EPA Air · stack tests by state and year
Air-emissions stack tests in Illinois, 2025
- 264Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Illinois during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Illinois, 2025
- McHenry County 20
- Cook County 18
- Kane County 17
- Williamson County 16
- Montgomery County 15
- DuPage County 13
- Will County 13
- Lake County 12
- Randolph County 10
- Ogle County 10
- Clinton County 9
- Bureau County 8
- Kankakee County 8
- Madison County 7
- Christian County 6
- Grundy County 6
- Vermilion County 6
- La Salle County 6
- Massac County 5
- Moultrie County 5
- White County 5
- Jasper County 5
- Carroll County 4
- Champaign County 4
- McDonough County 4
- St. Clair County 4
- Livingston County 4
- Monroe County 3
Illinois, other years
Air-emissions stack tests recorded in Illinois, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-07-24 | NAVAL STATION GREAT LAKES | GREAT LAKES, Lake, IL | Pass | State |
| 2025-07-23 | NATURAL GAS PIPELINE CO | ALTAMONT, Effingham, IL | Pass | State |
| 2025-07-17 | ROCHELLE MUNICIPAL UTILITIES | ROCHELLE, Ogle, IL | Pass | State |
| 2025-07-17 | ROCHELLE MUNICIPAL UTILITIES | ROCHELLE, Ogle, IL | Pass | State |
| 2025-07-17 | ROCHELLE MUNICIPAL UTILITIES | ROCHELLE, Ogle, IL | Pass | State |
| 2025-07-16 | ROCHELLE MUNICIPAL UTILITIES | ROCHELLE, Ogle, IL | Pass | State |
| 2025-07-16 | ROCHELLE MUNICIPAL UTILITIES | ROCHELLE, Ogle, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pending | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-16 | WILLIAMSON ENERGY LLC | JOHNSTON CITY, Williamson, IL | Pass | State |
| 2025-07-15 | NOURYON SURFACE CHEMISTRY LLC | MORRIS, Grundy, IL | Pass | State |
| 2025-07-14 | BUSHNELL MUNICIPAL POWER PLANT | BUSHNELL, McDonough, IL | Pass | State |
| 2025-07-14 | BUSHNELL MUNICIPAL POWER PLANT | BUSHNELL, McDonough, IL | Pass | State |
| 2025-07-13 | BUSHNELL MUNICIPAL POWER PLANT | BUSHNELL, McDonough, IL | Pass | State |
| 2025-07-13 | BUSHNELL MUNICIPAL POWER PLANT | BUSHNELL, McDonough, IL | Pass | State |
| 2025-07-10 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-10 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-09 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-09 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-08 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-08 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-07 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-07 | PRINCETON MUNICIPAL ELECTRIC UTILITY | PRINCETON, Bureau, IL | Pass | State |
| 2025-07-01 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-07-01 | SULLIVAN POWER PLANT | SULLIVAN, Moultrie, IL | Pass | State |
| 2025-07-01 | SULLIVAN POWER PLANT | SULLIVAN, Moultrie, IL | Pass | State |
| 2025-07-01 | SULLIVAN POWER PLANT | SULLIVAN, Moultrie, IL | Pass | State |
| 2025-07-01 | SULLIVAN POWER PLANT | SULLIVAN, Moultrie, IL | Pass | State |
| 2025-06-30 | SULLIVAN POWER PLANT | SULLIVAN, Moultrie, IL | Pass | State |
| 2025-06-26 | CARMI LIGHT & WATER | CARMI, White, IL | Pass | State |
| 2025-06-26 | CARMI LIGHT & WATER | CARMI, White, IL | Pass | State |
| 2025-06-26 | CARMI LIGHT & WATER | CARMI, White, IL | Pass | State |
| 2025-06-25 | CARMI LIGHT & WATER | CARMI, White, IL | Pass | State |
| 2025-06-25 | CARMI LIGHT & WATER | CARMI, White, IL | Pass | State |
| 2025-06-24 | CARLYLE MUNICIPAL ELECTRIC PLANT | CARLYLE, Clinton, IL | Pass | State |
| 2025-06-24 | CARLYLE MUNICIPAL ELECTRIC PLANT | CARLYLE, Clinton, IL | Pass | State |
| 2025-06-23 | CARLYLE MUNICIPAL ELECTRIC PLANT | CARLYLE, Clinton, IL | Pass | State |
| 2025-06-23 | CARLYLE MUNICIPAL ELECTRIC PLANT | CARLYLE, Clinton, IL | Pass | State |
| 2025-06-23 | CARLYLE MUNICIPAL ELECTRIC PLANT | CARLYLE, Clinton, IL | Pass | State |
| 2025-06-20 | CHRIST HOSPITAL & MEDICAL CENTER | OAK LAWN, Cook, IL | Fail | State |
| 2025-06-20 | CHRIST HOSPITAL & MEDICAL CENTER | OAK LAWN, Cook, IL | Fail | State |
| 2025-06-20 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-20 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-18 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-17 | CITY OF BREESE POWER PLANT | BREESE, Clinton, IL | Pass | State |
| 2025-06-17 | CITY OF BREESE POWER PLANT | BREESE, Clinton, IL | Pass | State |
| 2025-06-17 | CITY OF BREESE POWER PLANT | BREESE, Clinton, IL | Pass | State |
| 2025-06-17 | CITY OF BREESE POWER PLANT | BREESE, Clinton, IL | Pass | State |
| 2025-06-16 | WATERLOO CITY LIGHT PLANT | WATERLOO, Monroe, IL | Pass | State |
| 2025-06-16 | WATERLOO CITY LIGHT PLANT | WATERLOO, Monroe, IL | Pass | State |
| 2025-06-16 | WATERLOO CITY LIGHT PLANT | WATERLOO, Monroe, IL | Pass | State |
| 2025-06-13 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-13 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-12 | HIGHLAND ELECTRIC LIGHT PLANT | HIGHLAND, Madison, IL | Pass | State |
| 2025-06-12 | HIGHLAND ELECTRIC LIGHT PLANT | HIGHLAND, Madison, IL | Pass | State |
| 2025-06-12 | HIGHLAND ELECTRIC LIGHT PLANT | HIGHLAND, Madison, IL | Pass | State |
| 2025-06-11 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-11 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-11 | HIGHLAND ELECTRIC LIGHT PLANT | HIGHLAND, Madison, IL | Pass | State |
| 2025-06-11 | HIGHLAND ELECTRIC LIGHT PLANT | HIGHLAND, Madison, IL | Pass | State |
| 2025-06-11 | HIGHLAND ELECTRIC LIGHT PLANT | HIGHLAND, Madison, IL | Pass | State |
| 2025-06-10 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-10 | CITY OF RED BUD | RED BUD, Randolph, IL | Pass | State |
| 2025-06-10 | CITY OF RED BUD | RED BUD, Randolph, IL | Pass | State |
| 2025-06-10 | CITY OF RED BUD | RED BUD, Randolph, IL | Pass | State |
| 2025-06-09 | CITY OF RED BUD | RED BUD, Randolph, IL | Pass | State |
| 2025-06-09 | CITY OF RED BUD | RED BUD, Randolph, IL | Pass | State |
| 2025-06-05 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-05 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-05 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-04 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2025-06-04 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-03 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-06-03 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-29 | HILLSBORO ENERGY LLC | HILLSBORO, Montgomery, IL | Pass | State |
| 2025-05-23 | HOLCIM (US) INC | GRAND CHAIN, Massac, IL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.