Monroe, 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 Monroe in Michigan · Population: 155,001
TRI sites such as Dte Electric Co - Monroe Power Plant; Gerdau Macsteel Monroe; Guardian Industries - Carleton; SDWIS systems such as MONROE; MONROE SOUTH COUNTY; FRENCHTOWN TOWNSHIP; NPL sites such as Novaco Industries anchor Monroe, MI's EPA extract. Derived burden score 50/100 (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 Monroe total 20.5M lbs; health-flagged SDWIS rows include MONROE; MONROE SOUTH COUNTY; HIDDEN SHORES WEST, while Dte Electric Co - Monroe Power Plant leads TRI pounds. AQS median AQI 18 / peak 77 in 2024.
Largest TRI sites in the extract: Dte Electric Co - Monroe Power Plant; Gerdau Macsteel Monroe; Guardian Industries - Carleton. Named SDWIS systems: MONROE; MONROE SOUTH COUNTY; FRENCHTOWN TOWNSHIP. NPL sites on record: Novaco Industries. Burden score 50/100 (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 Monroe, MI: EPA TRI 2023 reporting year
Same facilities, both years
-33.3%
16 facilities that filed in 2022 and 2023
Whole inventory
-33.3%
5.7 million lb → 3.8 million lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Monroe, MI's total reported releases fell from 5.7 million lb in 2022 to 3.8 million lb in 2023, based on EPA TRI filings.
- Monroe, MI's off-site transfers rose from 139.2 thousand lb in 2022 to 3.0 million lb in 2023, based on EPA TRI filings.
- Monroe, MI's land releases fell from 4.8 million lb in 2022 to 148.5 thousand lb in 2023, based on EPA TRI filings.
- Monroe, MI's water releases fell from 32.7 thousand lb in 2022 to 22.9 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 | 56 (95%) | 3 | 0 | 77 |
| 2023 | 59 (91%) | 6 | 0 | 82 |
| 2022 | 51 (84%) | 8 | 1 | 607 |
| 2021 | 57 (93%) | 4 | 0 | 77 |
| 2020 | 58 (95%) | 3 | 0 | 66 |
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 (11)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MONROE | 49,467 | 2 |
| MONROE SOUTH COUNTY | 33,816 | 2 |
| FRENCHTOWN TOWNSHIP | 21,609 | 0 |
| BERLIN TOWNSHIP | 9,900 | 0 |
| MILAN | 7,363 | 0 |
| ASH TOWNSHIP | 5,959 | 0 |
| DUNDEE | 5,400 | 0 |
| SOUTH ROCKWOOD | 1,587 | 0 |
| PETERSBURG | 1,115 | 0 |
| WHITEFORD TOWNSHIP | 303 | 0 |
| HIDDEN SHORES WEST | 75 | 4 |
TRI Facilities (18)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Dte Electric Co - Monroe Power Plant | 19.7M lbs |
| 2 | Gerdau Macsteel Monroe | 501.9K lbs |
| 3 | Guardian Industries - Carleton | 105.7K lbs |
| 4 | Pioneer Metal Finishing LLC | 96.4K lbs |
| 5 | Advanced Heat Treat Corp. | 44.6K lbs |
| 6 | Ventower Industries LLC | 40.2K lbs |
| 7 | Fci Milan | 16.4K lbs |
| 8 | Dte Electric Company-Fermi Power Plant | 12.8K lbs |
| 9 | R J Marshall Co | 12.8K lbs |
| 10 | Jaytec LLC | 9.4K lbs |
| 11 | National Galvanizing LP | 4.2K lbs |
| 12 | Fca US Dundee Engine Plant | 449 lbs |
| 13 | Spartan Steel Coating | 266 lbs |
| 14 | Heidtman Steel Products Inc. | 22 lbs |
| 15 | Tailor Welded Blanks | 4 lbs |
| 16 | Cadillac Asphalt LLC | 1 lbs |
| 17 | Michigan Paving & Materials Co - Monroe | 0 lbs |
| 18 | Sunrise Windows Ltd | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Novaco Industries | Deleted NPL Site | 38.20 |
Cities in Monroe (10)
Frequently Asked Questions
What is the environmental risk level in Monroe, Michigan? ▼
Are there Superfund sites in Monroe? ▼
How many toxic release facilities are in Monroe? ▼
What is the air quality in Monroe? ▼
Is the drinking water safe in Monroe? ▼
What environmental agencies cover Monroe? ▼
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.