All 26 systems met the sampling requirement for a yearly average. Of those systems, 7 had at least one yearly average above an EPA comparison level and 19 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Rhode Island may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Rhode Island drinking-water program →
Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
System counts in Rhode Island
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 7 | 26 | 26.9% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 4 | 26 | 15.4% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 26 | 0.0% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 26 | 0.0% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 26 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 0 | 26 | 0.0% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| BLOCK ISLAND WATER COMPANY | RI1858430 | 9,999 | Ground water | 1 | No available average above comparison levels |
| BRISTOL COUNTY WATER AUTHORITY | RI1647515 | 49,000 | Surface water purchased | 1 | No available average above comparison levels |
| CNE - NEW LONDON TURNPIKE ENTRY POINT | RI2980453 | 9,999 | Ground water purchased | 1 | No available average above comparison levels |
| CUMBERLAND, TOWN OF | RI1647530 | 21,235 | Surface water purchased | 5 | Above an EPA comparison level |
| EAST PROVIDENCE-CITY OF | RI1615610 | 47,618 | Surface water purchased | 1 | No available average above comparison levels |
| GREENVILLE WATER DISTRICT | RI1858410 | 9,500 | Surface water purchased | 1 | No available average above comparison levels |
| JAMESTOWN WATER DEPARTMENT | RI1858419 | 3,348 | Surface water | 1 | No available average above comparison levels |
| KENT COUNTY WATER AUTHORITY | RI1559511 | 94,107 | Surface water purchased | 5 | Above an EPA comparison level |
| KINGSTON WATER DISTRICT | RI1858421 | 3,968 | Ground water | 3 | Above an EPA comparison level |
| LINCOLN WATER COMMISSION | RI1858423 | 21,664 | Surface water purchased | 1 | No available average above comparison levels |
| NARRAGANSETT WATER DEPT-NORTH END | RI1858429 | 4,432 | Ground water purchased | 2 | No available average above comparison levels |
| NARRAGANSETT WATER SYSTEM-POINT JUDITH | RI1858428 | 8,210 | Ground water purchased | 1 | No available average above comparison levels |
| NAVAL STATION, NEWPORT | RI1000016 | 7,870 | Surface water purchased | 2 | No available average above comparison levels |
| NEWPORT-CITY OF | RI1592010 | 42,155 | Surface water | 2 | No available average above comparison levels |
| NORTH KINGSTOWN TOWN OF | RI1559517 | 27,732 | Ground water | 6 | Above an EPA comparison level |
| NORTH TIVERTON FIRE DISTRICT | RI1592018 | 8,969 | Surface water purchased | 2 | No available average above comparison levels |
| PAWTUCKET-CITY OF | RI1592021 | 98,130 | Surface water | 1 | No available average above comparison levels |
| PORTSMOUTH WATER & FIRE DISTRICT | RI1592022 | 17,090 | Surface water purchased | 1 | No available average above comparison levels |
| PROVIDENCE-CITY OF | RI1592024 | 333,142 | Surface water | 1 | No available average above comparison levels |
| SMITHFIELD WATER SUPPLY BOARD | RI1615616 | 9,460 | Surface water purchased | 1 | No available average above comparison levels |
| SOUTH KINGSTOWN-SOUTH SHORE | RI1615623 | 6,170 | Ground water | 2 | Above an EPA comparison level |
| SUEZ WATER RI | RI1615624 | 22,347 | Ground water | 2 | No available average above comparison levels |
| UNIVERSITY OF RHODE ISLAND | RI1858422 | 19,354 | Ground water | 1 | Above an EPA comparison level |
| WARWICK-CITY OF | RI1615627 | 73,289 | Surface water purchased | 3 | No available average above comparison levels |
| WESTERLY WATER DEPARTMENT | RI1559512 | 35,298 | Ground water | 7 | Above an EPA comparison level |
| WOONSOCKET WATER DIVISION | RI1559518 | 45,828 | Surface water | 1 | No available average above comparison levels |
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.