PFAS in Rhode Island tap water

11 of 29 tested systems measured above the federal limit. 15 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water systemHighest PFOAHighest PFOSFoundAgainst the 4 ppt limit
University of Rhode Island16 ppt5 ppt8 of 29Above
Quonset Business Park15 ppt5 ppt7 of 29Above
Westerly Water Department9 ppt7 ppt7 of 29Above
North Kingstown Town of8.1 ppt4.6 ppt6 of 29Above
Cumberland, Town of7.7 ppt6.7 ppt6 of 29Above
Kent County Water Authority7.5 pptnone detected6 of 29Above
Kingston Water District6.2 pptnone detected5 of 29Above
South Kingstown-south Shore6.1 pptnone detected4 of 29Above
Woonsocket Water Division5.8 pptnone detected5 of 29Above
North Tiverton Fire District5.1 pptnone detected2 of 29Above
Narragansett Water Dept-north End4.3 ppt4 ppt4 of 29Above
Block Island Water Companynone detectednone detected0 of 29Within
Bristol County Water Authoritynone detectednone detected0 of 29Within
Cne - New London Turnpike Entry Pointnone detectednone detected0 of 29Within
East Providence-city ofnone detectednone detected0 of 29Within
Greenville Water Districtnone detectednone detected0 of 29Within
Jamestown Water Departmentnone detectednone detected1 of 29Within
Lincoln Water Commissionnone detectednone detected0 of 29Within
Narragansett Water System-point Judithnone detectednone detected0 of 29Within
Naval Station, Newportnone detectednone detected3 of 29Within
Newport-city ofnone detectednone detected3 of 29Within
Pawtucket-city ofnone detectednone detected1 of 29Within
Ponaganset High Schoolnone detectednone detected0 of 29Within
Portsmouth Water & Fire Districtnone detectednone detected0 of 29Within
Providence-city ofnone detectednone detected0 of 29Within
Rhode Island Hospital - Lifespannone detectednone detected0 of 29Within
Smithfield Water Supply Boardnone detectednone detected0 of 29Within
Suez Water Rinone detectednone detected0 of 29Within
Warwick-city ofnone detectednone detected0 of 29Within

All 29 systems the EPA tested in Rhode Island, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →