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Custer, MT

Low Risk (14/100)

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 Custer in Montana · Population: 11,938

TRI sites such as Pfp Industries LLC - Miles City Mt Facility; Western Powders Inc / Hodgdon Powder Co.; SDWIS systems such as MILES CITY CITY OF; CUSTER CO WATER AND SEWER DIST; PINE HILLS YOUTH CORRECT FACIL anchor Custer, MT's EPA extract. Derived burden score 14/100 (Low 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 Custer include MILES CITY CITY OF; PALISADES APARTMENTS, while Pfp Industries LLC - Miles City Mt Facility leads reported TRI pounds among local Form R filers. AQS median AQI 36 / peak 153 in 2024.

Burden score 14/100 (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 Custer -- 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 Custer, MT: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

not comparable

2 facilities that filed in 2022 and 2023

Whole inventory

not comparable

0 lb → 250 lb, every facility that filed

  • Custer, MT's total reported releases rose from 0 lb in 2022 to 250 lb in 2023, based on EPA TRI filings.
  • Custer, MT's air releases rose from 0 lb in 2022 to 250 lb in 2023, based on EPA TRI filings.
County population (Census ACS)
11,938
TRI Facilities
2
Water Systems
5
Superfund Sites
0
Total Releases
250 lbs

Air Quality History (2022–2024)

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 328 (91%) 31 0 153
2023 288 (79%) 66 4 260
2022 318 (87%) 46 0 80
2024 Good Air Quality: 91% of days
Unhealthy days: 2
Median AQI: 36

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 (5)

System System pop (SDWIS) Violations
MILES CITY CITY OF 9,565 10
CUSTER CO WATER AND SEWER DIST 480 0
PINE HILLS YOUTH CORRECT FACIL 193 0
SHEPHERD WATER STATION 100 0
PALISADES APARTMENTS 50 13

TRI Facilities (2)

# Facility Total Releases
1 Pfp Industries LLC - Miles City Mt Facility 250 lbs
2 Western Powders Inc / Hodgdon Powder Co. 0 lbs

Cities in Custer (1)

Miles City
2 facilities · 5 water

Frequently Asked Questions

What is the environmental risk level in Custer, Montana? ▼
Custer, MT has an environmental risk score of 14/100 (Low Risk), based on 2 TRI facilities, 0 Superfund sites, and 5 water systems on record. 2 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Custer? ▼
No Superfund National Priorities List (NPL) sites are currently registered in Custer, MT in the EPA database.
How many toxic release facilities are in Custer? ▼
Custer, MT has 2 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 250 lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Custer? ▼
In 2024, Custer, MT recorded a median AQI of 36 and a peak AQI of 153. 91% of monitored days had "Good" air quality (AQI 0–50). Source: EPA Air Quality System (AQS) Annual AQI by County.
Is the drinking water safe in Custer? ▼
Custer, MT has 5 EPA-regulated water systems. 2 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 Custer? ▼
Environmental compliance in Custer, 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