Public water system · NJ1225001
ActiveMiddlesex Water Company
At a glance
Middlesex Water Company (PWSID NJ1225001) is an active community water system in Middlesex County, New Jersey. It reports serving 233,376 people through 58,344 service connections. Its primary water source is surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
233,376
Service connections
58,344
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Middlesex Water Company compare with other water systems in Middlesex County?
By EPA's size categories, Middlesex Water Company is a very large system (more than 100,000 people). Middlesex County has 36 active public water systems, and Middlesex Water Company is the largest of them by population served. Its population served is about 12 times the county average of 19,870 people per system, and accounts for 33% of the 715,306 people reported by systems filed under the county. Across New Jersey, the 3,496 active systems average 2,750 people each. Nationally, the average active community water system reports serving 6,703 people, so Middlesex Water Company is about 35 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. New Jersey has 582 active community water systems, 17% of the state's 3,496 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 29 New Jersey systems (0.8%) list surface water as their primary source.
Who owns and regulates Middlesex Water Company?
EPA lists Middlesex Water Company as privately owned. The NJ state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 21 of the 36 active systems in Middlesex County (58%) are also privately owned.
Does Middlesex Water Company have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2025. The violations listed here began between October 2015 and January 2025. By type: 8 monitoring and reporting, 3 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Lead and Copper Rule (8 of them). EPA lists 10 as resolved and 2 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Archived |
| 2023-04-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-02-10 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Resolved |
| 2022-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2020-07-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Archived |
| 2020-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2019-07-01 | Required treatment not metWQP Entry Point/Tap Treatment Technique Non-Compliance · code 59 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2018-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2018-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2017-07-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
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.
Middlesex Water Company: frequently asked questions
Who runs Middlesex Water Company?
Middlesex Water Company (PWSID NJ1225001) is a community water system privately owned. It is regulated by the NJ state drinking water program.
How many people does Middlesex Water Company serve?
Middlesex Water Company reports serving 233,376 people through 58,344 service connections in Middlesex County, New Jersey.
Where does Middlesex Water Company 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 Middlesex Water Company 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 January 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 Middlesex Water Company'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 January 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the NJ state drinking water program.
Where can I find Middlesex Water Company's water quality report?
As a community water system, Middlesex Water Company 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 Middlesex County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Old Bridge Mua | Middlesex | 68,000 | Community | Purchased surface water |
| New Brunswick W Dept | Middlesex | 55,000 | Community | Surface water |
| Perth Amboy Water Department | Middlesex | 52,328 | Community | Groundwater under influence of surface water |
| East Brunswick Water Utility | Middlesex | 49,715 | Community | Purchased surface water |
| South Brunswick Twp W Di | Middlesex + 1 more | 45,450 | Community | Purchased surface water |
| Sayreville W Dept | Middlesex | 45,345 | Community | Groundwater under influence of 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, “Middlesex Water Company, PWSID NJ1225001, New Jersey”, https://aquacensus.com/water-systems/new-jersey/middlesex-water-company-nj1225001 (data as of October 1, 2026).