Westborough, MA Tap Water Quality 2026

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

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

Main Utility: Westborough Water Department PWSID: MA2328000 Updated: 2026 Q2

✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS was detected below the federal limit.

Westborough earns a B for water quality

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

Lead: not detected

PFAS detected below the federal limit

58 violations since 2015, 2 health-based

No violations currently open

Westborough's lead level vs. all Massachusetts community water systems

0 ppb5 ppb10 ppb15 ppb

Lead level: Not detected — 0% of the federal action level

✓ Lower lead than % of Massachusetts utilities

Population Served

21556

~5439 connections

Water Source

Surface water

Drawn from surface water — SDWIS source code SW

Active Violations

58 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)

90th percentile of tap samples collected across the distribution system

0% of EPA action level

Not detected

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.

510% of EPA action level

6,630 ppb

Action level: 1,300 ppb

Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

Contaminant	Type	Measured	Limit	Period	Status
Surface Water Treatment Rule	TREATMENT TECHNIQUE	—	—	2025	Resolved
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2023	Resolved
Arsenic	MONITORING AND REPORTING	—	0.010 mg/L	2023	Resolved
Ethylbenzene	MONITORING AND REPORTING	—	0.7 mg/L	2023	Archived
Styrene	MONITORING AND REPORTING	—	0.1 mg/L	2023	Archived
Tetrachloroethylene	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
Toluene	MONITORING AND REPORTING	—	1 mg/L	2023	Archived
p-Dichlorobenzene	MONITORING AND REPORTING	—	0.075 mg/L	2023	Archived
Xylenes, Total	MONITORING AND REPORTING	—	10 mg/L	2023	Archived
DICHLOROMETHANE	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
1,1,2-Trichloroethane	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
1,2,4-Trichlorobenzene	MONITORING AND REPORTING	—	0.07 mg/L	2023	Archived
Benzene	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
Carbon tetrachloride	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
1,1-Dichloroethylene	MONITORING AND REPORTING	—	0.007 mg/L	2023	Archived
1,2-Dichloroethane	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
Trichloroethylene	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
1,1,1-Trichloroethane	MONITORING AND REPORTING	—	0.2 mg/L	2023	Archived
Vinyl chloride	MONITORING AND REPORTING	—	0.002 mg/L	2023	Archived
CHLOROBENZENE	MONITORING AND REPORTING	—	0.1 mg/L	2023	Archived
o-Dichlorobenzene	MONITORING AND REPORTING	—	0.6 mg/L	2023	Archived
trans-1,2-Dichloroethylene	MONITORING AND REPORTING	—	0.1 mg/L	2023	Archived
cis-1,2-Dichloroethylene	MONITORING AND REPORTING	—	0.07 mg/L	2023	Archived
1,2-Dichloropropane	MONITORING AND REPORTING	—	0.005 mg/L	2023	Archived
Revised Total Coliform Rule	MONITORING FAILURE	—	—	2023	Resolved
LASSO	MONITORING AND REPORTING	—	—	2022	Resolved
Atrazine	MONITORING AND REPORTING	—	0.003 mg/L	2022	Resolved
Carbofuran	MONITORING AND REPORTING	—	0.04 mg/L	2022	Resolved
Chlordane	MONITORING AND REPORTING	—	0.002 mg/L	2022	Resolved
2,4-D	MONITORING AND REPORTING	—	0.07 mg/L	2022	Resolved
Endrin	MONITORING AND REPORTING	—	0.002 mg/L	2022	Resolved
ETHYLENE DIBROMIDE	MONITORING AND REPORTING	—	0.00005 mg/L	2022	Resolved
Heptachlor epoxide	MONITORING AND REPORTING	—	0.0002 mg/L	2022	Resolved
Heptachlor	MONITORING AND REPORTING	—	0.0004 mg/L	2022	Resolved
Pentachlorophenol	MONITORING AND REPORTING	—	0.001 mg/L	2022	Resolved
Toxaphene	MONITORING AND REPORTING	—	0.003 mg/L	2022	Resolved
2,4,5-TP	MONITORING AND REPORTING	—	0.05 mg/L	2022	Resolved
Methoxychlor	MONITORING AND REPORTING	—	0.04 mg/L	2022	Resolved
BHC-GAMMA	MONITORING AND REPORTING	—	0.0002 mg/L	2022	Resolved
Total Polychlorinated Biphenyls (PCB)	MONITORING AND REPORTING	—	0.0005 mg/L	2022	Resolved
1,2-DIBROMO-3-CHLOROPROPANE	MONITORING AND REPORTING	—	0.0002 mg/L	2022	Resolved
Benzo(a)pyrene	MONITORING AND REPORTING	—	0.0002 mg/L	2022	Resolved
Dalapon	MONITORING AND REPORTING	—	0.2 mg/L	2022	Resolved
Di(2-ethylhexyl) adipate	MONITORING AND REPORTING	—	0.4 mg/L	2022	Resolved
Di(2-ethylhexyl) phthalate	MONITORING AND REPORTING	—	0.006 mg/L	2022	Resolved
Dinoseb	MONITORING AND REPORTING	—	0.007 mg/L	2022	Resolved
Diquat	MONITORING AND REPORTING	—	0.02 mg/L	2022	Resolved
Endothall	MONITORING AND REPORTING	—	0.1 mg/L	2022	Resolved
Glyphosate	MONITORING AND REPORTING	—	0.7 mg/L	2022	Resolved
HEXACHLOROBENZENE	MONITORING AND REPORTING	—	0.001 mg/L	2022	Resolved
Hexachlorocyclopentadiene	MONITORING AND REPORTING	—	0.05 mg/L	2022	Resolved
OXAMYL	MONITORING AND REPORTING	—	0.2 mg/L	2022	Resolved
Picloram	MONITORING AND REPORTING	—	0.5 mg/L	2022	Resolved
Simazine	MONITORING AND REPORTING	—	0.004 mg/L	2022	Resolved
2,3,7,8-TCDD	MONITORING AND REPORTING	—	0.00000003 mg/L	2022	Resolved
Arsenic	MONITORING AND REPORTING	—	0.010 mg/L	2022	Resolved
Coliform (TCR)	MCL EXCEEDANCE	—	5% of samples	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

58 violations are on record since 2015, of which 2 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Westborough Water Department

PWSID MA2328000

Water source Surface water — Drawn from surface water — SDWIS source code SW

Population served 21,556

Service connections 5,439

Systems serving this area 3

Regulator State primacy agency

Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Westborough tap water safe to drink? ▼

No federal limit is exceeded on record. No violations are currently open.

Does Westborough water have PFAS? ▼

PFAS was detected but stayed below the federal limit.

Who supplies water to Westborough? ▼

Westborough Water Department (PWSID MA2328000), one of 3 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 2026-04-07. No significant deficiencies were recorded.

What Should Westborough Residents Do?

Read your annual water report

Your supplier publishes a Consumer Confidence Report each July covering the prior year.

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.

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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