Public water system · IL1110200

Active

Fox River Grove

At a glance

Fox River Grove (PWSID IL1110200) is an active community water system in McHenry County, Illinois. It reports serving 4,702 people through 1,642 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, 5 are health-based, and the most recent began in July 2020.

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

Population served

4,702

Service connections

1,642

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDIL1110200

System typeCommunity water system

Activity statusActive

Population served4,702

Service connections1,642

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedFox River Grove

StateIllinois

ZIP—

CountyMcHenry County

How does Fox River Grove compare with other water systems in McHenry County?

By EPA's size categories, Fox River Grove is a medium system (3,301 to 10,000 people). McHenry County has 192 active public water systems. Its population served is about 3.5 times the county average of 1,331 people per system, and accounts for 1.8% of the 255,516 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 Fox River Grove is about 30% below 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,808 Illinois systems (73%) list groundwater as their primary source.

Who owns and regulates Fox River Grove?

EPA lists Fox River Grove 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. 35 of the 192 active systems in McHenry County (18%) are also owned by a local government.

Does Fox River Grove have drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in July 2020. The violations listed here began between January 1992 and July 2020. By type: 6 monitoring and reporting, 3 required treatment not met, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (5 of them). EPA lists 7 as resolved and 5 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
2020-07-01	Required treatment not metWQP Entry Point/Tap Treatment Technique Non-Compliance · code 59	Lead and Copper Rulecode 5000	Yes	Resolved
2014-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72	Consumer Confidence Rulecode 7000	No	Resolved
2009-10-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2008-01-01	Monitoring and reportingWater Quality Parameter M/R · code 53	Lead and Copper Rulecode 5000	No	Resolved
2006-01-01	Required treatment not metWQP Entry Point/Tap Treatment Technique Non-Compliance · code 59	Lead and Copper Rulecode 5000	Yes	Resolved
2004-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2000-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1998-07-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
1998-03-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
1994-08-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
1992-12-07	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved
1992-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Trichloroethylenecode 2984	Yes	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.

Fox River Grove: frequently asked questions

Who runs Fox River Grove?

Fox River Grove (PWSID IL1110200) is a community water system owned by a local government. It is regulated by the IL state drinking water program.

How many people does Fox River Grove serve?

Fox River Grove reports serving 4,702 people through 1,642 service connections in McHenry County, Illinois.

Where does Fox River Grove 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 Fox River Grove have any drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in July 2020. 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 Fox River Grove'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, 5 are health-based, and the most recent began in July 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.

Where can I find Fox River Grove's water quality report?

As a community water system, Fox River Grove 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 McHenry County

Water system	County	Population served	Type	Source
Crystal Lake	McHenry	40,661	Community	Groundwater
Algonquin	McHenry	30,700	Community	Groundwater
Lake in the Hills	McHenry	28,661	Community	Groundwater
Huntley	McHenry	28,495	Community	Groundwater
Woodstock	McHenry	25,630	Community	Groundwater
Mchenry	McHenry	22,335	Community	Groundwater

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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, “Fox River Grove, PWSID IL1110200, Illinois”, https://aquacensus.com/water-systems/illinois/fox-river-grove-il1110200 (data as of October 1, 2026).