Sheridan, 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 Sheridan in Montana · Population: 3,677
TRI sites such as US Cbp Raymond Port of Entry Be# MT0050; SDWIS systems such as PLENTYWOOD WATER DEPARTMENT; MEDICINE LAKE TOWN OF; WESTBY TOWN OF anchor Sheridan, MT's EPA extract. Derived burden score 7/100 (Low Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
US Cbp Raymond Port of Entry Be# MT0050 is among the largest Form R filers reporting in Sheridan; no SDWIS system here carries an active health-based flag. AQS median AQI 17 / peak 126 in 2024.
Burden score 7/100 (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 Sheridan -- 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 Sheridan, MT: EPA TRI 2023 reporting year
Same facilities, both years
-100.0%
1 facilities that filed in 2022 and 2023
Whole inventory
-100.0%
11 lb → 0 lb, every facility that filed
- Sheridan, MT's total reported releases fell from 11 lb in 2022 to 0 lb in 2023, based on EPA TRI filings.
- Sheridan, MT's off-site transfers fell from 11 lb in 2022 to 0 lb in 2023, based on EPA TRI filings.
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 | 104 (87%) | 13 | 2 | 126 |
| 2023 | 96 (86%) | 12 | 3 | 160 |
| 2022 | 85 (96%) | 4 | 0 | 66 |
| 2021 | 108 (90%) | 12 | 0 | 98 |
| 2020 | 103 (96%) | 4 | 0 | 58 |
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 |
|---|---|---|
| PLENTYWOOD WATER DEPARTMENT | 1,700 | 0 |
| MEDICINE LAKE TOWN OF | 600 | 0 |
| WESTBY TOWN OF | 172 | 0 |
| OUTLOOK COUNTY SEWER AND WATER | 96 | 0 |
| ANTELOPE COUNTY WATER AND SEWER | 59 | 0 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | US Cbp Raymond Port of Entry Be# MT0050 | 167 lbs |
Cities in Sheridan (6)
Frequently Asked Questions
What is the environmental risk level in Sheridan, Montana? ▼
Are there Superfund sites in Sheridan? ▼
How many toxic release facilities are in Sheridan? ▼
What is the air quality in Sheridan? ▼
Is the drinking water safe in Sheridan? ▼
What environmental agencies cover Sheridan? ▼
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.