Wastewater treatment plants in Rhode Island
14 facilities · 50 MGD combined flow
Klarifi tracks 14 publicly owned wastewater treatment plants in Rhode Island with a combined average flow of 50 MGD, serving about 378,973 residents. 8 plants treat more than 1 MGD and 1 more than 10 MGD; 0 use lagoon systems and 5 have digesters or biogas infrastructure. The largest is Narragansett Bay Commission Bucklin Point in East Providence (rumford) at 17.77 MGD. 2 NPDES permits expire this year and 0 next year.
Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account.
14 plant locations in Rhode Island; dot size follows average flow. Boundaries: U.S. Census Bureau.
NPDES permits and renewals in Rhode Island
Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.
Largest wastewater treatment plants in Rhode Island
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| Narragansett Bay Commission Bucklin Point | East Providence (rumford) | 17.77 | — | RIR50T002 | Aug 2029 | 8 |
| Cranston Water Pollution Control Facility | Cranston | 7.48 | — | RIL100013 | Dec 2030 | 5 |
| Newport Water Pollution Control Facility | Newport | 7.15 | 10.7 | RI0100293 | May 2020 | 24 |
| East Providence WWTF | East Providence | 5.45 | 14.2 | RI0100048 | Sep 2028 | 70 |
| Bristol Wastewater Treatment Facility | Bristol | 3.17 | 3.79 | RI0100005 | Mar 2028 | 29 |
| Westerly Wastewater Treatment Facility | Westerly | 1.97 | 3.3 | RI0100064 | Sep 2026 | 7 |
| Warren WWTF | Warren | 1.78 | 3.43 | RI0100056 | Dec 2030 | 56 |
| Smithfield Wastewater Treatment Plant | Smithfield | 1.64 | 3.5 | RI0100251 | Jun 2026 | 3 |
| Burrillville Wastewater Treatment Plant | Burrillville | 0.86 | 1.5 | RI0100455 | Jun 2025 | 39 |
| East Greenwich WWTF | East Greenwich | 0.82 | 1.7 | RI0100030 | Sep 2023 | 31 |
Treatment technology for each plant is shown with a free Klarifi account. Create one →
Rhode Island plants by treatment technology
All 14 plants in Rhode Island
| Facility | City | Flow (MGD) |
|---|---|---|
| Narragansett Bay Commission Bucklin Point | East Providence (rumford) | 17.77 |
| Cranston Water Pollution Control Facility | Cranston | 7.48 |
| Newport Water Pollution Control Facility | Newport | 7.15 |
| East Providence WWTF | East Providence | 5.45 |
| Bristol Wastewater Treatment Facility | Bristol | 3.17 |
| Westerly Wastewater Treatment Facility | Westerly | 1.97 |
| Warren WWTF | Warren | 1.78 |
| Smithfield Wastewater Treatment Plant | Smithfield | 1.64 |
| Burrillville Wastewater Treatment Plant | Burrillville | 0.86 |
| East Greenwich WWTF | East Greenwich | 0.82 |
| Quonset Point Wastewater Treatment Facility | North Kingstown | 0.6 |
| Scarborough Wastewater Treatment Facility | Narragansett | 0.56 |
| Jamestown Wastewater Treatment Facility | Jamestown | 0.29 |
| New Shoreham WWTF | New Shoreham | 0.13 |
Wastewater treatment in Rhode Island: 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.
Wastewater terms: WWTP · POTW · MGD · NPDES permit · Equalization tank · Centrate · all terms
Cite this page
Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.
Klarifi. “Wastewater treatment plants in Rhode Island.” Updated October 26, 2026. https://klarifi.io/facilities/rhode-islandNeed a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.