb in 2023, based on EPA TRI filings.
  • Jefferson, MT's land releases rose from 35.7 thousand lb in 2022 to 73.7 thousand lb in 2023, based on EPA TRI filings.
  • Jefferson, MT's air releases fell from 4.9 thousand lb in 2022 to 86 lb in 2023, based on EPA TRI filings.
County population (Census ACS)
12,501
TRI Facilities
3
Water Systems
12
Superfund Sites
1
Total Releases
284.6K lbs

Water Systems (12)

System System pop (SDWIS) Violations
WHITEHALL TOWN OF 1,500 91
BOULDER CITY OF 1,400 3
SADDLE MOUNTAIN CORP CLANCY 350 0
FOREST PARK WATER USERS ASSOCIATION 323 0
BLUE SKY HEIGHTS WUA CLANCY 250 20
BASIN COUNTY WATER AND SEWER DIST 200 3
HANGMANS TREE WUA 158 0
STONEY BROOK VILLAGE CONDOMINIUM ASSOC 142 0
ELKHORN HEALTH AND REHABILITATION LLC 89 0
JEFFERSON TRACTS ASSOC INC 80 0
RED CLIFF ESTATES HOA 48 0
ROCKY MOUNTAIN WUA 30 0

TRI Facilities (3)

# Facility Total Releases
1 Barrick Gold Corp-Golden Sunlight Mine 215.1K lbs
2 Ash Grove Cement Co Montana City Plant 69.5K lbs
3 Marks-Miller Post & Pole Inc 0 lbs

Superfund Sites (1)

Site Name Status HRS Score
Basin Mining Area NPL Site 61.15

Cities in Jefferson (4)

Clancy
2 facilities · 9 water
Whitehall
1 facilities · 1 water
Basin
0 facilities · 1 water
Boulder
0 facilities · 1 water

Frequently Asked Questions

What is the environmental risk level in Jefferson, Montana? ▼
Jefferson, MT has an environmental risk score of 38/100 (Moderate Risk), based on 3 TRI facilities, 1 Superfund sites, and 12 water systems on record. 4 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Jefferson? ▼
Yes, Jefferson, MT has 1 Superfund site on the EPA National Priorities List (NPL). Superfund sites are contaminated locations that require long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
How many toxic release facilities are in Jefferson? ▼
Jefferson, MT has 3 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 284.6K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Jefferson? ▼
Air quality monitoring data (EPA AQS) is not available for Jefferson, 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 Jefferson? ▼
Jefferson, MT has 12 EPA-regulated water systems. 4 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 Jefferson? ▼
Environmental compliance in Jefferson, 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