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Tisbury, MA Tap Water Quality 2026

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

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

Main Utility: Tisbury Water Works PWSID: MA4296000 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 7.20 ppb, 48% of the action level and no violations are open. No PFAS was detected.

C

Tisbury earns a C for water quality

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

Lead: 7.20 ppb — 48% of the federal action level
PFAS tested, none detected
17 violations since 2015, 1 health-based
No violations currently open
Tisbury's lead level vs. all Massachusetts community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 7.20 ppb — 48% of the federal action level
✓ Lower lead than 9% of Massachusetts utilities
Population Served
4792
~2846 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
17 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
48% of EPA action level
7.20 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
107.7% of EPA action level
1,400 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 7.20 ppb, 48% 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. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Consumer Confidence Rule OTHER — — 2022 Addressed
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2022 Archived
Mercury MONITORING AND REPORTING — 0.002 mg/L 2022 Archived
Selenium MONITORING AND REPORTING — 0.05 mg/L 2022 Archived
Barium MONITORING AND REPORTING — 2 mg/L 2022 Archived
Cadmium MONITORING AND REPORTING — 0.005 mg/L 2022 Archived
Chromium MONITORING AND REPORTING — 0.1 mg/L 2022 Archived
Antimony, Total MONITORING AND REPORTING — 0.006 mg/L 2022 Archived
Beryllium, Total MONITORING AND REPORTING — 0.004 mg/L 2022 Archived
Nickel MONITORING AND REPORTING — — 2022 Archived
Thallium, Total MONITORING AND REPORTING — 0.002 mg/L 2022 Archived
CYANIDE MONITORING AND REPORTING — 0.2 mg/L 2022 Archived
Asbestos MONITORING AND REPORTING — 7 MFL 2022 Archived
Fluoride MONITORING AND REPORTING — 4.0 mg/L 2022 Archived
Nitrate MONITORING AND REPORTING — 10 mg/L 2022 Archived
ENTEROCOCCI MONITORING AND REPORTING — TT 2020 Unaddressed
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 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

17 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 Tisbury Water Works
PWSID MA4296000
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 4,792
Service connections 2,846
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Tisbury tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 7.20 ppb, 48% of the action level.
Does Tisbury water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Tisbury? ▼
Tisbury Water Works (PWSID MA4296000), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-11-13. No significant deficiencies were recorded.

What Should Tisbury 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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