Clean Water Act discharge permit · NPDES IL0020729
MARENGO STP, CITY OF, Marengo, IL: NPDES IL0020729 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 31Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
MARENGO STP, CITY OF, held by MARENGO, CITY OF, holds NPDES permit IL0020729, which discharges to Kishwaukee River. EPA’s file records it issued September 17, 2015 and expiring September 30, 2020. 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 | MARENGO STP, CITY OF |
|---|---|
| Permittee as filed | MARENGO, CITY OF |
| NPDES ID | IL0020729 |
| 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 | September 17, 2015 |
| Expiration date | September 30, 2020 |
| Address | Marengo, IL 60152 |
| Receiving water | KISHWAUKEE RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Middle Coon Creek (HUC 070900060103) |
| 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
- 32Pollutants on file
- 31Under a numeric limit
- 25With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 14 | 18 | 17 | January 31, 2026 | 426% over the limit |
| Solids, total suspended | 5 | 5 | 5 | September 30, 2025 | 192% over the limit |
| Nitrogen, total [as N] | 2 | 4 | 4 | February 28, 2022 | 53% over the limit |
| Phosphorus, total [as P] | 2 | 2 | 2 | January 31, 2016 | 34% over the limit |
| Chlorine, total residual | 1 | 1 | 1 | July 31, 2025 | 5% over the limit |
| Oil & Grease | 4 | 3 | 0 | ||
| Cyanide, total [as CN] | 4 | 2 | 0 | ||
| Fluoride, total [as F] | 4 | 2 | 0 | ||
| Arsenic, total [as As] | 4 | 2 | 0 | ||
| Barium, total [as Ba] | 4 | 2 | 0 | ||
| Cadmium, total [as Cd] | 4 | 2 | 0 | ||
| Chromium, hexavalent [as Cr] | 4 | 2 | 0 | ||
| Chromium, total [as Cr] | 4 | 2 | 0 | ||
| Copper, total [as Cu] | 4 | 2 | 0 | ||
| Iron, total [as Fe] | 4 | 2 | 0 | ||
| Iron, dissolved [as Fe] | 4 | 2 | 0 | ||
| Lead, total [as Pb] | 4 | 2 | 0 | ||
| Manganese, total [as Mn] | 4 | 2 | 0 | ||
| Nickel, total [as Ni] | 4 | 2 | 0 | ||
| Silver, total [as Ag] | 4 | 2 | 0 | ||
| Zinc, total [as Zn] | 4 | 2 | 0 | ||
| Selenium, total [as Se] | 4 | 2 | 0 | ||
| Phenolics, total recoverable | 4 | 2 | 0 | ||
| Mercury, total [as Hg] | 4 | 2 | 0 | ||
| Cyanide, free [amenable to chlorination] | 0 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 5 | 0 | 0 | ||
| Cyanide, weak acid, dissociable | 4 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 0 | 0 | ||
| Coliform, fecal general | 1 | 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 IL0020729.
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 IL0020729 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.