Clean Water Act discharge permit · NPDES IL0024201
MOKENA, VILLAGE OF, Mokena, IL: NPDES IL0024201 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 13Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
MOKENA, VILLAGE OF holds NPDES permit IL0024201, which discharges to Marley Creek Trib To Hickory Creek. EPA’s file records it issued November 17, 2011 and expiring November 30, 2016. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MOKENA, VILLAGE OF |
|---|---|
| Permittee as filed | MOKENA, VILLAGE OF |
| NPDES ID | IL0024201 |
| 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 17, 2011 |
| Expiration date | November 30, 2016 |
| Address | Mokena, IL 60448 |
| Receiving water | MARLEY CREEK TRIB TO HICKORY CREEK |
| Subwatershed | Hickory Creek (HUC 071200040603) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 33Pollutants on file
- 13Under a numeric limit
- 33With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 6 | 13 | 6 | February 28, 2018 | 35% over the limit |
| Oxygen, dissolved [DO] | 5 | 13 | 1 | January 31, 2012 | 273% over the limit |
| Nitrogen, ammonia total [as N] | 54 | 7 | 1 | January 31, 2026 | 71% over the limit |
| pH | 4 | 7 | 1 | March 31, 2007 | |
| Coliform, fecal general | 2 | 3 | 1 | July 31, 2024 | 35% over the limit |
| Chlorine, total residual | 3 | 12 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 4 | 0 | ||
| Nitrogen, total [as N] | 1 | 4 | 0 | ||
| Phosphorus, total [as P] | 1 | 4 | 0 | ||
| Copper, total [as Cu] | 0 | 4 | 0 | ||
| Silver, total [as Ag] | 0 | 4 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 3 | 0 | ||
| Zinc, total [as Zn] | 1 | 2 | 0 | ||
| Oil & Grease | 0 | 2 | 0 | ||
| Cyanide, total [as CN] | 0 | 2 | 0 | ||
| Fluoride, total [as F] | 0 | 2 | 0 | ||
| Arsenic, total [as As] | 0 | 2 | 0 | ||
| Barium, total [as Ba] | 0 | 2 | 0 | ||
| Cadmium, total [as Cd] | 0 | 2 | 0 | ||
| Chromium, hexavalent [as Cr] | 0 | 2 | 0 | ||
| Chromium, total [as Cr] | 0 | 2 | 0 | ||
| Iron, total [as Fe] | 0 | 2 | 0 | ||
| Iron, dissolved [as Fe] | 0 | 2 | 0 | ||
| Lead, total [as Pb] | 0 | 2 | 0 | ||
| Manganese, total [as Mn] | 0 | 2 | 0 | ||
| Nickel, total [as Ni] | 0 | 2 | 0 | ||
| Selenium, total [as Se] | 0 | 2 | 0 | ||
| Phenolics, total recoverable | 0 | 2 | 0 | ||
| Mercury, total [as Hg] | 0 | 2 | 0 | ||
| Flow, total | 1 | 1 | 0 | ||
| Cyanide, weak acid, dissociable | 0 | 1 | 0 | ||
| Cyanide, free [amenable to chlorination] | 0 | 1 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 18, 2025 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
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.
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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 IL0024201 there.
Nearby on the register
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.