EPA Air · stack tests by county and year

Air-emissions stack tests in Monroe County, Michigan, 2025

18Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Monroe County, Michigan during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Monroe County facility page.

Monroe County, Michigan, 2025

Air-emissions stack tests in Monroe County, other years

Air-emissions stack tests recorded in Monroe County, Michigan, 2025

Date	Facility	Kind	Agency
2025-12-19	GERDAU MACSTEEL MONROE MILL — high-priority violation on file	Pass	State
2025-12-10	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-12-05	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-12-05	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-12-03	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-11-19	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-09-26	GERDAU MACSTEEL MONROE MILL — high-priority violation on file	Pass	State
2025-09-10	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-07-16	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-05-30	GUARDIAN INDUSTRIES-CARLETON	Pass	State
2025-04-24	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-04-23	GERDAU MACSTEEL MONROE MILL — high-priority violation on file	Pass	State
2025-04-09	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-03-05	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-02-28	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-02-20	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-01-31	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State
2025-01-29	DTE ELECTRIC COMPANY - MONROE POWER PLANT	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.

What this page shows

This page covers Clean Air Act facilities in the EPA air register with stack tests in Monroe county, MI, in 2025. It lists 18 stack tests recorded in 2025.