Bay, 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 Bay in Michigan · Population: 103,235
TRI sites such as De Karn Jc Weadock Generating Plant; Michigan Sugar Co - Bay City Factory; Mplx Terminals LLC - Bay City Mi Terminal; SDWIS systems such as BAY CITY, CITY OF; BANGOR TOWNSHIP; HAMPTON TOWNSHIP; NPL sites such as Bay City Middlegrounds anchor Bay, MI's EPA extract. Derived burden score 54/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Bay include BAY CITY, CITY OF; ESSEXVILLE, CITY OF; KAWKAWLIN TOWNSHIP, while De Karn Jc Weadock Generating Plant leads reported TRI pounds among local Form R filers. AQS median AQI 37 / peak 73 in 2024.
Burden score 54/100 (Moderate Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Bay -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Bay, MI: EPA TRI 2023 reporting year
Same facilities, both years
-70.5%
10 facilities that filed in 2022 and 2023
Whole inventory
-70.5%
1.2 million lb → 352.7 thousand lb, every facility that filed
- Bay, MI's total reported releases fell from 1.2 million lb in 2022 to 352.7 thousand lb in 2023, based on EPA TRI filings.
- Bay, MI's off-site transfers fell from 60.8 thousand lb in 2022 to 2.7 thousand lb in 2023, based on EPA TRI filings.
- Bay, MI's land releases fell from 1.0 million lb in 2022 to 291.7 thousand lb in 2023, based on EPA TRI filings.
- Bay, MI's water releases fell from 59.0 thousand lb in 2022 to 26.7 thousand lb 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 | 277 (76%) | 86 | 0 | 73 |
| 2023 | 229 (63%) | 128 | 3 | 192 |
| 2022 | 287 (81%) | 67 | 0 | 85 |
| 2021 | 290 (80%) | 73 | 0 | 86 |
| 2020 | 325 (89%) | 40 | 0 | 77 |
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 (25)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| BAY CITY, CITY OF | 32,255 | 4 |
| BANGOR TOWNSHIP | 11,999 | 0 |
| HAMPTON TOWNSHIP | 9,652 | 0 |
| BAY CO. DEPT OF WATER & SEWER | 8,465 | 0 |
| WILLIAMS TOWNSHIP | 5,444 | 0 |
| MONITOR TOWNSHIP | 5,217 | 0 |
| FRANKENLUST TOWNSHIP | 3,626 | 0 |
| ESSEXVILLE, CITY OF | 3,478 | 1 |
| KAWKAWLIN TOWNSHIP | 3,170 | 3 |
| BANGOR-MONITOR METRO DISTRICT | 2,971 | 0 |
| AUBURN | 2,087 | 0 |
| KAWKAWLIN METRO DIST WATER SUP | 1,480 | 0 |
| PINCONNING TOWNSHIP | 1,479 | 0 |
| MERRITT TOWNSHIP | 1,474 | 0 |
| FRASER TOWNSHIP | 1,226 | 0 |
| BEAVER TOWNSHIP | 1,211 | 0 |
| PINCONNING, CITY OF | 1,204 | 6 |
| LINWOOD METROPOLITAN DISTRICT | 909 | 0 |
| BEAVER ROAD AREA WATER ASSOC. | 829 | 0 |
| PORTSMOUTH TOWNSHIP | 535 | 0 |
| WISNER AREA WATER SYSTEM | 504 | 0 |
| AKRON TOWNSHIP | 219 | 0 |
| STATE ROAD COUNTRY LIVING MHC | 73 | 2 |
| SAGINAW-MIDLAND WATER SUPPLY | 1 | 0 |
| BAY AREA WATER SYSTEM | 0 | 0 |
TRI Facilities (10)
| # | Facility | Total Releases |
|---|---|---|
| 1 | De Karn Jc Weadock Generating Plant | 3.5M lbs |
| 2 | Michigan Sugar Co - Bay City Factory | 538.9K lbs |
| 3 | Mplx Terminals LLC - Bay City Mi Terminal | 16.7K lbs |
| 4 | Bay Cast - Webster Street Plant | 14.2K lbs |
| 5 | Quantum Composites Inc. | 8.4K lbs |
| 6 | Dow Silicones Corp Auburn Site | 5.1K lbs |
| 7 | Bay Cast - Center Street Plant | 5.0K lbs |
| 8 | General Motors LLC - Bay City Plant | 663 lbs |
| 9 | Straits Wood Treating | 0 lbs |
| 10 | Mersen USA Gs Corp - Bay City | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Bay City Middlegrounds | Proposed NPL Site | 50.00 |
Cities in Bay (6)
Frequently Asked Questions
What is the environmental risk level in Bay, Michigan? ▼
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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.