Public water system · MA2328000
ActiveWestborough Water Department
At a glance
Westborough Water Department (PWSID MA2328000) is an active community water system in Worcester County, Massachusetts. It reports serving 21,567 people through 5,439 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
21,567
Service connections
5,439
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Westborough Water Department compare with other water systems in Worcester County?
By EPA's size categories, Westborough Water Department is a large system (10,001 to 100,000 people). Worcester County has 346 active public water systems, and Westborough Water Department is the 6th-largest of them by population served. Its population served is about 9.6 times the county average of 2,239 people per system, and accounts for 2.8% of the 774,523 people reported by systems filed under the county. Across Massachusetts, the 1,636 active systems average 6,275 people each. Nationally, the average active community water system reports serving 6,703 people, so Westborough Water Department is about 3.2 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Massachusetts has 531 active community water systems, 32% of the state's 1,636 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 76 Massachusetts systems (4.6%) list surface water as their primary source.
Who owns and regulates Westborough Water Department?
EPA lists Westborough Water Department as owned by a local government. The MA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 80 of the 346 active systems in Worcester County (23%) are also owned by a local government.
Does Westborough Water Department have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in November 2025. The violations listed here began between April 2023 and November 2025. By type: 11 monitoring and reporting and 1 required treatment not met. The contaminants or rules involved are Surface Water Treatment Rule, Lead and Copper Rule, Arsenic and Dichloromethane. EPA lists 9 as archived and 3 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-11-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2023-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dichloromethanecode 2964 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Tetrachloroethylenecode 2987 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,1-Trichloroethanecode 2981 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Styrenecode 2996 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzenecode 2990 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Archived |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,2-Trichloroethanecode 2985 | No | Archived |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Westborough Water Department: frequently asked questions
Who runs Westborough Water Department?
Westborough Water Department (PWSID MA2328000) is a community water system owned by a local government. It is regulated by the MA state drinking water program.
How many people does Westborough Water Department serve?
Westborough Water Department reports serving 21,567 people through 5,439 service connections in Worcester County, Massachusetts.
Where does Westborough Water Department get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Westborough Water Department have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in November 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Westborough Water Department's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in November 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MA state drinking water program.
Where can I find Westborough Water Department's water quality report?
As a community water system, Westborough Water Department must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Worcester County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Worcester Dpwp, Water Supply Division | Worcester | 206,518 | Community | Surface water |
| Fitchburg Dpw Division of Water Supply | Worcester | 41,946 | Community | Surface water |
| Leominster Water Division | Worcester | 41,683 | Community | Surface water |
| Shrewsbury Water Department | Worcester | 38,325 | Community | Groundwater |
| Milford Water Department | Worcester | 30,379 | Community | Surface water |
| Gardner Water Department | Worcester | 21,381 | Community | Surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Westborough Water Department, PWSID MA2328000, Massachusetts”, https://aquacensus.com/water-systems/massachusetts/westborough-water-department-ma2328000 (data as of October 1, 2026).