Clean Water Act discharge permit · NPDES IL0023221
MENDOTA STP, CITY OF, Mendota, IL: NPDES IL0023221 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 33Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
MENDOTA STP, CITY OF, held by MENDOTA, CITY OF, holds NPDES permit IL0023221, which discharges to Mendota Creek. EPA’s file records it issued November 26, 2014 and expiring November 30, 2019. 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 | MENDOTA STP, CITY OF |
|---|---|
| Permittee as filed | MENDOTA, CITY OF |
| NPDES ID | IL0023221 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 26, 2014 |
| Expiration date | November 30, 2019 |
| Address | Mendota, IL 61342 |
| Receiving water | MENDOTA CREEK |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Mendota Creek-Little Vermilion River (HUC 071300010301) |
| Program components on file | Biosolids, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 35Pollutants on file
- 33Under a numeric limit
- 32With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 5 | 52 | 51 | May 31, 2026 | 99,999% over the limit |
| Chlorine, total residual | 4 | 12 | 9 | July 31, 2021 | 1,100% over the limit |
| Peracetic Acid | 0 | 8 | 8 | June 30, 2021 | 969% over the limit |
| Solids, total suspended | 11 | 7 | 6 | April 30, 2022 | 204% over the limit |
| Nitrogen, ammonia total [as N] | 20 | 7 | 5 | November 30, 2022 | 437% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 10 | 2 | June 30, 2016 | 27% over the limit |
| pH | 6 | 3 | 1 | January 31, 2019 | |
| BOD, 5-day, 20 deg. C | 7 | 9 | 0 | ||
| Phosphorus, total [as P] | 3 | 2 | 0 | ||
| Nitrogen, total [as N] | 1 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 1 | 0 | ||
| Flow, total | 2 | 1 | 0 | ||
| Oil & Grease | 1 | 1 | 0 | ||
| Cyanide, total [as CN] | 1 | 1 | 0 | ||
| Fluoride, total [as F] | 1 | 1 | 0 | ||
| Arsenic, total [as As] | 1 | 1 | 0 | ||
| Barium, total [as Ba] | 1 | 1 | 0 | ||
| Cadmium, total [as Cd] | 1 | 1 | 0 | ||
| Chromium, hexavalent [as Cr] | 1 | 1 | 0 | ||
| Chromium, total [as Cr] | 1 | 1 | 0 | ||
| Copper, total [as Cu] | 1 | 1 | 0 | ||
| Iron, total [as Fe] | 1 | 1 | 0 | ||
| Iron, dissolved [as Fe] | 1 | 1 | 0 | ||
| Lead, total [as Pb] | 1 | 1 | 0 | ||
| Manganese, total [as Mn] | 1 | 1 | 0 | ||
| Nickel, total [as Ni] | 1 | 1 | 0 | ||
| Silver, total [as Ag] | 1 | 1 | 0 | ||
| Zinc, total [as Zn] | 1 | 1 | 0 | ||
| Selenium, total [as Se] | 1 | 1 | 0 | ||
| Phenolics, total recoverable | 1 | 1 | 0 | ||
| Mercury, total [as Hg] | 1 | 1 | 0 | ||
| Cyanide, free [amenable to chlorination] | 0 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 7 | 0 | 0 | ||
| Cyanide, weak acid, dissociable | 2 | 0 | 0 | ||
| Flow | 2 | 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 IL0023221.
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 IL0023221 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.