St. Clair, MI
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. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.
Environmental data for St. Clair in Michigan · Population: 160,089
TRI sites such as Dte Electric Co-Belle River Power Plant; Intertape Polymer Group; Mueller Brass Co; SDWIS systems such as PORT HURON, CITY OF; PORT HURON TOWNSHIP; MARYSVILLE, CITY OF anchor St. Clair, MI's EPA extract. Derived burden score 56/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
EPCRA disclosures in St. Clair total 17.8M lbs; health-flagged SDWIS rows include ST. CLAIR, CITY OF; MARINE CITY; YALE, CITY OF, while Dte Electric Co-Belle River Power Plant leads TRI pounds. AQS median AQI 41 / peak 134 in 2024.
Largest TRI sites in the extract: Dte Electric Co-Belle River Power Plant; Intertape Polymer Group; Mueller Brass Co. Named SDWIS systems: PORT HURON, CITY OF; PORT HURON TOWNSHIP; MARYSVILLE, CITY OF. Burden score 56/100 (Moderate Risk) is the only weighted composite here; tables reproduce EPA disclosure history, not a current-safety verdict.
Release-over-release change
What changed for St. Clair, MI: EPA TRI 2023 reporting year
Same facilities, both years
-21.0%
17 facilities that filed in 2022 and 2023
Whole inventory
-21.0%
2.9 million lb → 2.3 million lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- St. Clair, MI's total reported releases fell from 2.9 million lb in 2022 to 2.3 million lb in 2023, based on EPA TRI filings.
- St. Clair, MI's water releases fell from 2.0 thousand lb in 2022 to 855 lb in 2023, based on EPA TRI filings.
- St. Clair, MI's land releases fell from 2.0 million lb in 2022 to 1.4 million lb in 2023, based on EPA TRI filings.
- St. Clair, MI's chemicals reported fell from 41 in 2022 to 37 in 2023, based on EPA TRI filings.
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 | 261 (73%) | 96 | 3 | 134 |
| 2023 | 186 (51%) | 163 | 9 | 197 |
| 2022 | 232 (65%) | 125 | 2 | 133 |
| 2021 | 198 (54%) | 160 | 7 | 140 |
| 2020 | 247 (75%) | 80 | 1 | 105 |
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 Michigan, see the EPA's AirNow.gov.
Water Systems (23)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| PORT HURON, CITY OF | 28,983 | 0 |
| PORT HURON TOWNSHIP | 10,654 | 0 |
| MARYSVILLE, CITY OF | 9,959 | 0 |
| CLAY TOWNSHIP | 9,866 | 0 |
| IRA TOWNSHIP | 6,510 | 0 |
| ST. CLAIR WATER AND SEWER AUTHORITY | 5,847 | 0 |
| ST. CLAIR, CITY OF | 5,464 | 4 |
| FORT GRATIOT TOWNSHIP | 5,250 | 0 |
| KIMBALL TOWNSHIP | 5,170 | 0 |
| MARINE CITY | 4,652 | 1 |
| ALGONAC, CITY OF | 4,110 | 0 |
| ST. CLAIR TOWNSHIP | 3,270 | 0 |
| COTTRELLVILLE TOWNSHIP | 3,200 | 0 |
| BURTCHVILLE TOWNSHIP | 2,900 | 0 |
| CLYDE TOWNSHIP | 2,400 | 0 |
| YALE, CITY OF | 1,900 | 1 |
| CAPAC, VILLAGE OF | 1,775 | 0 |
| MEMPHIS, CITY OF | 1,084 | 0 |
| PINE RIVER RIDGE | 425 | 0 |
| SUMMER WOOD ESTATES | 170 | 1 |
| SUNRISE MHP | 120 | 0 |
| RIVERVIEW ESTATES | 90 | 1 |
| DUNRENTIN HEIGHTS SUBDIVISION | 81 | 0 |
TRI Facilities (21)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Dte Electric Co-Belle River Power Plant | 13.3M lbs |
| 2 | Intertape Polymer Group | 4.1M lbs |
| 3 | Mueller Brass Co | 98.9K lbs |
| 4 | Marysville Ethanol LLC | 72.2K lbs |
| 5 | Kksp Precision Machining | 64.2K lbs |
| 6 | Mueller Impacts Co | 39.5K lbs |
| 7 | Sunsation Products Inc | 38.7K lbs |
| 8 | Zf Axle Drives Marysville | 34.9K lbs |
| 9 | Michigan Metal Coatings | 31.6K lbs |
| 10 | Magna Electric Vehicle Structures | 12.7K lbs |
| 11 | Michigan Metal Coatings Plant 2 | 6.3K lbs |
| 12 | Smr-Automotive Systems USA Inc. | 4.7K lbs |
| 13 | Auria Solutions | 3.2K lbs |
| 14 | E B Eddy Paper Inc | 569 lbs |
| 15 | Wirtz Manufacturing Co Inc Plant 1 | 339 lbs |
| 16 | Iac Port Huron LLC | 16 lbs |
| 17 | Dte Electric Co - Greenwood Energy Center | 2 lbs |
| 18 | Mid-Town Petroleum Acquistion LLC | 0 lbs |
| 19 | Auto Anodics Inc | 0 lbs |
| 20 | Wirtz Manufacturing Co. Inc. Plant 4 | 0 lbs |
| 21 | Huron Automatic Screw Co | 0 lbs |
Cities in St. Clair (20)
Frequently Asked Questions
What is the environmental risk level in St. Clair, Michigan? ▼
Are there Superfund sites in St. Clair? ▼
How many toxic release facilities are in St. Clair? ▼
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Is the drinking water safe in St. Clair? ▼
What environmental agencies cover St. Clair? ▼
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.