Clean Water Act discharge permit · NPDES IL0030503

QUINCY WASTEWATER TREATMENT FACILITY, Quincy, IL: NPDES IL0030503 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
36Pollutants under a numeric limit
5Pollutants with an effluent exceedance

QUINCY WASTEWATER TREATMENT FACILITY, held by QUINCY, CITY OF, holds NPDES permit IL0030503, which discharges to Mississippi River. EPA’s file records it issued July 8, 2015 and expiring July 31, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	QUINCY WASTEWATER TREATMENT FACILITY
Permittee as filed	QUINCY, CITY OF
NPDES ID	IL0030503
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	July 8, 2015
Expiration date	July 31, 2020
Address	Quincy, IL 62301
Receiving water	MISSISSIPPI RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Curtis Creek-Mississippi River (HUC 071100011006)

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

Effluent limits and exceedances

37Pollutants on file
36Under a numeric limit
9With 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	8	31	28	March 31, 2019	2,291% over the limit
Nitrogen, ammonia total [as N]	9	27	26	September 30, 2025	202% over the limit
Coliform, fecal general	2	22	20	June 30, 2026	99,999% over the limit
Chlorine, total residual	3	25	10	October 31, 2018	92% over the limit
BOD, carbonaceous [5 day, 20 C]	4	8	7	October 31, 2025	148% over the limit
Flow	0	12	0
Flow, in conduit or thru treatment plant	4	2	0
Phosphorus, total [as P]	3	1	0
Nitrogen, total [as N]	1	1	0
pH	6	0	0
Overflows	6	0	0
BOD, 5-day, 20 deg. C	4	0	0
Oxygen, dissolved [DO]	2	0	0
Oil & Grease	2	0	0
Cyanide, weak acid, dissociable	2	0	0
Cyanide, total [as CN]	2	0	0
Fluoride, total [as F]	2	0	0
Arsenic, total [as As]	2	0	0
Barium, total [as Ba]	2	0	0
Beryllium, total [as Be]	2	0	0
Cadmium, total [as Cd]	2	0	0
Chromium, hexavalent [as Cr]	2	0	0
Chromium, total [as Cr]	2	0	0
Copper, total [as Cu]	2	0	0
Iron, total [as Fe]	2	0	0
Iron, dissolved [as Fe]	2	0	0
Lead, total [as Pb]	2	0	0
Manganese, total [as Mn]	2	0	0
Thallium, total [as Tl]	2	0	0
Nickel, total [as Ni]	2	0	0
Silver, total [as Ag]	2	0	0
Zinc, total [as Zn]	2	0	0
Antimony, total [as Sb]	2	0	0
Selenium, total [as Se]	2	0	0
Phenolics, total recoverable	2	0	0
Mercury, total [as Hg]	2	0	0
Flow, total	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

9Single-event violations

Date	What EPA recorded	Agency
July 1, 2026	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	ST6
June 27, 2026	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	ST6
April 15, 2026	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	ST6
March 19, 2026	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	ST6
March 12, 2026	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	ST6
November 13, 2025	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	ST6
October 19, 2025	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	ST6
May 19, 2025	Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	ST6
May 19, 2025	Wet-weather SSO, no 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 IL0030503 there.

Nearby on the register

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