Public water system · IL0314480

Active

Hanover Park

At a glance

Hanover Park (PWSID IL0314480) is an active community water system in Cook County, Illinois. It reports serving 37,470 people through 10,838 service connections. Its primary water source is purchased 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 October 2025.

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

Population served

37,470

Service connections

10,838

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDIL0314480

System typeCommunity water system

Activity statusActive

Population served37,470

Service connections10,838

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedHanover Park

StateIllinois

ZIP—

CountyCook County

How does Hanover Park compare with other water systems in Cook County?

By EPA's size categories, Hanover Park is a large system (10,001 to 100,000 people). Cook County has 251 active public water systems. Its population served is about 78% above the county average of 20,993 people per system, and accounts for 0.7% of the 5,269,212 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active community water system reports serving 6,703 people, so Hanover Park is about 5.6 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. Illinois has 1,773 active community water systems, 46% of the state's 3,872 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 619 Illinois systems (16%) list purchased surface water as their primary source.

Who owns and regulates Hanover Park?

EPA lists Hanover Park as owned by a local government. The IL state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 134 of the 251 active systems in Cook County (53%) are also owned by a local government.

Does Hanover Park have drinking water violations?

Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2025. The violations listed here began between January 2002 and October 2025. By type: 10 monitoring and reporting, 1 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminants or rules involved are Total trihalomethanes (TTHM), Consumer Confidence Rule, Simazine and Benzo(a)pyrene. EPA lists 10 as resolved, 1 as archived and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2025-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Archived
2025-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72	Consumer Confidence Rulecode 7000	No	Unaddressed
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Simazinecode 2037	No	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Benzo(a)pyrenecode 2306	No	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Di(2-ethylhexyl) phthalatecode 2039	No	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Alachlor (Lasso)code 2051	No	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Di(2-ethylhexyl) adipatecode 2035	No	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Atrazinecode 2050	No	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
2002-01-01	Monitoring and reportingMonitoring, Regular · code 03	Seleniumcode 1045	No	Resolved
2002-01-01	Monitoring and reportingMonitoring, Regular · code 03	Fluoridecode 1025	No	Resolved
2002-01-01	Monitoring and reportingMonitoring, Regular · code 03	Berylliumcode 1075	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.

Hanover Park: frequently asked questions

Who runs Hanover Park?

Hanover Park (PWSID IL0314480) is a community water system owned by a local government. It is regulated by the IL state drinking water program.

How many people does Hanover Park serve?

Hanover Park reports serving 37,470 people through 10,838 service connections in Cook County, Illinois.

Where does Hanover Park get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does Hanover Park 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 October 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 Hanover Park'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 October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.

Where can I find Hanover Park's water quality report?

As a community water system, Hanover Park 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 Cook County

Water system	County	Population served	Type	Source
Chicago	Cook	2,721,308	Community	Surface water
Cicero	Cook	83,000	Community	Purchased surface water
Schaumburg	Cook	75,750	Community	Purchased surface water
Evanston	Cook	74,486	Community	Surface water
Arlington Heights	Cook	73,320	Community	Purchased surface water
Palatine	Cook	70,875	Community	Purchased 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, “Hanover Park, PWSID IL0314480, Illinois”, https://aquacensus.com/water-systems/illinois/hanover-park-il0314480 (data as of October 1, 2026).