Complaint Date | | Status | | Case |
| | Closed | | (CAA-08-2022-0004) JBS USA Food Company |
| | Active | | (CAA-08-2022-0005) Honeywell International Inc. |
| | Active | | (CAA-08-2022-0006) PacifiCorp – Jim Bridger Power Plant |
| | Active | | (CAA-08-2022-0007) Calumet Montana Refining, LLC |
| | Closed | | (CAA-08-2022-0008) WPX Energy, Inc. |
| | Active | | (CAA-08-2022-0009) Finley Resources, Inc. |
| | Active | | (CAA-08-2022-0010) Mountain Meadows Lamb Corporation (DBA Superior Farms, Inc. |
| | Closed | | (CAA-08-2023-0001) Arkoma Operations, LLC |
| | Active | | (CAA-08-2023-0002) Dyno Nobel, Inc. – Cheyenne Plant |
| | Active | | (CAA-08-2023-0003) US Magnesium LLC
|
| | Active | | (CAA-08-2023-0004) Hermes Consolidated, LLC, Par Wyoming, LLC |
| | Closed | | (CAA-08-2023-0005) Ramsdell F & M, Ltd. |
| | Closed | | (CAA-08-2023-0006) Enel Cove Fort, LLC |
| | Closed | | (CAA-08-2023-0007) JBS USA Food Company |
| | Closed | | (CAA-08-2023-0008) Suncor Energy (U.S.A.) Inc. |
| | Closed | | (CAA-08-2024-0001) Calumet Montana Refining, LLC |
| | Active | | (CAA-08-2024-0002) Dyno Nobel, Inc. - Cheyenne Plant |
| | Active | | (CAA-08-2024-0003) Uinta Wax Operating, LLC |
| | Active | | (CAA-08-2024-0004) Kraken Operating, LLC |
| | Closed | | (CERCLA-08-2001-01) Anaconda Smelter Superfund Site |
| | Closed | | (CERCLA-08-2002-0010) Anaconda Smelter Superfund Site |
| | Closed | | (CERCLA-08-2002-07) Anaconda Smelter Superfund Site |
| | Closed | | (CERCLA-08-2002-08) Anaconda Smelter Superfund Site |
| | Closed | | (CERCLA-08-2002-09) Anaconda Smelter Superfund Site |
| | Closed | | (CERCLA-08-2004-0001) Anaconda Smelter Superfund Site, Regional Water, Waste, and Soils OU, Cashman Co... |
| | Closed | | (CERCLA-08-2005-0007) Anaconda Smelter Superfund Site |
| | Active | | (CERCLA-08-2007-0010) BINGHAM MAGNA DITCHKENNECOTT UTAH COPPER CORPORATION |
| | Active | | (CERCLA-08-2008-0008) KENNECOTT UTAH COPPER CORPORATION, OM ENTERPRISES COMPANY |
| | Active | | (CERCLA-08-2014-0003) RICHARDSON FLAT TAILINGS SITE OPERABLE UNITS 2 AND 3 - UNTIED PARK CITY MINES CO... |
| | Closed | | (CERCLA-08-2022-0005) Sand Creek Superfund Site, Operable Units 3 & 6 |
| | Active | | (CERCLA-08-2022-0008) Idaho Pole Company |
| | Active | | (CERCLA-08-2022-0009) Colorado Smelter Site |
| | Active | | (CERCLA-08-2023-0001) Gilt Edge Mine Site, Agnico Eagle Mines Limited, Agnico Eagle (USA) Limited |
| | Active | | (CERCLA-08-2023-0002) Suncor Energy (U.S.A.) Inc. |
| | Active | | (CERCLA-08-2023-0003) Central City, Clear Creek Superfund Site |
| | Active | | (CERCLA-08-2023-0004) Colorado Smelter Site, Pueblo, Colorado |
| | Active | | (CERCLA-08-2024-0001) Nelson Tunnel/Commodore Waste Rock Superfund Site |
| | Active | | (CERCLA-08-2024-0002) Smeltertown Site |
| | Active | | (CERCLA-08-2024-0003) Valley Drive Abandoned Slurry Site |
| | Closed | | (CERCLA-08-91-26) Anaconda Smelter Superfund Site |
| | Active | | (CERCLA-08-93-26) Idaho Pole Company Site |
| | Closed | | (CERCLA-08-93-27) Sand Creek Operable Units No. 3 & 6 |
| | Closed | | (CERCLA-08-94-08) Anaconda Smelter Superfund Site |
| | Active | | (CERCLA-94-12) Anaconda Smelter Superfund Site, Old Works/East Anaconda Development Area Operab... |
| | Active | | (CWA-08-2008-0028) NORTHSTAR ASSOCIATES, LLC |
| | Closed | | (CWA-08-2014-0018) ROBERT GREGG SEASE |
| | Active | | (CWA-08-2021-0016) In the Matter of Phoenix Petroleum, LLC |
| | Active | | (CWA-08-2021-0018) Adminstrative Order |
| | Active | | (CWA-08-2021-0018) THE CITY OF HELENA, MONTANA |
| | Active | | (CWA-08-2022-0002) Montana Oil Supply |
| | Active | | (CWA-08-2022-0003) The Town of Fowler, Colorado |
| | Active | | (CWA-08-2022-0004) Jeremy Clark and Cari Lane, LLC |
| | Closed | | (CWA-08-2022-0006) Pale Horse Services, Inc. |
| | Closed | | (CWA-08-2022-0007) MORTON & COFFMAN, LLC dba MOUNTAIN VIEW CENEX |
| | Active | | (CWA-08-2023-0001) City of Northglenn CO |
| | Closed | | (CWA-08-2023-0002) Red Mountain Truck Lines, Inc. |
| | Closed | | (CWA-08-2023-0003) Two Medicine Water Company |
| | Closed | | (CWA-08-2023-0004) Rhinehart Oil Company |
| | Closed | | (CWA-08-2023-0005) Diana Engleman |
| | Closed | | (CWA-08-2023-0006) Blackfeet Tribe of the Blackfeet IndianReservation of Montana |
| | Active | | (CWA-08-2024-0001) Yellowstone County, Montana |
| | Active | | (CWA-08-2024-0002) Jabil Inc. |
| | Closed | | (CWA-08-2024-0003) BAILEY ENTERPRISES, INC. |
| | Active | | (CWA-08-2024-0004) Pit Stop Oil, LLC |
| | Closed | | (EPCRA-08-2017-0001) CLOVERDALE FOODS COMPANY |
| | Closed | | (EPCRA-08-2022-0003) Calumet Montana Refining LLC |
| | Closed | | (EPCRA-08-2023-0002) Suncor Energy (U.S.A.) Inc. |
| | Active | | (EPCRA-08-2023-01) Dyno Nobel Cheyenne Inc., Plant |
| | Closed | | (FIFRA-08-2015-0003) sBIOMED, LLC. |
| | Closed | | (FIFRA-08-2021-0059) BUSSEMF SEWAGE TREATMENT DEVICES |
| | Active | | (FIFRA-08-2022-0024) Atlantium Technologies Ltd |
| | Closed | | (FIFRA-08-2022-0025) High Tech Health International |
| | Closed | | (FIFRA-08-2022-0026 and .....) Bayer Crop Science LP |
| | Closed | | (FIFRA-08-2022-0027) Comfort Wall |
| | Closed | | (FIFRA-08-2022-0028) High Tech Health International, Inc. |
| | Closed | | (FIFRA-08-2022-0029) High Tech Health International, Inc. |
| | Closed | | (FIFRA-08-2022-0030) Canature Watergroup USA Inc. |
| | Closed | | (FIFRA-08-2022-0031) Clean Membranes Inc. |
| | Closed | | (FIFRA-08-2022-0032) The Tunneling Company USA |
| | Closed | | (FIFRA-08-2022-0033) Sterilumen, Inc. |
| | Closed | | (FIFRA-08-2022-0034) Quality Performance Limited Corporation |
| | Closed | | (FIFRA-08-2022-0035) Quality Performance Limited Corporation |
| | Closed | | (FIFRA-08-2022-0036) Quality Performance Limited Corporation |
| | Closed | | (FIFRA-08-2022-0037 and .....) U.S. Department of Homeland Security Bureau of Customs and Border Protection |
| | Closed | | (FIFRA-08-2022-0038 and .....) Nufarm Americas, Inc. |
| | Closed | | (FIFRA-08-2022-0039 and .....) Sterilumen, Inc. |
| | Closed | | (FIFRA-08-2022-0040 and .....) Anesta LLC |
| | Closed | | (FIFRA-08-2022-0041) Airtime Aerial, LLC |
| | Active | | (FIFRA-08-2022-0042) U.S. Department of Homeland Security Bureau of Customs and Border Protection |
| | Closed | | (FIFRA-08-2022-0043) CARE.LIFE, INC.
|
| | Active | | (FIFRA-08-2022-0044) U.S. Department of Homeland Security Bureau of Customs and Border Protection |
| | Active | | (FIFRA-08-2022-0045) Luma Hydration Inc.
|
| | Closed | | (FIFRA-08-2022-0046) U.S. Department of Homeland Security Bureau of Customs and Border Protection |
| | Closed | | (FIFRA-08-2022-0047) U.S. Department of Homeland Security Bureau of Customs and Border Protection |
| | Active | | (FIFRA-08-2022-0048) U.S. Department of Homeland Security Bureau of Customs and Border Protection |
| | Closed | | (FIFRA-08-2023-0001) Luma Hydration Inc |
| | Closed | | (FIFRA-08-2023-0002) U.S. Department of Homeland Security Bureau of Customs and Border Protection |
| | Closed | | (FIFRA-08-2023-0003) U.S. Department of Homeland Security Bureau of Customs and Border Pr |
| | Closed | | (FIFRA-08-2023-0004) Synergy Science, Inc. |
| | Closed | | (FIFRA-08-2023-0005) Wintersteiger Inc. |