EPA Air · violations by state and year

High-priority air violations in Iowa, 2026

64Violations

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. Every violation below was recorded against a source in Iowa during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Iowa, 2026

Iowa, other years

High-priority air violations recorded in Iowa, 2026

Date	Facility	Where	Kind	Agency
2026-08-20	HYCAST FOUNDRY — high-priority violation on file	FAIRFIELD, Jefferson, IA	HPV day-zero determination	State
2026-08-19	CITY OF ONAWA-WASTEWATER TREATMENT PLANT — high-priority violation on file	ONAWA, Monona, IA	Earliest FRV determination	State
2026-08-17	CARGILL INC-SIOUX CITY — high-priority violation on file	SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-08-14	CARGILL INC-FORT DODGE — high-priority violation on file	FORT DODGE, Webster, IA	Earliest FRV determination	State
2026-08-11	POET BIOREFINING CORNING — high-priority violation on file	CORNING, Adams, IA	Earliest FRV determination	State
2026-08-10	THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file	DENISON, Crawford, IA	Earliest FRV determination	State
2026-07-30	POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file	IOWA FALLS, Hardin, IA	Earliest FRV determination	State
2026-07-29	MID AMERICAN ENERGY CO-SALIX — high-priority violation on file	SALIX, Woodbury, IA	Earliest FRV determination	State
2026-07-27	LOESS HILLS REGIONAL SANITARY LANDFILL — high-priority violation on file	MALVERN, Mills, IA	Earliest FRV determination	State
2026-07-27	HNI CORP-CENTRAL CAMPUS-OAK STREET STEEL — high-priority violation on file	MUSCATINE, Muscatine, IA	Earliest FRV determination	State
2026-07-27	HNI CORP-NORTH CAMPUS-ALLSTEEL COMPONENT — high-priority violation on file	MUSCATINE, Muscatine, IA	Earliest FRV determination	State
2026-07-27	CNH AMERICA LLC — high-priority violation on file	BURLINGTON, Des Moines, IA	Earliest FRV determination	State
2026-07-27	WB SCOTT AREA LLC — high-priority violation on file	DAVENPORT, Scott, IA	Earliest FRV determination	State
2026-07-27	VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file	HARTLEY, O'Brien, IA	Earliest FRV determination	State
2026-07-27	PRINCIPAL LIFE INSURANCE COMPANY — high-priority violation on file	DES MOINES, Polk, IA	Earliest FRV determination	State
2026-07-27	PELLA WEST SUBSTATION — high-priority violation on file	PELLA, Marion, IA	Earliest FRV determination	State
2026-07-27	WEST BRANCH RNG — high-priority violation on file	MAURICE, Sioux, IA	Earliest FRV determination	State
2026-07-26	KNIFE RIVER MIDWEST LLC-SIOUX CITY-PLT#4 — high-priority violation on file	SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-07-23	ZINPRO CORP - GARNER — high-priority violation on file	GARNER, Hancock, IA	Earliest FRV determination	State
2026-07-20	CARGILL ANIMAL NUTRITION - SIOUX CITY — high-priority violation on file	SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-07-13	CARGILL INC-SIOUX CITY — high-priority violation on file	SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-07-08	CARGILL INC-SIOUX CITY — high-priority violation on file	SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-07-07	POET BIOREFINING - LIBERTY (EMMETSBURG) — high-priority violation on file	EMMETSBURG, Palo Alto, IA	Earliest FRV determination	State
2026-07-07	HYCAST FOUNDRY — high-priority violation on file	FAIRFIELD, Jefferson, IA	HPV day-zero determination	State
2026-06-22	VERBIO — high-priority violation on file	NEVADA, Story, IA	Earliest FRV determination	State
2026-06-22	HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file	LAWLER, Chickasaw, IA	Earliest FRV determination	State
2026-06-20	MASTERBRAND CABINETS - WATERLOO OPERATIONS — high-priority violation on file	WATERLOO, Black Hawk, IA	Earliest FRV determination	State
2026-06-15	SSAB IOWA INC — high-priority violation on file	MUSCATINE, Muscatine, IA	HPV day-zero determination	State
2026-06-06	HYCAST FOUNDRY — high-priority violation on file	FAIRFIELD, Jefferson, IA	HPV day-zero determination	State
2026-06-05	SEABOARD TRIUMPH FOODS, LLC — high-priority violation on file	CITY OF SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-05-28	GENERAL MILLS OPERATIONS, INC. — high-priority violation on file	CEDAR RAPIDS, Linn, IA	Earliest FRV determination	Local
2026-05-19	HYCAST FOUNDRY — high-priority violation on file	FAIRFIELD, Jefferson, IA	Earliest FRV determination	State
2026-05-13	HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file	MASON CITY, Cerro Gordo, IA	HPV day-zero determination	State
2026-05-07	PARKER WELDING & FABRICATION INC — high-priority violation on file	WINTERSET (HISTORICAL), Madison, IA	Earliest FRV determination	State
2026-05-04	JBS USA LLC — high-priority violation on file	MARSHALLTOWN, Marshall, IA	Earliest FRV determination	State
2026-05-04	CDI LLC - CHARLES CITY — high-priority violation on file	CHARLES CITY, Floyd, IA	Earliest FRV determination	State
2026-05-04	CDI LLC - FOREST CITY — high-priority violation on file	FOREST CITY, Winnebago, IA	Earliest FRV determination	State
2026-05-04	CITY OF SHENANDOAH-SHENANDOAH SANITATION — high-priority violation on file	SHENANDOAH, Page, IA	Earliest FRV determination	State
2026-04-27	MID AMERICAN ENERGY CO-SALIX — high-priority violation on file	SALIX, Woodbury, IA	Earliest FRV determination	State
2026-04-21	METRO PARK EAST LANDFILL — high-priority violation on file	MITCHELLVILLE, Polk, IA	Earliest FRV determination	State
2026-04-21	POET BIOREFINING - GOWRIE, LLC — high-priority violation on file	GOWRIE, Webster, IA	Earliest FRV determination	State
2026-04-21	INDIAN MOTORCYCLE LLC — high-priority violation on file	SPIRIT LAKE, Dickinson, IA	Earliest FRV determination	State
2026-04-13	GOLDEN GRAIN ENERGY LLC — high-priority violation on file	MASON CITY, Cerro Gordo, IA	Earliest FRV determination	State
2026-04-01	JBS USA LLC — high-priority violation on file	MARSHALLTOWN, Marshall, IA	Earliest FRV determination	State
2026-03-31	STINE ATP — high-priority violation on file	REDFIELD, Dallas, IA	Earliest FRV determination	State
2026-03-27	3M MINNESOTA MINING & MANUFACTURING CO — high-priority violation on file	KNOXVILLE, Marion, IA	Earliest FRV determination	State
2026-03-16	VERBIO — high-priority violation on file	NEVADA, Story, IA	Earliest FRV determination	State
2026-03-11	LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file	MARCUS, Cherokee, IA	Earliest FRV determination	State
2026-03-04	SEABOARD TRIUMPH FOODS, LLC — high-priority violation on file	CITY OF SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-03-02	POET BIOREFINING - ARTHUR, LLC — high-priority violation on file	ARTHUR, Ida, IA	Earliest FRV determination	State
2026-02-25	CLIMAX MOLYBDENUM CO — high-priority violation on file	FORT MADISON, Lee, IA	Earliest FRV determination	State
2026-02-23	ROQUETTE AMERICA INC — high-priority violation on file	KEOKUK, Lee, IA	HPV day-zero determination	State
2026-02-20	STRAWBERRY POINT UTILITIES — high-priority violation on file	STRAWBERRY POINT, Clayton, IA	Earliest FRV determination	State
2026-02-18	HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file	MASON CITY, Cerro Gordo, IA	HPV day-zero determination	U.S. EPA
2026-02-13	OSMIUM DATA CENTER — high-priority violation on file	WEST DES MOINES, Warren, IA	Earliest FRV determination	State
2026-02-11	GROWMARK INC - FORT DODGE TERMINAL — high-priority violation on file	DUNCOMBE, Webster, IA	Earliest FRV determination	State
2026-02-03	HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file	MASON CITY, Cerro Gordo, IA	HPV day-zero determination	State
2026-02-02	GRAETTINGER MUNICIPAL LIGHT PLANT — high-priority violation on file	GRAETTINGER, Palo Alto, IA	Earliest FRV determination	State
2026-01-27	GRAIN PROCESSING CORP — high-priority violation on file	MUSCATINE, Muscatine, IA	Earliest FRV determination	State
2026-01-27	DANISCO US, INC. — high-priority violation on file	CEDAR RAPIDS, Linn, IA	Earliest FRV determination	Local
2026-01-12	ROQUETTE AMERICA INC — high-priority violation on file	KEOKUK, Lee, IA	Earliest FRV determination	State
2026-01-06	CARGILL INC-SIOUX CITY — high-priority violation on file	SIOUX CITY, Woodbury, IA	Earliest FRV determination	State
2026-01-02	HYCAST FOUNDRY — high-priority violation on file	FAIRFIELD, Jefferson, IA	HPV day-zero determination	State
2026-01-01	GRAIN PROCESSING CORP — high-priority violation on file	MUSCATINE, Muscatine, IA	HPV day-zero determination	State

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