PlainWater
Counties → Illinois

DeKalb County, Illinois

Water Systems
57
Population Served
100,590
Total Violations
2,730
772 health-based
PFAS Detected
4
of 6 tested

Violation Analysis

84.2%
Systems with Violations
47.9
Avg Violations per System
28.3%
Health-Based Violations

Water Source Types

GW
50 systems (88%)

PFAS Contamination

6
Systems Tested
4
PFAS Detected
66.7%
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

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

No violations on record (8) One or more violations (42)

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
Dekalb 45,000 105 Clean
Sycamore 18,500 212 Clean
Sandwich 7,156 48 Clean
Northern Illinois University-Dekalb 6,500 36 Clean
Genoa 5,298 66 Detected
Cortland 4,270 199 Clean
Hinckley 2,006 255 -
Kirkland 2,000 26 -
Somonauk 1,786 8 -
Waterman 1,506 277 -
Kingston 1,160 75 -
Malta 1,143 44 -
Suburban Apartments (de Kalb Univ Dvl) 1,050 109 -
Shabbona 881 83 -
Cortland Corners MHP 250 507 -
Kishwaukee College 200 52 -
Buck Lake Estates Subdivision 150 12 -
Triangle Manufactured Home Community 124 0 -
Valley View Subdivision (Dekalb) 120 50 -
Sycamore Baseball Complex 100 5 -
Russells Forest Preserve - Nature Study 100 4 -
Jewel 3272 19236 100 0 -
Sycamore Park District - Soccer Fields 100 0 -
Sandwich Estates MHP 90 0 -
Sycamore RV Resort 75 8 -
Indian Oaks Country Club 75 12 -
Edgebrook Country Club 50 12 -
Bayer Co - Waterman Research Facility 50 172 -
Commonwealth Edison Company 35 37 -
Walcamp Lutheran Retreat-Bathhouse North 35 8 -
Donny Brook Estates Subdivision 30 147 -
Macqueen Forest Preserve-Lodge 25 7 -
Walcamp Lutheran Retreat-Bathhouse South 25 14 -
Walcamp Lutheran Retreat-Pavillion 25 15 -
Walcamp Lutheran Retreat-Kitchen 25 15 -
Sandwich Sportsmans Club 25 12 -
Wal-Mart Supercenter 0786 25 0 -
Schnucks 749 Dekalb 25 0 -
Jewel 3381 Sycamore 25 0 -
Franks Freshway Market - Genoa 25 0 -
Hyvee Sycamore 25 4 -
Sycamore Golf Clubhouse 25 5 -
Sycamore Park Wpa Shelter 25 5 -
Kingston Township Park West 25 20 -
North Grove School Association 25 6 -
Jonamac Orchard 25 6 -
Calvary Lutheran Church 25 5 -
Dekalb County Animal League 25 1 -
Evangelical Lutheran Church 25 8 -
Gum Farm Hunt Club 25 5 -

Other Counties in Illinois

Cook County
427 systems · 5,304,996 served · 21,728 violations
DuPage County
207 systems · 861,775 served · 15,779 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

Drinking Water Guides

Frequently Asked Questions

How many water violations are in DeKalb County? ▼
DeKalb County has 2,730 total drinking water violations across 57 water systems, of which 772 are health-based violations. 84.2% of systems have at least one violation.
How many people get water from DeKalb County systems? ▼
Water systems in DeKalb County serve approximately 100,590 people through 57 public water systems.
Has PFAS been detected in DeKalb County water? ▼
Of 6 water systems tested for PFAS in DeKalb County, 4 had PFAS detected (66.7% detection rate).
What types of water sources supply DeKalb County? ▼
Water systems in DeKalb County use GW (50 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. 28.3% of DeKalb 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.