Clean Water Act discharge permit · NPDES IL0001830
CATERPILLAR INC - MAPLETON PLANT, Mapleton, IL: NPDES IL0001830 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 16Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CATERPILLAR INC - MAPLETON PLANT, held by CATERPILLAR INC, holds NPDES permit IL0001830, which discharges to Illinois River. EPA’s file records it issued August 1, 2012 and expiring July 31, 2017. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CATERPILLAR INC - MAPLETON PLANT |
|---|---|
| Permittee as filed | CATERPILLAR INC |
| NPDES ID | IL0001830 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | August 1, 2012 |
| Expiration date | July 31, 2017 |
| Address | Mapleton, IL 61547 |
| Receiving water | ILLINOIS RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Pekin Lake-Illinois River (HUC 071300030304) |
| SIC | 3321 – Gray And Ductile Iron Foundries |
| Other EPA IDs (FRS) | RCRA handler ILD052664364; ICIS-AIR source IL000143805AAB |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 17Pollutants on file
- 16Under a numeric limit
- 11With a violation of any kind
- 7With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Phenol | 8 | 17 | 17 | October 31, 2024 | 2,733% over the limit |
| Solids, total suspended | 8 | 13 | 13 | October 31, 2025 | 346% over the limit |
| Oil and grease | 8 | 5 | 5 | April 30, 2021 | 49% over the limit |
| Coliform, fecal general | 1 | 6 | 3 | February 28, 2023 | 505% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 3 | 3 | October 31, 2006 | 105% over the limit |
| Chlorine, total residual | 1 | 46 | 1 | July 31, 2010 | 20% over the limit |
| Copper, total [as Cu] | 4 | 1 | 1 | June 30, 2024 | 35% over the limit |
| Flow, in conduit or thru treatment plant | 18 | 4 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 4 | 0 | ||
| Mercury, total [as Hg] | 0 | 2 | 0 | ||
| Temperature, water deg. fahrenheit | 1 | 1 | 0 | ||
| Zinc, total [as Zn] | 8 | 0 | 0 | ||
| pH | 4 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 4 | 0 | 0 | ||
| Chromium, total [as Cr] | 4 | 0 | 0 | ||
| Iron, total [as Fe] | 4 | 0 | 0 | ||
| Lead, total [as Pb] | 4 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES IL0001830.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID IL0001830 there.
Nearby on the register
- Discharge permits in Mapleton
- Every permit record in Mapleton, A to Z
- Discharge permits in Illinois
- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.