Clean Water Act discharge permit · NPDES RI0100064
WESTERLY WWTF, Westerly, RI: NPDES RI0100064 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 17Pollutants with an effluent exceedance
WESTERLY WWTF, held by WESTERLY TOWN HALL, holds NPDES permit RI0100064, which discharges to Pawcatuck River. EPA’s file records it issued August 26, 2013 and expiring August 31, 2018. 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 | WESTERLY WWTF |
|---|---|
| Permittee as filed | WESTERLY TOWN HALL |
| NPDES ID | RI0100064 |
| 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 | August 26, 2013 |
| Expiration date | August 31, 2018 |
| Address | Westerly, RI 02891 |
| Receiving water | PAWCATUCK RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lower Pawcatuck River (HUC 010900050303) |
| Program components on file | POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler RID084813534 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 27Pollutants on file
- 26Under a numeric limit
- 27With a violation of any kind
- 17With 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 |
|---|---|---|---|---|---|
| Copper, total [as Cu] | 4 | 59 | 55 | October 31, 2025 | 196% over the limit |
| Solids, total suspended | 10 | 58 | 47 | February 28, 2017 | 154% over the limit |
| Coliform, fecal general | 2 | 34 | 31 | August 31, 2011 | 5,999,900% over the limit |
| Chlorine, total residual | 2 | 32 | 30 | November 30, 2017 | 2,892% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 27 | 27 | April 30, 2024 | 52% over the limit |
| BOD, 5-day, 20 deg. C | 10 | 35 | 25 | January 31, 2003 | 220% over the limit |
| Cyanide, total [as CN] | 4 | 29 | 21 | January 31, 2021 | 1,400% over the limit |
| NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulata | 1 | 23 | 21 | September 30, 2012 | 99,999% over the limit |
| LC50 Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 16 | 14 | September 30, 2012 | 99,999% over the limit |
| Enterococci | 2 | 14 | 14 | June 30, 2024 | 8,695,552% over the limit |
| Solids, suspended percent removal | 1 | 11 | 11 | April 30, 2010 | 166% over the limit |
| Solids, settleable | 3 | 12 | 9 | August 31, 2000 | 300% over the limit |
| pH | 2 | 10 | 8 | February 28, 2022 | |
| Nitrogen, total [as N] | 6 | 10 | 7 | May 31, 2016 | 47% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 6 | 4 | May 31, 2016 | 131% over the limit |
| Cyanide, Available | 0 | 2 | 2 | March 31, 2026 | 1,320% over the limit |
| BOD, 5-day, percent removal | 1 | 2 | 1 | August 31, 2002 | 9% over the limit |
| Chromium, total [as Cr] | 2 | 10 | 0 | ||
| Aluminum, total [as Al] | 2 | 10 | 0 | ||
| Lead, total [as Pb] | 2 | 8 | 0 | ||
| Zinc, total [as Zn] | 2 | 8 | 0 | ||
| Nickel, total [as Ni] | 2 | 6 | 0 | ||
| Nitrogen, nitrite total [as N] | 4 | 2 | 0 | ||
| Nitrogen, nitrate total [as N] | 4 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 4 | 2 | 0 | ||
| Cadmium, total [as Cd] | 2 | 2 | 0 | ||
| Oil & Grease | 1 | 2 | 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
- 10Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 6, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| June 6, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| May 16, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| April 3, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| March 29, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| March 9, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| March 7, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| February 23, 2017 | Pretreatment - Failure to Meet Inspection and Sampling Plan for SIUs | ST6 |
| February 23, 2017 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| February 23, 2017 | Pretreatment - Failure to Establish Self-Monitoring Requirements | 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 RI0100064 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.