Public water system · IL0312670

Active

Riverside

At a glance

Riverside (PWSID IL0312670) is an active community water system in Cook County, Illinois. It reports serving 9,298 people through 3,034 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in April 2025.

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

Population served

9,298

Service connections

3,034

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDIL0312670

System typeCommunity water system

Activity statusActive

Population served9,298

Service connections3,034

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedRiverside

StateIllinois

ZIP—

CountyCook County

How does Riverside compare with other water systems in Cook County?

By EPA's size categories, Riverside is a medium system (3,301 to 10,000 people). Cook County has 251 active public water systems. Its population served is about 56% below 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 Riverside is about 39% 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 Riverside?

EPA lists Riverside 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 Riverside have drinking water violations?

EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in April 2025. The violations listed here began between December 1992 and April 2025. By type: 6 monitoring and reporting, 4 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (4 of them). EPA lists 10 as resolved and 1 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
2025-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2025-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2012-12-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2012-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2008-05-16	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2007-04-01	Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26	Total coliform bacteria (TCR)code 3100	No	Resolved
1998-03-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
1996-01-01	Required treatment not metPublic Education · code 65	Lead and Copper Rulecode 5000	Yes	Resolved
1994-01-01	Required treatment not metPublic Education · code 65	Lead and Copper Rulecode 5000	Yes	Resolved
1993-01-01	Required treatment not metPublic Education · code 65	Lead and Copper Rulecode 5000	Yes	Resolved
1992-12-07	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved

All 11 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.

Riverside: frequently asked questions

Who runs Riverside?

Riverside (PWSID IL0312670) is a community water system owned by a local government. It is regulated by the IL state drinking water program.

How many people does Riverside serve?

Riverside reports serving 9,298 people through 3,034 service connections in Cook County, Illinois.

Where does Riverside 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 Riverside have any drinking water violations?

EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in April 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 Riverside'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 11 violations for this system; 4 are health-based, and the most recent began in April 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 Riverside's water quality report?

As a community water system, Riverside 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, “Riverside, PWSID IL0312670, Illinois”, https://aquacensus.com/water-systems/illinois/riverside-il0312670 (data as of October 1, 2026).