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Woonsocket, RI Tap Water Quality 2026

Water quality report for Woonsocket, RI — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Woonsocket's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Woonsocket Water Division PWSID: RI1559518 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 6.60 ppb, 44% of the action level and no violations are open. PFAS was detected below the federal limit.

B

Woonsocket earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 6.60 ppb — 44% of the federal action level
PFAS detected below the federal limit
21 violations since 2015, 1 health-based
No violations currently open
Woonsocket's lead level vs. all Rhode Island community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 6.60 ppb — 44% of the federal action level
✓ Lower lead than 12% of Rhode Island utilities
Population Served
43217
~9776 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
21 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
44% of EPA action level
6.60 ppb
Action level: 15 ppb
The 90th-percentile lead result is 6.60 ppb, 44% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
Consumer Confidence Rule OTHER — — 2025 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2021 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2021 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2021 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2021 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2021 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2021 Resolved
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2019 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2019 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2019 Resolved
Fluoride MONITORING AND REPORTING — 4.0 mg/L 2019 Resolved
Acrylamide MONITORING AND REPORTING — TT 2018 Resolved
Epichlorohydrin MONITORING AND REPORTING — TT 2018 Resolved
E. COLI MONITORING AND REPORTING — 0 2016 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2016 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2016 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

21 violations are on record since 2015, of which 1 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Woonsocket Water Division
PWSID RI1559518
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 43,217
Service connections 9,776
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Woonsocket tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 6.60 ppb, 44% of the action level.
Does Woonsocket water have PFAS? ▼
PFAS was detected but stayed below the federal limit.
Who supplies water to Woonsocket? ▼
Woonsocket Water Division (PWSID RI1559518), one of 2 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2023-10-16. No significant deficiencies were recorded.

What Should Woonsocket Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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