Clean Water Act discharge permit · NPDES CT0100854

RIDGEFIELD, TOWN OF (MAIN), Ridgefield, CT: NPDES CT0100854 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
49Pollutants under a numeric limit
13Pollutants with an effluent exceedance

RIDGEFIELD, TOWN OF (MAIN) holds NPDES permit CT0100854, which discharges to Great Swamp Trip To Norwalk River. EPA’s file records it issued September 30, 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	RIDGEFIELD, TOWN OF (MAIN)
Permittee as filed	RIDGEFIELD, TOWN OF (MAIN)
NPDES ID	CT0100854
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 30, 2015
Expiration date	September 30, 2020
Issuing agency	CT DEP
Address	Ridgefield, CT 06877
Receiving water	GREAT SWAMP TRIP TO NORWALK RIVER
Subwatershed	Norwalk River-Frontal Norwalk Harbor (HUC 011000060202)
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

52Pollutants on file
49Under a numeric limit
31With a violation of any kind
13With 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
Zinc, total [as Zn]	4	70	68	January 31, 2024	354% over the limit
Flow, in conduit or thru treatment plant	0	32	32	April 30, 2015	78% over the limit
Phosphorus, total [as P]	7	28	22	September 30, 2020	250% over the limit
Nitrogen, ammonia total [as N]	12	24	20	June 30, 2005	400% over the limit
BOD, 5-day, 20 deg. C	7	8	5	June 30, 2005	70% over the limit
Oxygen, dissolved [DO]	1	7	5	July 31, 2002	48% over the limit
Copper, total [as Cu]	2	5	2	June 30, 2004	25% over the limit
E. coli	2	4	2	May 31, 2026	99,999% over the limit
BOD, 5-day, percent removal	1	3	2	December 31, 2002	567% over the limit
Phosphorus, Total [Avg Seasonal Load Cap]	1	2	2	October 31, 2024	1,688% over the limit
Solids, suspended percent removal	1	2	1	January 31, 2001	567% over the limit
Coliform, fecal general	2	1	1	August 31, 2001	534% over the limit
NOAEL Static 48Hr Acute D. pulex	2	1	1	March 31, 2019	20% over the limit
Solids, total suspended	7	3	0
Polychlorinated biphenyls [PCBs]	1	3	0
Arsenic, sludge tot. dry wt [as As]	1	3	0
Beryllium, sludge, tot. dry wt [as Be]	1	3	0
Solids, total, percent	1	3	0
Solids, fixed, % of total solids	1	3	0
Solids, volatile % of total solids	1	3	0
Zinc, sludge, total, dry weight [as Zn]	1	3	0
Lead, sludge, total, dry weight [as Pb]	1	3	0
Nickel, sludge, total, dry weight [as Ni]	1	3	0
Mercury, sludge, total, dry weight [as Hg]	1	3	0
Chromium, sludge, total, dry weight [as Cr]	1	3	0
Copper, sludge, total, dry weight [as Cu]	1	3	0
Cadmium, sludge, total, dry weight [as Cd]	1	3	0
Flow rate	2	2	0
pH	2	2	0
Solids, settleable	0	2	0
Carbonaceous BOD, 5 day, 20 deg C filtrd	0	2	0
Nitrogen, nitrite total [as N]	2	0	0
Nitrogen, nitrate total [as N]	2	0	0
Cyanide, total [as CN]	2	0	0
Cyanide, free [amenable to chlorination]	2	0	0
Arsenic, total [as As]	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
Iron, total [as Fe]	2	0	0
Lead, total [as Pb]	2	0	0
Thallium, total [as Tl]	2	0	0
Nickel, total [as Ni]	2	0	0
Silver, total [as Ag]	2	0	0
Antimony, total [as Sb]	2	0	0
Aluminum, total [as Al]	2	0	0
Selenium, total [as Se]	2	0	0
Phenols	2	0	0
Chlorine, total residual	2	0	0
Mercury, total [as Hg]	2	0	0
NOAEL Static 48Hr Acute Pimephales promelas	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

1Single-event violations

Date	What EPA recorded	Agency
February 23, 2018	Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)	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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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 CT0100854 for RIDGEFIELD, TOWN OF (MAIN) in Ridgefield, CT, which is administratively continued and classed as a Major discharger. The page lists 49 pollutants under a numeric limit, of which 13 had an effluent exceedance, and the permit's receiving water is GREAT SWAMP TRIP TO NORWALK RIVER in the Norwalk River-Frontal Norwalk Harbor (HUC 011000060202) subwatershed.