EPA Air · stack tests by state and year
Air-emissions stack tests in Illinois, 2026
- 165Stack 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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Illinois, 2026
- Williamson County 19
- Rock Island County 17
- Montgomery County 15
- Kane County 13
- Macon County 12
- Champaign County 11
- Clark County 11
- Will County 10
- La Salle County 9
- Cook County 6
- Clay County 5
- Madison County 4
- Effingham County 4
- Massac County 4
- Lake County 3
- Christian County 3
Illinois, other years
Air-emissions stack tests recorded in Illinois, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-07-22 | CLARIOS LLC | GENEVA, Kane, IL | Fail | State |
| 2026-07-21 | MIDWEST MATERIAL SUPPLY LLC — high-priority violation on file | MURPHYSBORO, Jackson, IL | Pass | State |
| 2026-07-21 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-07-17 | BUTTERFIELD ROAD CCDD | NORTH AURORA, Kane, IL | Pass | State |
| 2026-07-08 | PRIMARY PRODUCTS INGREDIENTS AMERICAS LLC | DECATUR, Macon, IL | Pass | State |
| 2026-07-08 | PRIMARY PRODUCTS INGREDIENTS AMERICAS LLC | DECATUR, Macon, IL | Pass | State |
| 2026-07-07 | CITY OF FARMER CITY POWER PLANT | FARMER CITY, De Witt, IL | Pass | State |
| 2026-07-02 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-07-02 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-07-01 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-07-01 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-25 | MARSHALL MUNICIPAL UTILITIES | MARSHALL, Clark, IL | Pass | State |
| 2026-06-25 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-25 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-25 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-24 | MARSHALL MUNICIPAL UTILITIES | MARSHALL, Clark, IL | Pass | State |
| 2026-06-24 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-24 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-24 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-23 | MARSHALL MUNICIPAL UTILITIES | MARSHALL, Clark, IL | Pass | State |
| 2026-06-23 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-23 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-23 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-23 | VECTOR PIPELINE | ELWOOD, Will, IL | Pass | State |
| 2026-06-19 | DYNEGY MIDWEST GENERATION LLC | BALDWIN, Randolph, IL | Pass | State |
| 2026-06-18 | CITY OF CASEY | CASEY, Clark, IL | Pass | State |
| 2026-06-18 | CITY OF CASEY | CASEY, Clark, IL | Pass | State |
| 2026-06-17 | CITY OF CASEY | CASEY, Clark, IL | Pass | State |
| 2026-06-17 | CITY OF ALTAMONT | ALTAMONT, Effingham, IL | Pass | State |
| 2026-06-16 | CITY OF ALTAMONT | ALTAMONT, Effingham, IL | Pass | State |
| 2026-06-16 | CITY OF ALTAMONT | ALTAMONT, Effingham, IL | Pass | State |
| 2026-06-11 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-11 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-10 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-10 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-10 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-10 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-09 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-09 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-09 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-08 | KINCAID GENERATION LLC | KINCAID, Christian, IL | Pending | State |
| 2026-06-08 | KINCAID GENERATION LLC | KINCAID, Christian, IL | Pending | State |
| 2026-06-08 | KINCAID GENERATION LLC | KINCAID, Christian, IL | Pending | State |
| 2026-06-08 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-06-08 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-06-08 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pending | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pending | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pass | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pass | State |
| 2026-05-27 | E.T. SIMONDS MATERIALS CO | MT VERNON, Jefferson, IL | Pass | State |
| 2026-05-21 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-19 | ADVOCATE ILLINOIS MASONIC MEDICAL CENTER | CHICAGO, Cook, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-14 | ILLINOIS POWER GENERATING CO | NEWTON, Jasper, IL | Pass | State |
| 2026-05-14 | WAYNE CO LANDFILL INC | FAIRFIELD, Wayne, IL | Pass | State |
| 2026-05-13 | CONMAT INC | DIXON, Lee, IL | Pass | State |
| 2026-05-01 | ILLINOIS CEMENT CO | LASALLE, La Salle, IL | Pass | State |
| 2026-04-29 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Fail | State |
| 2026-04-24 | WINNETKA ELECTRIC PLANT | WINNETKA, Cook, IL | Pass | State |
| 2026-04-24 | WINNETKA ELECTRIC PLANT | WINNETKA, Cook, IL | Pass | State |
| 2026-04-23 | MIDWEST GENERATION LLC | PEKIN, Tazewell, IL | Pass | State |
| 2026-04-22 | GENERAL METAL COATINGS | ALEDO, Mercer, IL | Pass | State |
| 2026-04-21 | NEW FRONTIER MATERIALS | ALTON, Madison, IL | Pending | State |
| 2026-04-21 | NEW FRONTIER MATERIALS | ALTON, Madison, IL | Pass | State |
| 2026-04-20 | WAUKEGAN ELECTRIC GENERATING STATION | WAUKEGAN, Lake, IL | Pass | State |
| 2026-04-20 | WAUKEGAN ELECTRIC GENERATING STATION | WAUKEGAN, Lake, IL | Pass | State |
| 2026-04-20 | WAUKEGAN ELECTRIC GENERATING STATION | WAUKEGAN, Lake, IL | Pass | State |
| 2026-04-20 | WEST END DISPOSAL FACILITY | THOMPSONVILLE, Saline, IL | Pass | State |
| 2026-04-17 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-17 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-16 | CLARIOS LLC | GENEVA, Kane, IL | Fail | State |
| 2026-04-16 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-15 | ADVOCATE ILLINOIS MASONIC MEDICAL CENTER | CHICAGO, Cook, IL | Pass | State |
| 2026-04-15 | RUMPKE LANDFILL 33 | EFFINGHAM, Effingham, IL | Pass | State |
| 2026-04-15 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.