Public water system · IL0970500
ActiveHighland Park
At a glance
Highland Park (PWSID IL0970500) is an active community water system in Lake County, Illinois. It reports serving 30,176 people through 10,436 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in April 2005.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30,176
Service connections
10,436
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Highland Park compare with other water systems in Lake County?
By EPA's size categories, Highland Park is a large system (10,001 to 100,000 people). Lake County has 266 active public water systems, and Highland Park is the 5th-largest of them by population served. Its population served is about 12 times the county average of 2,442 people per system, and accounts for 4.6% of the 649,474 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 Highland Park is about 4.5 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 89 Illinois systems (2.3%) list surface water as their primary source.
Who owns and regulates Highland Park?
EPA lists Highland 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. 60 of the 266 active systems in Lake County (23%) are also owned by a local government.
Does Highland Park have drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in April 2005. The violations listed here began between June 1977 and April 2005. By type: 2 required treatment not met and 1 monitoring and reporting. The contaminants or rules involved are Interim Enhanced Surface Water Treatment Rule, Lead and Copper Rule and Gross alpha (excluding radon and uranium). EPA lists 2 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 |
|---|---|---|---|---|
| 2005-04-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 1995-01-01 | Required treatment not metPublic Education · code 65 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 3 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.
Highland Park: frequently asked questions
Who runs Highland Park?
Highland Park (PWSID IL0970500) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Highland Park serve?
Highland Park reports serving 30,176 people through 10,436 service connections in Lake County, Illinois.
Where does Highland Park get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Highland Park have any drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in April 2005. 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 Highland 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. EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in April 2005. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Highland Park's water quality report?
As a community water system, Highland 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 Lake County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Waukegan | Lake | 87,149 | Community | Surface water |
| Vernon Hills - Lake Co Pw | Lake | 33,207 | Community | Purchased surface water |
| Mundelein | Lake | 31,500 | Community | Purchased surface water |
| Gurnee | Lake | 30,193 | Community | Purchased surface water |
| Round Lake Beach | Lake | 27,200 | Community | Purchased surface water |
| Zion | Lake | 24,442 | Community | Purchased surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Highland Park, PWSID IL0970500, Illinois”, https://aquacensus.com/water-systems/illinois/highland-park-il0970500 (data as of October 1, 2026).