TRI Facilities
78
Moderate
WY · EPA TRI · SDWIS · Superfund
Wyoming environmental disclosure record
According to EPA's 2023 Toxics Release Inventory, Safe Drinking Water Information System, and Superfund National Priorities List extracts, this is Wyoming's full public registry profile, toxic releases, drinking-water systems, and Superfund sites in one place.
- TRI facilities
- 78
- Reported releases
- 93.9M lbs
- #36 of 56
- Water systems
- 317
- Superfund NPL sites
- 3
Wyoming vs. every U.S. state
Cumulative TRI-reported release pounds, with this state marked in the national distribution
94M lbs 36th percentile higher than 36% of 56 states with TRI reporters
Each bar is a $1M-wide band; taller bars hold more states with TRI reporters. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
WY regulatory profile by statute
Violation/site counts mapped to the EPA statutes this portal tracks
- CWA · NPDES
- RCRA · Subtitle C 3
What this shows Counts are mapped to statute as a structural proxy and reflect reported activity, not toxicity-weighted or population-adjusted risk. Clean Air Act (Title V) permit data is not currently ingested by this portal, so air-permit compliance is not shown here.
How Wyoming compares across two EPA disclosure measures
The highlighted point is Wyoming. The vertical axis is the share of tracked water systems with at least one health-based SDWIS record; the horizontal axis is TRI-reported pounds per facility on a logarithmic scale so the full state distribution stays readable. The crosshairs use the portal’s published national benchmark medians.
This matrix compares disclosure rates, not toxicity, exposure, current compliance, or drinking-water safety. A lower position on either axis is not a safety rating; use the underlying facility and water-system records for context.
According to EPA TRI, SDWIS, and Superfund NPL extracts, Wyoming (WY) lists 78 TRI-reporting facilities disclosing 93.9M lbs of toxic releases. The same extracts list 3 Superfund sites and 317 EPA-regulated water systems, of which 123 carry health-based SDWIS violation rows. PlainEnviro's composite environmental health score for Wyoming is 48/100 (grade F), benchmarked against all U.S. states on chemical release intensity, drinking-water health violations, Superfund site burden, and water violation rate. This is a percentile-derived composite from federal disclosure counts, not a clinical health-risk assessment.
F 48
Wyoming Environmental Health Score
A percentile-benchmarked 0–100 composite from 4 EPA federal datasets, with weight redistribution for any unavailable dimension
Chemical Release Intensity F 38
1.2M (lbs per facility) Drinking Water Health Violations F 52
38.8% (% of systems) Superfund Site Burden F 37
3.8 (sites per 100 facilities) Water Violation Rate D 67
2.3 (violations per system) Benchmarks derived from EPA TRI, SDWIS, and Superfund NPL extracts across all 56 U.S. states and territories
Water Systems
317
Low
Superfund Sites
3
Very low
Total Releases
93.9M lbs
High
Compliance Snapshot - WY
Sites with no recorded health violations 68.9%
Sites with at least one open violation 31.1%
Wyoming's profile joins three independently maintained EPA programs into one statewide record: the Toxics Release Inventory (TRI, EPCRA Section 313 industrial disclosures), the Safe Drinking Water Information System (SDWIS, Safe Drinking Water Act compliance), and the Superfund National Priorities List. Each program uses its own reporting cadence and facility-identification scheme; PlainEnviro joins them by matched facility and system location rather than a shared federal ID, so a site absent from one program is never assumed absent from another. The counts below reflect the portal's rebuild as of August 2026.
Activity clusters in counties such as Teton, Natrona, Lincoln, which account for the highest combined facility, water-system, and Superfund presence. Monitoring and reporting violations are not included in the SDWIS counts shown here.
Every figure reflects the public regulatory record as filed with the U.S. Environmental Protection Agency and is not weighted for toxicity, geographic footprint, or population exposure. A state can rank high in any individual metric because of industrial history, naturally occurring contaminants in source water, or simply the number of reporting facilities, not because current residents face unsafe conditions. Drill into any county or water system below for the full disclosure record.
What does this state's environmental record show?
TRI Facilities
78
Water Systems
317
Superfund Sites
3
Health-Based Violation Records
730
Total Releases
93.9M lbs
cumulative, all reported years
Systems with Records
123
water systems
Release-over-release change
What changed for Wyoming: EPA TRI 2023 reporting year
Same facilities, both years
+9.3%
60 facilities that filed in 2022 and 2023
Whole inventory
+10.0%
19.1 million lb → 21.0 million lb, every facility that filed
Between the two reporting years, 4 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Wyoming's total reported releases rose from 19.1 million lb in 2022 to 20.9 million lb in 2023, based on EPA TRI filings.
- Wyoming's land releases rose from 14.3 million lb in 2022 to 15.9 million lb in 2023, based on EPA TRI filings.
- Wyoming's water releases rose from 1.9 thousand lb in 2022 to 2.0 thousand lb in 2023, based on EPA TRI filings.
- Wyoming's air releases rose from 2.3 million lb in 2022 to 2.4 million lb in 2023, based on EPA TRI filings.
Largest Polluters
View all →| # | Facility | Total Releases |
|---|---|---|
| 1 | Dyno Nobel Inc-Cheyenne Plant | 27.1M lbs |
| 2 | Basin Electric Laramie River Station | 13.0M lbs |
| 3 | Simplot Phosphates LLC | 10.3M lbs |
| 4 | Black Hills Corp - Neil Simpson Complex | 8.7M lbs |
| 5 | Pacificorp Dave Johnston Plant | 8.2M lbs |
| 6 | Pacificorp Jim Bridger Plant & Bridger Coal Co | 6.7M lbs |
| 7 | Basin Electric Dry Fork Station | 5.4M lbs |
| 8 | Pacificorp Wyodak Plant | 4.0M lbs |
| 9 | Pacificorp Naughton Plant | 2.4M lbs |
| 10 | Hf Sinclair Parco Refining LLC | 1.5M lbs |
| 11 | Crown Beverage Packaging | 1.4M lbs |
| 12 | Blacks Fork Gas Plant | 1.1M lbs |
| 13 | Steamboat Processing Facility | 1.0M lbs |
| 14 | Western Gas Resources Hilight Gas Plant | 993.2K lbs |
| 15 | Cheyenne Renewable Diesel Co LLC | 241.6K lbs |
| 16 | Echo Springs Gas Plant | 235.3K lbs |
| 17 | Opal Gas Plant | 213.0K lbs |
| 18 | Wyoming Sugar Co | 195.4K lbs |
| 19 | Carter Creek Gas Plant | 178.8K lbs |
| 20 | US Army Camp Guernsey Training Areas | 178.1K lbs |
Water Quality
Systems with Health Violations
| Water System | Population | Violations |
|---|---|---|
| DIXON, TOWN OF | 114 | 93 |
| LANCE CREEK WATER DISTRICT | 45 | 64 |
| BAGGS, TOWN OF | 400 | 50 |
| KEMMERER-DIAMONDVILLE JPB | 3,348 | 35 |
| COTTONWOOD ACRES | 95 | 30 |
| STONE CREEK HOA | 100 | 30 |
| LITTLE AMERICA HOTELS & RESORTS, INC- WY | 2,004 | 26 |
| YNP-OLD FAITHFUL | 7,675 | 26 |
| BUFFALO, CITY OF | 4,419 | 20 |
| COKEVILLE, TOWN OF | 535 | 17 |
| BENNOR ESTATES & IMPROVEMENT DISTRICT | 144 | 13 |
| KEY LARGO UTILITIES | 105 | 11 |
| ETHETE WATER SYSTEM | 1,950 | 10 |
| RIVERMEADOWS WATER DISTRICT | 100 | 10 |
| RED WATER DISTRIBUTION LLC | 35 | 9 |
| MILLS, CITY OF | 4,050 | 9 |
| BROKEN WRENCH LLC | 30 | 9 |
| RAWLINS WATER SUPPLY, CITY OF | 9,006 | 8 |
| POTLATCH TRAILER COURT | 70 | 8 |
| RIMROCK WATER COMPANY LLC | 365 | 7 |
Cities with Water Issues
Gillette
47 water systems
Wilson
20 water systems
Cheyenne
14 water systems
Casper
13 water systems
Jackson
12 water systems
Rock Springs
11 water systems
Grover
9 water systems
Pavillion
8 water systems
Laramie
7 water systems
Newcastle
7 water systems
Torrington
6 water systems
Thermopolis
5 water systems
Cody
4 water systems
Green River
4 water systems
Mills
4 water systems
Riverton
4 water systems
Sheridan
4 water systems
Moose
3 water systems
Alpine
3 water systems
Cowley
3 water systems
Superfund Sites (3)
| Site Name | Status | HRS Score |
|---|---|---|
| Baxter/Union Pacific Tie Treating | Deleted NPL Site | 37.24 |
| F.E. Warren Air Force Base | NPL Site | 39.23 |
| Mystery Bridge Rd/U.S. Highway 20 | Deleted NPL Site | 32.10 |
Counties (23 total)
| County | Facilities |
|---|---|
| Teton | 1 |
| Natrona | 12 |
| Lincoln | 3 |
| Sweetwater | 11 |
| Fremont | 1 |
| Laramie | 9 |
| Big Horn | 3 |
| Campbell | 9 |
| Converse | 8 |
| Park | 4 |
| Carbon | 3 |
| Albany | 2 |
| Goshen | 0 |
| Weston | 1 |
| Sheridan | 1 |
| Uinta | 5 |
| Hot Springs | 0 |
| Platte | 2 |
| Washakie | 2 |
| Crook | 0 |
Showing top 20 counties by environmental activity. Wyoming has 23 counties total.
Cities with Environmental Records
Gillette
9 facilities · 47 water systems
Cheyenne
8 facilities · 14 water systems
Casper
6 facilities · 13 water systems
Rock Springs
6 facilities · 11 water systems
Douglas
6 facilities · 6 water systems
Evanston
5 facilities · 2 water systems
Evansville
5 facilities · 2 water systems
Lovell
3 facilities · 1 water systems
Laramie
2 facilities · 7 water systems
Cody
2 facilities · 4 water systems
Worland
2 facilities · 4 water systems
Glenrock
2 facilities · 1 water systems
Granger
2 facilities · 1 water systems
Opal
2 facilities · 1 water systems
Point Of Rocks
2 facilities · 1 water systems
Newcastle
1 facilities · 7 water systems
Green River
1 facilities · 4 water systems
Mills
1 facilities · 4 water systems
Riverton
1 facilities · 4 water systems
Sheridan
1 facilities · 4 water systems
Frequently Asked Questions
How many TRI facilities are in Wyoming? ▼
Wyoming has 78 facilities that report to the EPA Toxic Release Inventory (TRI). These facilities have collectively reported 93.9M lbs in total toxic chemical releases. TRI data is self-reported annually by facilities that manufacture, process, or use listed toxic chemicals above threshold amounts.
Does Wyoming have Superfund sites? ▼
Yes, Wyoming has 3 sites on the EPA Superfund National Priorities List (NPL). Superfund sites are contaminated locations identified for long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
What does EPA SDWIS list for drinking water in Wyoming? ▼
Wyoming has 317 EPA-regulated water systems in the Safe Drinking Water Information System (SDWIS) extract used here. 123 water systems have a health-based violation row (MCL exceedance) in this historical extract. A past registry row is not a current drinkability verdict. For current utility conditions, contact the local water utility or the Wyoming drinking water program. Source: EPA SDWIS.
What environmental data is available for Wyoming? ▼
PlainEnviro provides three categories of EPA environmental data for Wyoming: Toxic Release Inventory (TRI) data covering 78 industrial facilities, Safe Drinking Water Information System (SDWIS) data for 317 water systems, and Superfund National Priorities List (NPL) data for 3 contaminated sites.
How does Wyoming compare to other states on EPA disclosure counts? ▼
Wyoming has 78 TRI facilities with 93.9M lbs in total releases, 3 Superfund sites, and 730 water system violations on record. These are federal disclosure counts; they are not toxicity-weighted or population-adjusted risk scores. Source: EPA TRI, SDWIS, and Superfund NPL databases.
What is Wyoming's environmental health score? ▼
PlainEnviro's composite environmental health score for Wyoming is 48/100 (grade F). This score combines four percentile-benchmarked dimensions from EPA federal extracts: chemical release intensity per TRI facility, drinking-water health violation rate from SDWIS, Superfund site burden relative to industrial activity, and overall water violation rate. Scores are benchmarked against all 56 U.S. states and territories. When a dimension lacks data, its weight redistributes to the remaining dimensions so the score never deflates from missing inputs. This is a registry-count composite, not a clinical exposure or health-outcome assessment.
Explore More Data for Wyoming
TRI Facilities in Wyoming →
Every toxic-release facility reporting in the state, ranked by volume
Drinking Water Systems in Wyoming →
Community water systems and their violation records
Air Quality in Wyoming →
County-level AQI from EPA monitoring stations
Compare states by burden →
EJ screening scores for every U.S. county
State environmental rankings →
How states compare on releases, water and Superfund
Browse all states →
Environmental profiles for every U.S. state
About This Data
This page aggregates environmental data from three EPA programs for Wyoming: the Toxic Release Inventory (TRI) for industrial chemical releases, the Safe Drinking Water Information System (SDWIS) for water quality, and the Superfund National Priorities List (NPL) for hazardous waste cleanup sites.
PlainEnviro presents this data without advocacy framing. Numbers reflect reported data and may not capture all environmental activity. For specific health or environmental concerns, contact your state environmental agency.
What to do with Wyoming's data
Use this state profile as a starting point, then drill into the specific dataset that matters to you.
- Check the 78 TRI facilities reporting in Wyoming for the largest reported releases near a specific county. View facilities
- 123 water systems in the state have a recorded health-based violation, check if yours is one of them. Check water systems
- See how Wyoming compares to other states on releases, water violations, and Superfund sites. State rankings
Reported data reflects what facilities and agencies disclose to the EPA; it is not a complete measure of environmental risk or a substitute for local guidance.
Use and verify this record
Wyoming's profile brings together EPA release, drinking-water, and Superfund records. It reports the underlying programs without making a health or environmental-risk determination.
State environmental figures are computed directly from EPA data. The methodology records the joins, definitions, and refresh cadence for each program.
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.