Westerly Wastewater Treatment Facility
87 Margin Street, Westerly, RI 02891 · Washington County · Publicly Owned Treatment Works
- Average flow
- 1.97 MGD
- Design flow
- 3.3 MGD
- NPDES permit
- RI0100064
- Administratively continued
- Permit expires
- September 2026
- Population served
- 16,500
- CWNS 2022
Westerly Wastewater Treatment Facility is a publicly owned wastewater treatment works in Westerly, Washington County, Rhode Island treating an average of 1.97 million gallons per day against a permitted design capacity of 3.3 MGD, serving about 16,500 residents. It discharges under NPDES permit RI0100064 (administratively continued), which expires in September 2026, with 7 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in April 2010.
Treatment technology
2 treatment structures and unit processes identified at Westerly Wastewater Treatment Facility.
Available with a free Klarifi account
See the full treatment train at Westerly Wastewater Treatment Facility: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 7
- Effluent violations
- 7
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Westerly Wastewater Treatment Facility in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Penalties assessed
- $3,000
- all cases
- Compliance actions
- $2,000
- required by EPA orders
- EPA inspections
- 1
- latest Aug 2009
Latest case · Apr 2010
WESTERLY WWTF
Administrative order · CWA, SPCC and/or Federal Response Plan Violations · Final Order With Penalty · Penalty $3,000 · Compliance actions $2,000
EPA's description of the case:
“On 4/26/10, EPA settled an expedited CWA administrative penalty action against the City of Westerly, RI for its failure to implement an SPCC plan. The City agreed to pay a penalty of $3,000.”
Source: EPA ECHO, civil enforcement case 01-2010-2035.
Full case history with a free Klarifi account
Every action against Westerly Wastewater Treatment Facility with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Capital improvement projects in Westerly
Westerly's capital improvement plan lists 15 water, sewer and wastewater line items worth $62M starting 2025–2026. The largest budgeted items are shown here.
All water and sewer capital projects in Westerly →
| Project | Budget | Years |
|---|---|---|
| RIDEM Upgrade Requirements (Design 2024) (Construction TBD) | $50,000,000 | 2026–2026 |
| Disinfection System Upgrade | $2,080,000 | 2025–2029 |
| Pipeline Rehabilitation | $1,500,000 | 2025–2029 |
| Sewer Evaluation Study | $1,250,000 | 2025–2029 |
| Water Main - Bowling Lane | $1,100,000 | 2025–2026 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
22 verified contacts for Westerly Wastewater Treatment Facility, with validated emails and direct phone numbers.
Unlock 22 verified contacts (19 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Westerly Wastewater Treatment Facility, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Rhode Island
Narragansett · 19 mi away
0.56 MGD
New Shoreham · 20 mi away
0.13 MGD
Jamestown · 27 mi away
0.29 MGD
North Kingstown · 27 mi away
0.6 MGD
East Greenwich · 29 mi away
0.82 MGD
Newport · 29 mi away
7.15 MGD
Cranston · 34 mi away
7.48 MGD
Bristol · 36 mi away
3.17 MGD
Westerly Wastewater Treatment Facility: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026; facility record last updated May 25, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms