Public water system · IL0312640

Active

River Grove

At a glance

River Grove (PWSID IL0312640) is an active community water system in Cook County, Illinois. It reports serving 10,282 people through 2,620 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 3 are health-based, and the most recent began in July 2025.

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

Population served

10,282

Service connections

2,620

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDIL0312640

System typeCommunity water system

Activity statusActive

Population served10,282

Service connections2,620

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedRiver Grove

StateIllinois

ZIP—

CountyCook County

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

By EPA's size categories, River Grove is a large system (10,001 to 100,000 people). Cook County has 251 active public water systems. Its population served is about half of the county average of 20,993 people per system, and accounts for 0.2% 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 River Grove is about 53% 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. 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 River Grove?

EPA lists 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. 134 of the 251 active systems in Cook County (53%) are also owned by a local government.

Does River Grove have drinking water violations?

EPA's records list 9 violations for this system; 3 are health-based, and the most recent began in July 2025. The violations listed here began between December 1992 and July 2025. By type: 5 monitoring and reporting, 3 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (5 of them). EPA lists 9 as resolved. 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
2025-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2020-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2012-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72	Consumer Confidence Rulecode 7000	No	Resolved
2007-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2007-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2001-01-01	Required treatment not metWQP Entry Point/Tap Treatment Technique Non-Compliance · code 59	Lead and Copper Rulecode 5000	Yes	Resolved
2000-10-01	Required treatment not metWQP Entry Point/Tap Treatment Technique Non-Compliance · code 59	Lead and Copper Rulecode 5000	Yes	Resolved
1997-07-01	Monitoring and reportingWater Quality Parameter M/R · code 53	Lead and Copper Rulecode 5000	No	Resolved
1992-12-07	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved

All 9 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.

River Grove: frequently asked questions

Who runs River Grove?

River Grove (PWSID IL0312640) is a community water system owned by a local government. It is regulated by the IL state drinking water program.

How many people does River Grove serve?

River Grove reports serving 10,282 people through 2,620 service connections in Cook County, Illinois.

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

EPA's records list 9 violations for this system; 3 are health-based, and the most recent began in July 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 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. EPA's records list 9 violations for this system; 3 are health-based, and the most recent began in July 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 River Grove's water quality report?

As a community water system, 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 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, “River Grove, PWSID IL0312640, Illinois”, https://aquacensus.com/water-systems/illinois/river-grove-il0312640 (data as of October 1, 2026).