Sweetwater, 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. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.
Environmental data for Sweetwater in Wyoming · Population: 41,786
TRI sites such as Simplot Phosphates LLC; Pacificorp Jim Bridger Plant & Bridger Coal Co; Blacks Fork Gas Plant; SDWIS systems such as ROCK SPRINGS, CITY OF; GREEN RIVER, CITY OF; LITTLE AMERICA HOTELS & RESORTS, INC- WY anchor Sweetwater, WY's EPA extract. Derived burden score 53/100 (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 Sweetwater include LITTLE AMERICA HOTELS & RESORTS, INC- WY; FARSON EDEN SCHOOL; WAMSUTTER, TOWN OF, while Simplot Phosphates LLC leads reported TRI pounds among local Form R filers. AQS median AQI 45 / peak 137 in 2024.
Burden score 53/100 (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 Sweetwater -- 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 Sweetwater, WY: EPA TRI 2023 reporting year
Same facilities, both years
+229.3%
7 facilities that filed in 2022 and 2023
Whole inventory
-0.4%
3.9 million lb → 3.9 million lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Sweetwater, WY's off-site transfers rose from 264.9 thousand lb in 2022 to 872.3 thousand lb in 2023, based on EPA TRI filings.
- Sweetwater, WY's land releases fell from 3.2 million lb in 2022 to 2.6 million lb in 2023, based on EPA TRI filings.
- Sweetwater, WY's chemicals reported fell from 38 in 2022 to 33 in 2023, based on EPA TRI filings.
- Sweetwater, WY's air releases fell from 430.8 thousand lb in 2022 to 419.4 thousand 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 | 247 (67%) | 109 | 10 | 137 |
| 2023 | 253 (69%) | 103 | 8 | 211 |
| 2022 | 285 (78%) | 78 | 1 | 157 |
| 2021 | 238 (65%) | 117 | 9 | 195 |
| 2020 | 235 (64%) | 119 | 7 | 1334 |
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 (18)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| ROCK SPRINGS, CITY OF | 24,000 | 0 |
| GREEN RIVER, CITY OF | 10,500 | 0 |
| LITTLE AMERICA HOTELS & RESORTS, INC- WY | 2,004 | 26 |
| PIONEER MOBILE HOME PARK | 1,000 | 0 |
| JAMESTOWN-RIO VISTA W&S DISTRICT | 560 | 0 |
| FARSON EDEN SCHOOL | 530 | 1 |
| WAMSUTTER, TOWN OF | 500 | 3 |
| LEWIS MOBILE HOME PARK | 370 | 0 |
| SUPERIOR, TOWN OF | 336 | 2 |
| HORIZON MHP | 330 | 0 |
| WHITE MOUNTAIN MOBILE HOME PARK | 270 | 0 |
| GRANGER, TOWN OF | 139 | 6 |
| DESERT TRAILS MHP | 112 | 0 |
| MOBILE CORRALS MHP | 110 | 0 |
| POINT OF ROCKS MERCANTILE | 78 | 1 |
| BAIROIL, TOWN OF | 71 | 1 |
| ROCK SPRINGS/GREEN RIVER JPB | 25 | 3 |
| FARSON MOBILE HOME COURT | 20 | 0 |
TRI Facilities (11)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Simplot Phosphates LLC | 10.3M lbs |
| 2 | Pacificorp Jim Bridger Plant & Bridger Coal Co | 6.7M lbs |
| 3 | Blacks Fork Gas Plant | 1.1M lbs |
| 4 | Granger Gas Plant | 46.0K lbs |
| 5 | Vermillion Gas Plant | 32.6K lbs |
| 6 | Black Butte Coal Co | 530 lbs |
| 7 | Church & Dwight Co Inc | 111 lbs |
| 8 | P4 Production LLC | 104 lbs |
| 9 | Lewis & Lewis Inc Asphalt Paving | 2 lbs |
| 10 | Sunroc Corp - Lagoon Drive Ready Mix | 0 lbs |
| 11 | Western Refining -Dba Pilot Thomas Logistics - Rock Springs | 0 lbs |
Cities in Sweetwater (8)
Frequently Asked Questions
What is the environmental risk level in Sweetwater, Wyoming? ▼
Are there Superfund sites in Sweetwater? ▼
How many toxic release facilities are in Sweetwater? ▼
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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.