Public water system · MA3119000

Active

Hamilton Water Dept

At a glance

Hamilton Water Dept (PWSID MA3119000) is an active community water system in Essex County, Massachusetts. It reports serving 7,674 people through 2,567 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in January 2019.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

7,674

Service connections

2,567

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDMA3119000

System typeCommunity water system

Activity statusActive

Population served7,674

Service connections2,567

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyMA state drinking water program

City servedHamilton

StateMassachusetts

ZIP01936

CountyEssex County

How does Hamilton Water Dept compare with other water systems in Essex County?

By EPA's size categories, Hamilton Water Dept is a medium system (3,301 to 10,000 people). Essex County has 67 active public water systems. Its population served is about 43% below the county average of 13,412 people per system, and accounts for 0.9% of the 898,585 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 Hamilton Water Dept is about 14% above 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,354 Massachusetts systems (83%) list groundwater as their primary source.

Who owns and regulates Hamilton Water Dept?

EPA lists Hamilton Water Dept 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. 39 of the 67 active systems in Essex County (58%) are also owned by a local government.

Does Hamilton Water Dept have drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in January 2019. The violations listed here began between July 2007 and January 2019. By type: 9 monitoring and reporting and 3 contaminant level above the legal limit. The contaminant or rule involved most often is Haloacetic acids (HAA5) (2 of them). EPA lists 10 as archived and 2 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
2019-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Archived
2011-11-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2009-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2007-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Archived
2007-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Archived
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Simazinecode 2037	No	Archived
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Hexachlorocyclopentadienecode 2042	No	Archived
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Lindane (gamma-BHC)code 2010	No	Archived
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Heptachlor epoxidecode 2067	No	Archived
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Ethylene dibromide (EDB)code 2946	No	Archived
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Heptachlorcode 2065	No	Archived
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Hexachlorobenzenecode 2274	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.

Hamilton Water Dept: frequently asked questions

Who runs Hamilton Water Dept?

Hamilton Water Dept (PWSID MA3119000) is a community water system owned by a local government. It is regulated by the MA state drinking water program.

How many people does Hamilton Water Dept serve?

Hamilton Water Dept reports serving 7,674 people through 2,567 service connections in Essex County, Massachusetts.

Where does Hamilton Water Dept get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Hamilton Water Dept have any drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in January 2019. 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 Hamilton Water Dept'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, 3 are health-based, and the most recent began in January 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the MA state drinking water program.

Where can I find Hamilton Water Dept's water quality report?

As a community water system, Hamilton Water Dept 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 Essex County

Water system	County	Population served	Type	Source
Lynn Water and Sewer Comm	Essex	101,253	Community	Surface water
Salem and Beverly Water Supply Board	Essex	90,330	Community	Surface water
Lawrence Water Works	Essex	89,143	Community	Surface water
Haverhill Water Dept	Essex	61,277	Community	Surface water
Peabody Water Dept.	Essex	54,481	Community	Surface water
Methuen Water Dept	Essex	53,059	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, “Hamilton Water Dept, PWSID MA3119000, Massachusetts”, https://aquacensus.com/water-systems/massachusetts/hamilton-water-dept-ma3119000 (data as of October 1, 2026).