Clean Water Act discharge permit · NPDES IL0028177

COLCHESTER-STP, CITY OF, Colchester, IL: NPDES IL0028177 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
10Pollutants under a numeric limit
5Pollutants with an effluent exceedance

COLCHESTER-STP, CITY OF, held by COLCHESTER, CITY OF, holds NPDES permit IL0028177, which discharges to Unnamed Trib Of East Fork Of The Lamoine River. EPA’s file records it issued September 15, 2020 and expiring September 30, 2025. 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	COLCHESTER-STP, CITY OF
Permittee as filed	COLCHESTER, CITY OF
NPDES ID	IL0028177
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	September 15, 2020
Expiration date	September 30, 2025
Address	Colchester, IL 62326
Receiving water	UNNAMED TRIB OF EAST FORK OF THE LAMOINE RIVER
Subwatershed	Argyle Lake-East Fork La Moine River (HUC 071300100306)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

10Pollutants on file
10Under a numeric limit
6With 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	248	241	April 30, 2026	891% over the limit
Oxygen, dissolved [DO]	5	80	55	July 31, 2025	73% over the limit
BOD, carbonaceous [5 day, 20 C]	4	62	54	June 30, 2026	185% over the limit
Nitrogen, ammonia total [as N]	1	6	1	March 31, 2026	5% over the limit
Chlorine, total residual	1	3	1	July 31, 2007	16,100% over the limit
Flow, in conduit or thru treatment plant	4	5	0
BOD, 5-day, 20 deg. C	2	0	0
pH	2	0	0
Coliform, fecal general	2	0	0
Flow	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 IL0028177.

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 IL0028177 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers Clean Water Act discharge permit NPDES IL0028177, held by COLCHESTER, CITY OF for the facility COLCHESTER-STP, CITY OF in Colchester, IL, which discharges to UNNAMED TRIB OF EAST FORK OF THE LAMOINE RIVER within the Argyle Lake-East Fork La Moine River subwatershed (HUC 071300100306). The permit is listed as administratively continued with a Minor discharger class, and the page reports 10 pollutants under a numeric limit and 5 pollutants with an effluent exceedance.