EPA Air · violations by county and year

High-priority air violations in Monroe County, Wisconsin, 2026

25Violations

A high-priority violation is the most serious class of Clean Air Act non-compliance an agency records against a source; a federally reportable violation is the next step down in severity. Each row below is one violation recorded against a source in Monroe County, Wisconsin during 2026. 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, Wisconsin, 2026

High-priority air violations in Monroe County, other years

High-priority air violations recorded in Monroe County, Wisconsin, 2026

Date	Facility	Kind	Agency
2026-08-10	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	Earliest FRV determination	State
2026-08-08	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	Earliest FRV determination	State
2026-07-22	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	Earliest FRV determination	State
2026-07-22	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	Earliest FRV determination	State
2026-07-21	APPLETON GRP LLC — high-priority violation on file	Earliest FRV determination	State
2026-07-21	APPLETON GRP LLC — high-priority violation on file	Earliest FRV determination	State
2026-06-15	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	Earliest FRV determination	State
2026-05-01	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	HPV day-zero determination	State
2026-05-01	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	HPV day-zero determination	State
2026-05-01	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	HPV day-zero determination	State
2026-04-09	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	Earliest FRV determination	State
2026-03-10	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	HPV day-zero determination	State
2026-03-10	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	HPV day-zero determination	State
2026-03-10	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	Earliest FRV determination	State
2026-03-10	MID-AMERICA STEEL DRUM COMPANY-CLCM — high-priority violation on file	Earliest FRV determination	State
2026-03-05	PPG INDUSTRIES — high-priority violation on file	Earliest FRV determination	State
2026-03-05	PPG INDUSTRIES — high-priority violation on file	Earliest FRV determination	State
2026-03-05	PPG INDUSTRIES — high-priority violation on file	HPV day-zero determination	State
2026-03-05	PPG INDUSTRIES — high-priority violation on file	Earliest FRV determination	State
2026-03-05	PPG INDUSTRIES — high-priority violation on file	Earliest FRV determination	State
2026-03-05	PPG INDUSTRIES — high-priority violation on file	Earliest FRV determination	State
2026-03-02	GREDE LLC - LIBERTY — high-priority violation on file	Earliest FRV determination	State
2026-03-02	GREDE LLC - LIBERTY — high-priority violation on file	Earliest FRV determination	State
2026-01-15	GREDE LLC - LIBERTY — high-priority violation on file	Earliest FRV determination	State
2026-01-15	GREDE LLC - LIBERTY — high-priority violation on file	Earliest FRV determination	State

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