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Counties → Illinois

DuPage County, Illinois

Water Systems
207
Population Served
861,775
Total Violations
15,779
540 health-based
PFAS Detected
7
of 32 tested

Violation Analysis

60.4%
Systems with Violations
76.2
Avg Violations per System
3.4%
Health-Based Violations

Water Source Types

SW
39 systems (19%)
GW
11 systems (5%)

PFAS Contamination

32
Systems Tested
7
PFAS Detected
21.9%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

DuPage Illinois water systems by violation status, EPA SDWIS records.

No violations on record (2) One or more violations (48)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Naperville 156,406 5 Clean
Wheaton 53,970 11 Clean
Downers Grove 49,425 36 Clean
Elmhurst 45,000 47 Detected
Lombard 44,476 13 Clean
Carol Stream 39,854 23 Detected
Addison 38,017 19 Clean
Woodridge 33,566 28 Clean
Glendale Heights 33,176 24 Clean
Glen Ellyn 28,850 18 Clean
West Chicago 25,166 148 Clean
Lisle 24,233 23 Clean
Westmont 24,161 37 Clean
Roselle 22,897 42 Clean
Villa Park 22,263 41 Clean
Bloomingdale 22,018 79 Clean
Darien 21,751 15 Clean
Bensenville 18,537 59 Clean
Hinsdale 17,900 11 Clean
Wood Dale 14,012 12 Clean
Warrenville 12,350 201 Clean
Burr Ridge 11,192 20 Clean
Winfield 9,835 43 Clean
Itasca 9,506 36 Detected
Oak Brook 9,400 54 Clean
Willowbrook 9,000 33 Clean
Clarendon Hills 8,702 14 Clean
Southeast Regional Water Facility 6,940 2 Clean
IL American-Valley View 6,721 3 Detected
IL American-Dupage Utility 6,613 15 -
Aqua Illinois-Oak Brook 5,361 1 -
IL American-Liberty Ridge West 3,307 12 Clean
Glen Ellyn Heights Subdivision 1,931 15 -
Steeple Run Sbdv 1,931 10 -
IL American-Arrowhead 1,581 6 -
Oakbrook Terrace 1,440 4 -
York Township Water System 1,423 172 -
IL American-Country Club 1,014 1 Clean
Liberty Park Homeowners Association 950 32 -
Prairie Path Water Company-Clarendon 850 27 Clean
Community Fellowship Church 800 1 -
North Regional Water Fac 770 153 -
IL American-Lombard Heights 679 1 -
Wayne School 625 107 -
Indian Knoll School Dist 33 600 292 -
Marianjoy Rehab Hospital 500 156 -
Hobson Valley Water System 400 2 -
IL American-Liberty Ridge East 320 9 -
Living Hope Bible Church 300 0 -
Blackwell Youth Camp Well Dw-002 300 0 -

Other Counties in Illinois

Cook County
427 systems · 5,304,996 served · 21,728 violations
Lake County
540 systems · 719,035 served · 33,311 violations
Will County
330 systems · 622,572 served · 37,818 violations
Kane County
191 systems · 592,544 served · 12,844 violations
McHenry County
307 systems · 271,051 served · 11,554 violations
Madison County
68 systems · 268,778 served · 1,940 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in DuPage County? ▼
DuPage County has 15,779 total drinking water violations across 207 water systems, of which 540 are health-based violations. 60.4% of systems have at least one violation.
How many people get water from DuPage County systems? ▼
Water systems in DuPage County serve approximately 861,775 people through 207 public water systems.
Has PFAS been detected in DuPage County water? ▼
Of 32 water systems tested for PFAS in DuPage County, 7 had PFAS detected (21.9% detection rate).
What types of water sources supply DuPage County? ▼
Water systems in DuPage County use SW (39 systems), GW (11 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 3.4% of DuPage County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.