Public water system · IL0311650
ActiveLincolnwood
At a glance
Lincolnwood (PWSID IL0311650) is an active community water system in Cook County, Illinois. It reports serving 13,463 people through 4,265 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
13,463
Service connections
4,265
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Lincolnwood compare with other water systems in Cook County?
By EPA's size categories, Lincolnwood is a large system (10,001 to 100,000 people). Cook County has 251 active public water systems. Its population served is about 36% below the county average of 20,993 people per system, and accounts for 0.3% 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 Lincolnwood is about twice 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 Lincolnwood?
EPA lists Lincolnwood 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 Lincolnwood have drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in July 2025. The violations listed here began between December 1992 and July 2025. By type: 1 reporting and 1 required treatment not met. The contaminants or rules involved are Lead and Copper Rule Revisions and Lead and Copper Rule. EPA lists 2 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 |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Resolved |
| 1992-12-07 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
All 2 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.
Lincolnwood: frequently asked questions
Who runs Lincolnwood?
Lincolnwood (PWSID IL0311650) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Lincolnwood serve?
Lincolnwood reports serving 13,463 people through 4,265 service connections in Cook County, Illinois.
Where does Lincolnwood 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 Lincolnwood have any drinking water violations?
EPA's records list 2 violations for this system; 1 is 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 Lincolnwood'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 2 violations for this system; 1 is 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 Lincolnwood's water quality report?
As a community water system, Lincolnwood 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, “Lincolnwood, PWSID IL0311650, Illinois”, https://aquacensus.com/water-systems/illinois/lincolnwood-il0311650 (data as of October 1, 2026).