Bay, MI
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.
Environmental data for Bay in Michigan · Population: 103,235
Bay, MI is tracked across three EPA datasets covering 10 Toxics Release Inventory (TRI) facilities, 25 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 49/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 4.1M lbs of reported toxic releases under EPCRA Section 313, while 5 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 37 and a peak AQI of 73 in 2024, with 76% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 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 | Population | 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 | 2 |
| 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 |
| KYCA COMMUNITY | 73 | 1 |
| 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 |
Cities in Bay (3)
Frequently Asked Questions
What is the environmental risk level in Bay, Michigan? ▼
Are there Superfund sites in Bay? ▼
How many toxic release facilities are in Bay? ▼
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What environmental agencies cover Bay? ▼
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.