Environmental compliance
Environmental compliance in Wyoming
5,054 active EPA-regulated sites in Wyoming: 493 with an identified violation, 86 in significant violation, $7.0 million in penalties over five years — EPA ECHO, as of October 18, 2026, by county and facility.
How many facilities in Wyoming are regulated by the EPA, and how many are in violation (as of October 18, 2026)?
How many active facilities in Wyoming fall under each EPA program?
A facility can be in several programs.
| Program | Active sites |
|---|---|
| Air (Clean Air Act) | 673 |
| Water discharge permits (Clean Water Act, NPDES) | 1,747 |
| Hazardous waste (RCRA) | 2,128 |
| Drinking water systems (SDWA) | 650 |
| Toxics Release Inventory reporters | 62 |
| Greenhouse gas reporters (GHGRP) | 37 |
Which counties in Wyoming have the most facilities in significant violation of EPA rules?
Which large facilities in Wyoming are in significant violation of EPA rules?
| Facility | Compliance status | Quarters in violation (of 12) | Penalties, 5 years |
|---|---|---|---|
| HF SINCLAIR PARCO REFINING CO LLC Sinclair, WY | Significant Violation | 12 | $431,500 |
| BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) Sweetwater County, WY | Significant Violation | 12 | $34,000 |
| SINCLAIR OIL CORP. - CASPER, WYOMING REFINERY Casper, WY | Significant Violation | 12 | – |
| MOUNTAIN CEMENT CO Laramie, WY | Significant Violation | 12 | – |
| LANDER WASTEWATER LAGOON Lander, WY | Significant Violation | 10 | – |
| BASIN ELECTRIC POWER COOPERATIVE - LARAMIE RIVER STATION Wheatland, WY | Significant Violation | 9 | $45,000 |
| LOST CABIN GAS PLANT Lysite, WY | Significant Violation | 9 | $15,000 |
| DYNO NOBEL INC-CHEYENNE PLANT Cheyenne, WY | Significant Violation | 4 | $415,258 |
| EXXONMOBIL PRODUCTION - SHUTE CREEK FACILITY Kemmerer, WY | Significant Violation | 1 | – |
Which large facilities in Wyoming had the highest environmental penalties in the last five years?
| Facility | Compliance status | Quarters in violation (of 12) | Penalties, 5 years |
|---|---|---|---|
| HF SINCLAIR PARCO REFINING CO LLC Sinclair, WY | Significant Violation | 12 | $431,500 |
| DYNO NOBEL INC-CHEYENNE PLANT Cheyenne, WY | Significant Violation | 4 | $415,258 |
| GENERAL CHEMICAL Green River, WY | No Violation Identified | 7 | $95,000 |
| BASIN ELECTRIC POWER COOPERATIVE - LARAMIE RIVER STATION Wheatland, WY | Significant Violation | 9 | $45,000 |
| BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) Sweetwater County, WY | Significant Violation | 12 | $34,000 |
| FMC WYOMING CORPORATION - GREEN RIVER WYOMING FACILITY Green River, WY | No Violation Identified | 5 | $15,400 |
| LOST CABIN GAS PLANT Lysite, WY | Significant Violation | 9 | $15,000 |
| SOLVAY SODA ASH JOINT VENTURE Green River, WY | No Violation Identified | 1 | $12,000 |
| SUNMARK EXPL CO ECHO SPRINGS FED 1-1 Unk, WY | No Violation Identified | 1 | $7,000 |
| WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) Rock Springs, WY | No Violation Identified | 0 | $5,000 |
| ELK BASIN GAS PLANT Powell, WY | No Violation Identified | 1 | $4,000 |
| RIVERTON WWTF Riverton, WY | No Violation Identified | 4 | $1,400 |
EPA Enforcement and Compliance History Online (ECHO), weekly national export. Counts cover active sites in the Facility Registry Service; inspections, formal actions and penalties cover the last five years, quarters in violation the last three years. The EPA attributes a case that covers several facilities to each of them; area penalty totals here count an amount shared through the same federal case once, facility figures show the amount attributed to that facility. Large facilities are Clean Air Act majors, Clean Water Act majors and large hazardous waste generators or handlers. Source record.
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