Clean Water Act discharge permit · NPDES IL0026441

DUPO STP, VILLAGE OF, Dupo, IL: NPDES IL0026441 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
8Pollutants under a numeric limit
4Pollutants with an effluent exceedance

DUPO STP, VILLAGE OF, held by DUPO, VILLAGE OF, holds NPDES permit IL0026441, which discharges to Mississippi River. EPA’s file records it issued July 11, 2017 and expiring June 30, 2022. 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	DUPO STP, VILLAGE OF
Permittee as filed	DUPO, VILLAGE OF
NPDES ID	IL0026441
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	July 11, 2017
Expiration date	June 30, 2022
Address	Dupo, IL 62239
Receiving water	MISSISSIPPI RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Palmer Creek-Mississippi River (HUC 071401010507)
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

8Pollutants on file
8Under a numeric limit
7With a violation of any kind
4With 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
BOD, carbonaceous [5 day, 20 C]	4	400	28	January 31, 2023	223% over the limit
Solids, total suspended	5	473	25	May 31, 2016	124% over the limit
Coliform, fecal general	1	104	11	April 30, 2023	299,900% over the limit
Chlorine, total residual	1	100	9	April 30, 2023	33% over the limit
Flow, in conduit or thru treatment plant	4	364	0
pH	2	180	0
BOD, 5-day, 20 deg. C	1	93	0
Nitrogen, ammonia total [as N]	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 IL0026441.

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 IL0026441 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers Clean Water Act discharge permit NPDES IL0026441 for DUPO STP, VILLAGE OF in Dupo, IL, which discharges to the Mississippi River and is listed as administratively continued. The page lists 8 as the discharger class, 4 pollutants under a numeric limit, and 4 pollutants with an effluent exceedance.