Sheridan, WY
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 Wyoming · Population: 31,585
TRI sites such as L&h Industrial Inc.; SDWIS systems such as SHERIDAN, CITY OF; RANCHESTER, TOWN OF; DAYTON, TOWN OF anchor Sheridan, WY's EPA extract. Derived burden score 10/100 (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 Sheridan include SHERIDAN, CITY OF; VETERANS ADMINISTRATION MEDICAL CENTER; KEY LARGO UTILITIES, while L&h Industrial Inc. leads reported TRI pounds among local Form R filers. AQS median AQI 44 / peak 205 in 2024.
Burden score 10/100 (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.
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 | 281 (77%) | 69 | 9 | 205 |
| 2023 | 283 (78%) | 79 | 2 | 175 |
| 2022 | 270 (74%) | 95 | 0 | 90 |
| 2021 | 302 (83%) | 55 | 7 | 115 |
| 2020 | 334 (91%) | 32 | 0 | 100 |
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 Wyoming, see the EPA's AirNow.gov.
Water Systems (7)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| SHERIDAN, CITY OF | 22,700 | 1 |
| RANCHESTER, TOWN OF | 1,297 | 0 |
| DAYTON, TOWN OF | 824 | 0 |
| VETERANS ADMINISTRATION MEDICAL CENTER | 685 | 5 |
| DOWNER NEIGHBORHOOD I&S DISTRICT | 400 | 0 |
| CLEARMONT, TOWN OF | 116 | 0 |
| KEY LARGO UTILITIES | 105 | 11 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | L&h Industrial Inc. | 1 lbs |
Cities in Sheridan (4)
Frequently Asked Questions
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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.