How many wastewater treatment plants are there in Rhode Island?

Klarifi tracks 14 publicly owned wastewater treatment plants in Rhode Island with a combined average flow of 40 million gallons per day, serving about 378,973 residents. 8 of them treat more than 1 MGD and 1 more than 10 MGD.

What is the largest wastewater treatment plant in Rhode Island?

Narragansett Bay Commission Bucklin Point in East Providence (rumford) is the largest plant in Rhode Island by average flow, treating about 16.27 MGD.

What treatment technologies are common in Rhode Island?

0 of Rhode Island's plants use lagoon systems and 5 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in Rhode Island are up for renewal?

2 permits held by Rhode Island plants expire in 2026 and 0 in 2027. Renewals typically bring new limits and trigger upgrade projects.

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Wastewater Treatment Plants in Rhode Island

Name: Wastewater treatment plants in Rhode Island
Creator: Klarifi
License: https://klarifi.io/terms-of-service

14 facilities · 40 MGD combined flow

Klarifi tracks 14 publicly owned wastewater treatment plants in Rhode Island with a combined average flow of 40 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 16.27 MGD. 2 NPDES permits expire this year and 0 next year.

Every plant below links to a profile with average and design flow, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city.

14 plant locations in Rhode Island; dot size follows average flow.

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.

All NPDES permits in Rhode Island →Find plants near you on the map →

Largest wastewater treatment plants in Rhode Island

The 14 largest publicly owned wastewater treatment plants in Rhode Island by average flow, with NPDES permit, expiry, treatment technology and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Narragansett Bay Commission Bucklin Point	East Providence (rumford)	16.27	—	RIR50T002	Aug 2029	Clarifiers, Biogas silos	8
Cranston Water Pollution Control Facility	Cranston	5.3	—	RIL100013	Dec 2030	Clarifiers, Biogas balloons	6
Newport Water Pollution Control Facility	Newport	5.3	10.7	RI0100293	May 2020	Clarifiers	24
East Providence WWTF	East Providence	4.4	14.2	RI0100048	Sep 2028	Clarifiers, Biogas silos, Biogas balloons	70
Bristol Wastewater Treatment Facility	Bristol	2.14	3.79	RI0100005	Mar 2028	Clarifiers, Carrousels / oxidation ditches, Biogas silos	25
Westerly Wastewater Treatment Facility	Westerly	1.56	3.3	RI0100064	Sep 2026	Clarifiers, Biogas silos	7
Smithfield Wastewater Treatment Plant	Smithfield	1.35	3.5	RI0100251	Jun 2026	Clarifiers	3
Warren WWTF	Warren	1.19	3.43	RI0100056	Dec 2030	Clarifiers	56
Burrillville Wastewater Treatment Plant	Burrillville	0.66	1.5	RI0100455	Jun 2025	Clarifiers	36
East Greenwich WWTF	East Greenwich	0.63	1.7	RI0100030	Sep 2023	Clarifiers	7
Quonset Point Wastewater Treatment Facility	North Kingstown	0.41	1.78	RI0100404	Dec 2030	Clarifiers	74
Scarborough Wastewater Treatment Facility	Narragansett	0.39	1.4	RI0100188	Sep 2028	Clarifiers, Carrousels / oxidation ditches	113
New Shoreham WWTF	New Shoreham	0.17	0.45	RI0100196	Jun 2029	—	149
Jamestown Wastewater Treatment Facility	Jamestown	0.1	0.73	RI0100366	Jun 2029	Clarifiers	112

The 50 largest plants in Rhode Island →Rhode Island capital improvement plans →

Rhode Island plants by treatment technology

Activated sludge and clarifiers (13)Anaerobic digesters and biogas (5)

All 14 plants in Rhode Island

Facility	City	Flow (MGD)
Narragansett Bay Commission Bucklin Point	East Providence (rumford)	16.27
Cranston Water Pollution Control Facility	Cranston	5.3
Newport Water Pollution Control Facility	Newport	5.3
East Providence WWTF	East Providence	4.4
Bristol Wastewater Treatment Facility	Bristol	2.14
Westerly Wastewater Treatment Facility	Westerly	1.56
Smithfield Wastewater Treatment Plant	Smithfield	1.35
Warren WWTF	Warren	1.19
Burrillville Wastewater Treatment Plant	Burrillville	0.66
East Greenwich WWTF	East Greenwich	0.63
Quonset Point Wastewater Treatment Facility	North Kingstown	0.41
Scarborough Wastewater Treatment Facility	Narragansett	0.39
New Shoreham WWTF	New Shoreham	0.17
Jamestown Wastewater Treatment Facility	Jamestown	0.1

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 September 11, 2026.

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