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Clean Water Act discharge permit · NPDES CT0000957

PFIZER INC., Groton, CT: NPDES CT0000957 discharge permit, effluent exceedances, inspections, penalties

PFIZER INC., held by PFIZER INC, holds NPDES permit CT0000957, which discharges to Thames River. EPA’s file records it issued May 22, 2014 and expiring May 31, 2019. 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 filedPFIZER INC.
Permittee as filedPFIZER INC
NPDES IDCT0000957
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedMay 22, 2014
Expiration dateMay 31, 2019
Issuing agencyCT DEP
AddressGroton, CT 06340
Receiving waterTHAMES RIVER
Other EPA IDs (FRS)RCRA handler CTD001147495; ICIS-AIR source CT0000000901100038

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH22626October 31, 1999
Temperature, water deg. fahrenheit22222December 31, 202517% over the limit
Di[2-ethylhexyl] phthalate [DEHP]82218August 31, 20217,082% over the limit
Cyanide, free [amenable to chlorination]0119January 31, 20014,657% over the limit
Flow, maximum during 24 hr period444April 30, 2009457% over the limit
Methylene chloride044November 30, 199570% over the limit
Solids, total suspended432September 30, 202160% over the limit
Chloroform022October 31, 1997900% over the limit
Flow rate491February 28, 20097% over the limit
Oil & Grease211August 31, 20088% over the limit
Temp. diff. between samp. & upstrm deg. F111December 31, 202555% over the limit
Cyanide, total [as CN]011November 30, 1995141% over the limit
%Repro Reduc Static Renewal 7D Americamysis bahia (formerly Mysidopsis bahia)280
Oxygen, dissolved [DO]110
Waste heat rejection rate200
BOD, 5-day, 20 deg. C200
Nitrogen, total [as N]200
Nitrogen, ammonia total [as N]200
Nitrogen, nitrite total [as N]200
Nitrogen, nitrate total [as N]200
Nitrogen, Kjeldahl, total [as N]200
Chromium, total [as Cr]200
Copper, total [as Cu]200
Iron, total [as Fe]200
Lead, total [as Pb]200
Nickel, total [as Ni]200
Zinc, total [as Zn]200
Chlorine, total residual200
Flow200
Biochemical oxygen demand-5200
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)200
LC50 Static 48Hr Acute Cyprinodon variegatus200
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)200
NOEC Lethal Static Renewal 7 Day Chronic Cyprinodeon variegatus200
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)200
NOEC Sub-Lethal Static Renewal 7 Day Chronic Cyprinodeon variegatus200
Enterococci100
pH, maximum100
pH, minimum100
Coliform, fecal general100
Duration of discharge100

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

DateWhat EPA recordedAgency
April 16, 2026Permit Violations - Violation Specified in CommentST6
February 7, 2024Management Practice Violations - Best Management Practice DeficienciesST6
February 7, 2024Management Practice Violations - Improper Chemical HandlingST6
February 7, 2024Monitoring Violations - Improper Analysis or Lab ErrorST6

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 CT0000957 there.

Nearby on the register

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

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES CT0000957, held by PFIZER INC. in Groton, CT, which discharges to the THAMES RIVER and is listed as administratively continued. The page lists 41 pollutants on file, 37 of which are under a numeric limit, 14 with a violation of any kind, and 12 with an effluent exceedance.