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Hopkinton, MA Tap Water Quality 2026

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

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

Main Utility: Hopkinton Water Department PWSID: MA2139000 Updated: 2026 Q2
⚠️

PFAS above the federal limit at 1 of 3 sampling points

Lead is 7.40 ppb, 49% of the action level and no violations are open. However, PFAS exceeds the federal limit at 1 of 3 sampling points, running as high as 1.66 times the limit.

C

Hopkinton earns a C for water quality

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

Lead: 7.40 ppb — 49% of the federal action level
PFAS above the federal limit at 1 of 3 sampling points
No violations since 2015
No violations currently open
Hopkinton's lead level vs. all Massachusetts community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 7.40 ppb — 49% of the federal action level
✓ Lower lead than 8% of Massachusetts utilities
Population Served
14113
~4405 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
None on record since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
49% of EPA action level
7.40 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.
451.5% of EPA action level
5,870 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 7.40 ppb, 49% 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)

✓ No violations on record for this water system.
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

No violations are on record for this system since 2015. EPA records violations for every community water system, so this reflects a clean compliance history rather than missing data.

About the Main Water System

Utility Hopkinton Water Department
PWSID MA2139000
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 14,113
Service connections 4,405
Systems serving this area 10
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Hopkinton tap water safe to drink? ▼
It meets most federal standards, but PFAS exceeds the federal limit at 1 of 3 sampling points. No violations are currently open. Lead is 7.40 ppb, 49% of the action level.
Does Hopkinton water have PFAS? ▼
Yes. PFAS exceeds the federal limit at 1 of 3 sampling points, running as high as 1.66 times the limit. Limits are enforced on a running annual average at each sampling point, not on a single sample.
Who supplies water to Hopkinton? ▼
Hopkinton Water Department (PWSID MA2139000), one of 10 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-03-19. No significant deficiencies were recorded.

What Should Hopkinton Residents Do?

1
Consider a reverse-osmosis filter
Reverse osmosis removes more than 95% of PFAS. Standard carbon pitchers do not.
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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