St. Clair County contains 145 EPA-regulated facilities, 10 of which are currently flagged for significant noncompliance. The county also hosts 0 Superfund sites and 19 TRI chemical reporters. EPA has assessed $5.3M in lifetime penalties and TRI reporters disclosed roughly 1.5M lb of on-site releases. That facility count is well above the Michigan state average of 57 per county.
| Facility | City | On-site (lb) | Status |
|---|---|---|---|
| Belle River Berm Project | China | 755.9k | Compliant |
| Intertape Polymer Group | Marysville | 637.5k | Compliant |
| Magna Electric Vehicle Structures | Saint Clair | 27.4k | Compliant |
| Marysville Hydrocarbons, Llc. | Marysville | 16.2k | Compliant |
| K&k Screw Products Llc | East China | 15.2k | Compliant |
| Sunsation Products Inc | Algonac | 10.7k | Compliant |
| Michigan Metal Coatings | Port Huron | 5.8k | Compliant |
| Samvardhana Motherson Reflectic | Marysville | 659 | Compliant |
| Zf Axle Drives Marysville | Marysville | 159 | Compliant |
| Michigan Metal Coatings Plant 2 | Port Huron | 108 | Compliant |
| Wirtz Mfg Co Inc Plant 1 | Port Huron | 3 | Compliant |
| Facility | City | Penalties | Last Inspected |
|---|---|---|---|
| Quantix-Saint Clair | Saint Clair | $0 | 2024-10-10 |
| Dte-St Clair Plant | East China | $0 | 2025-05-06 |
| Algonac Ms4-St Clair | Algonac | $0 | 2025-05-08 |
| Mod Interiors, Incorporated | Ira | $0 | 2025-02-28 |
| St Clair Ms4-St Clair | Saint Clair | $0 | 2020-09-16 |
| Kimball Twp Ms4-St Clair | Kimball | $0 | 2022-06-15 |
| Marysville Ms4-St Clair | Marysville | $0 | 2024-10-02 |
| Memphis Sand And Gravel-St Clair Co | Riley Township | $0 | 2023-06-13 |
| Country Meadows School | Fair Haven | $0 | |
| Blue Water Renewables (P0262) | Smiths Creek | $0 | 2025-04-25 |