Big Horn, 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 Big Horn in Wyoming · Population: 11,737
TRI sites such as Western Sugar Cooperative Lovell Factory; Georgia-Pacific Gypsum LLC - Lovell Plant; Cetco; SDWIS systems such as LOVELL, TOWN OF; GREYBULL, TOWN OF; BASIN, TOWN OF anchor Big Horn, WY's EPA extract. Derived burden score 26/100 (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 Big Horn include COWLEY, TOWN OF; BURLINGTON, TOWN OF; MANDERSON, TOWN OF, while Western Sugar Cooperative Lovell Factory leads reported TRI pounds among local Form R filers. AQS median AQI 39 / peak 119 in 2024.
Burden score 26/100 (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 Big Horn -- 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 Big Horn, WY: EPA TRI 2023 reporting year
Same facilities, both years
+26.4%
2 facilities that filed in 2022 and 2023
Whole inventory
+26.4%
32.2 thousand lb → 40.6 thousand lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Big Horn, WY's total reported releases rose from 32.2 thousand lb in 2022 to 40.6 thousand lb in 2023, based on EPA TRI filings.
- Big Horn, WY's air releases rose from 31.6 thousand lb in 2022 to 39.9 thousand lb in 2023, based on EPA TRI filings.
- Big Horn, WY's land releases rose from 487 lb in 2022 to 610 lb in 2023, based on EPA TRI filings.
- Big Horn, WY's water releases rose from 97 lb in 2022 to 107 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 | 315 (89%) | 36 | 2 | 119 |
| 2023 | 335 (93%) | 24 | 0 | 77 |
| 2022 | 356 (98%) | 6 | 0 | 64 |
| 2021 | 324 (89%) | 39 | 1 | 101 |
| 2020 | 349 (97%) | 8 | 2 | 126 |
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 (15)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| LOVELL, TOWN OF | 2,250 | 0 |
| GREYBULL, TOWN OF | 2,080 | 0 |
| BASIN, TOWN OF | 1,250 | 0 |
| COWLEY, TOWN OF | 800 | 2 |
| BYRON, TOWN OF | 561 | 0 |
| BURLINGTON, TOWN OF | 348 | 7 |
| DEAVER MUNICIPAL WATER SYSTEM | 176 | 0 |
| FRANNIE, TOWN OF | 160 | 0 |
| SOUTH END WATER USERS S&I DISTRICT | 150 | 0 |
| SHELL TOWN WATER IMPROVEMENT DISTRICT | 120 | 0 |
| MANDERSON, TOWN OF | 110 | 2 |
| GREYBULL HEIGHTS WATER USERS | 84 | 0 |
| HYATTVILLE S&I DISTRICT | 60 | 0 |
| SCHAREN SUBDIVISION | 50 | 0 |
| SHOSHONE MUNICIPAL PIPELINE | 25 | 0 |
TRI Facilities (3)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Western Sugar Cooperative Lovell Factory | 116.4K lbs |
| 2 | Georgia-Pacific Gypsum LLC - Lovell Plant | 159 lbs |
| 3 | Cetco | 0 lbs |
Cities in Big Horn (9)
Frequently Asked Questions
What is the environmental risk level in Big Horn, Wyoming? ▼
Are there Superfund sites in Big Horn? ▼
How many toxic release facilities are in Big Horn? ▼
What is the air quality in Big Horn? ▼
Is the drinking water safe in Big Horn? ▼
What environmental agencies cover Big Horn? ▼
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.