Sublette, 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 Sublette in Wyoming · Population: 8,806
TRI sites such as Championx-Boulder; SDWIS systems such as PINEDALE MUNICIPAL WS; MARBLETON, TOWN OF; HIGH MEADOW RANCH anchor Sublette, 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 Sublette include PINEDALE MUNICIPAL WS; MARBLETON, TOWN OF; BIG PINEY, TOWN OF, while Championx-Boulder leads reported TRI pounds among local Form R filers. AQS median AQI 46 / peak 115 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 Sublette -- 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 | 244 (67%) | 115 | 7 | 115 |
| 2023 | 237 (65%) | 122 | 6 | 122 |
| 2022 | 301 (82%) | 63 | 1 | 105 |
| 2021 | 253 (69%) | 105 | 7 | 133 |
| 2020 | 289 (79%) | 72 | 4 | 151 |
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 (4)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| PINEDALE MUNICIPAL WS | 1,900 | 1 |
| MARBLETON, TOWN OF | 861 | 3 |
| HIGH MEADOW RANCH | 580 | 0 |
| BIG PINEY, TOWN OF | 445 | 1 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Championx-Boulder | 0 lbs |
Cities in Sublette (4)
Frequently Asked Questions
What is the environmental risk level in Sublette, Wyoming? ▼
Are there Superfund sites in Sublette? ▼
How many toxic release facilities are in Sublette? ▼
What is the air quality in Sublette? ▼
Is the drinking water safe in Sublette? ▼
What environmental agencies cover Sublette? ▼
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.