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Clean Water Act discharge permit · NPDES RI0100111

WOONSOCKET WWTF, Woonsocket, RI: NPDES RI0100111 discharge permit, effluent exceedances, inspections, penalties

WOONSOCKET WWTF, held by WOONSOCKET CITY HALL, holds NPDES permit RI0100111, which discharges to Blackstone River. EPA’s file records it issued October 24, 2017 and expiring December 31, 2022. 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 filedWOONSOCKET WWTF
Permittee as filedWOONSOCKET CITY HALL
NPDES IDRI0100111
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedOctober 24, 2017
Expiration dateDecember 31, 2022
AddressWoonsocket, RI 02895
Receiving waterBLACKSTONE RIVER
Receiving water impaired303(D) Listed
SubwatershedPeters River-Blackstone River (HUC 010900030208)

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

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
Phosphorus, total [as P]44236July 31, 2026400% over the limit
Solids, total suspended154430May 31, 2023620% over the limit
Copper, total [as Cu]22521October 31, 2025517% over the limit
pH22321October 31, 2024
Nitrogen, total [as N]91919October 31, 2025220% over the limit
Nitrogen, ammonia total [as N]62517October 31, 2025565% over the limit
BOD, 5-day, 20 deg. C01616December 31, 2014552% over the limit
Enterococci21514March 31, 202613,714,186% over the limit
Coliform, fecal general31611August 31, 20245,999,900% over the limit
Chlorine, total residual21311April 30, 2024694% over the limit
Zinc, total [as Zn]21410October 31, 20021,321% over the limit
BOD, carbonaceous [5 day, 20 C]15328June 30, 2022193% over the limit
Cyanide, total [as CN]0117August 31, 2005405% over the limit
Lead, total [as Pb]2153November 30, 2024131% over the limit
LC50 Static 48Hr Acute Pimephales promelas043March 31, 200443% over the limit
Cadmium, total [as Cd]262June 30, 2005630% over the limit
Aluminum, total [as Al]242January 31, 201922% over the limit
BOD, 5-day, percent removal032April 30, 201047% over the limit
Butyl benzyl phthalate031April 30, 2004285% over the limit
Solids, suspended percent removal121March 31, 202271% over the limit
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia121March 31, 200238% over the limit
Iron, total [as Fe]211July 31, 20268% over the limit
Nitrogen, nitrite total [as N]4110
Nitrogen, Kjeldahl, total [as N]460
Chemical Oxygen Demand [COD]060
Chromium, hexavalent [as Cr]240
Silver, total [as Ag]040
Solids, settleable230
Flow, in conduit or thru treatment plant230
Oil & Grease130
Nitrogen, nitrate total [as N]420
Selenium, total [as Se]220
Naphthalene020
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia110
Chem. oxygen demand [COD] % removal010
Nickel, total [as Ni]200
Phosphorus, ortho200
Cyanide, free available200
BOD, carb-5 day, 20 deg C, percent removal100

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

The newest 50 of 63.

DateWhat EPA recordedAgency
July 1, 2025Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
January 7, 2025PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]ST6
January 1, 2025Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
March 16, 2023Effluent Violations - Numeric effluent violationST6
March 16, 2023Effluent Violations - Unauthorized DischargeST6
March 16, 2023Management Practice Violations - Improper Operation and MaintenanceST6
March 10, 2023Effluent Violations - Numeric effluent violationST6
March 10, 2023Effluent Violations - Unauthorized DischargeST6
March 10, 2023Management Practice Violations - Improper Operation and MaintenanceST6
March 6, 2023Effluent Violations - Numeric effluent violationST6
March 6, 2023Effluent Violations - Unauthorized DischargeST6
March 6, 2023Management Practice Violations - Improper Operation and MaintenanceST6
March 1, 2023Effluent Violations - Numeric effluent violationST6
March 1, 2023Effluent Violations - Unauthorized DischargeST6
March 1, 2023Management Practice Violations - Improper Operation and MaintenanceST6
February 20, 2023Effluent Violations - Unauthorized DischargeST6
February 20, 2023Management Practice Violations - Improper Operation and MaintenanceST6
January 30, 2023Biosolids: Other Management Practice ViolationST6
January 30, 2023Effluent Violations - Unauthorized DischargeST6
January 30, 2023Management Practice Violations - Improper Operation and MaintenanceST6
December 1, 2022Biosolids: Other Management Practice ViolationST6
June 13, 2022Biosolids: Other Management Practice ViolationST6
June 13, 2022Management Practice Violations - Improper Operation and MaintenanceST6
June 10, 2022Biosolids: Other Management Practice ViolationST6
June 10, 2022Effluent Violations - Numeric effluent violationST6
June 10, 2022Management Practice Violations - Improper Operation and MaintenanceST6
June 8, 2022Biosolids: Other Management Practice ViolationST6
June 8, 2022Effluent Violations - Numeric effluent violationST6
June 8, 2022Management Practice Violations - Improper Operation and MaintenanceST6
June 7, 2022Biosolids: Other Management Practice ViolationST6
June 7, 2022Effluent Violations - Numeric effluent violationST6
June 7, 2022Management Practice Violations - Improper Operation and MaintenanceST6
June 6, 2022Biosolids: Other Management Practice ViolationST6
June 6, 2022Effluent Violations - Numeric effluent violationST6
June 6, 2022Management Practice Violations - Improper Operation and MaintenanceST6
March 25, 2022Effluent Violations - Numeric effluent violationST6
March 25, 2022Effluent Violations - Unapproved BypassST6
March 25, 2022Management Practice Violations - Improper Operation and MaintenanceST6
March 25, 2022Permit Violations - Unapproved OperationST6
March 25, 2022Reporting Violations - Failure to NotifyST6
March 24, 2022Effluent Violations - Numeric effluent violationST6
March 24, 2022Effluent Violations - Unapproved BypassST6
March 24, 2022Management Practice Violations - Improper Operation and MaintenanceST6
March 24, 2022Permit Violations - Unapproved OperationST6
March 24, 2022Reporting Violations - Failure to NotifyST6
March 23, 2022Effluent Violations - Numeric effluent violationST6
March 23, 2022Effluent Violations - Unapproved BypassST6
March 23, 2022Management Practice Violations - Improper Operation and MaintenanceST6
March 23, 2022Permit Violations - Unapproved OperationST6
March 23, 2022Reporting Violations - Failure to NotifyST6

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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How we handle your data → Privacy

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 RI0100111 there.

Nearby on the register

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