PlainWater
Counties → Illinois

Jefferson County, Illinois

Water Systems
16
Population Served
34,083
Total Violations
279
12 health-based
PFAS Detected
3
of 3 tested

Violation Analysis

68.8%
Systems with Violations
17.4
Avg Violations per System
4.3%
Health-Based Violations

Water Source Types

SW
15 systems (94%)
GW
1 system (6%)

PFAS Contamination

3
Systems Tested
3
PFAS Detected
100.0%
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

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

No violations on record (5) One or more violations (11)

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
Mount Vernon 15,793 39 Detected
Northeast Mount Vernon Water Company 5,483 23 Detected
Woodlawn 3,587 31 Detected
Dix-Kell Water Commssion 1,972 22 -
Belle Rive 1,930 36 -
Waltonville 1,901 21 -
Bluford 1,880 58 -
Bonnie 437 22 -
Oak Grove Village 362 1 -
Rolling Meadows Mhc (Jefferson Co) 218 0 -
Moores Prairie Township Water Company 213 0 -
Nason 207 22 -
Wal-Mart Supercenter 0224 25 0 -
Icehouse South Mt Vernon 25 0 -
Icehouse Main Mt Vernon 25 0 -
Lucky Ice USA LLC - Mt Vernon 25 4 -

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 Jefferson County? ▼
Jefferson County has 279 total drinking water violations across 16 water systems, of which 12 are health-based violations. 68.8% of systems have at least one violation.
How many people get water from Jefferson County systems? ▼
Water systems in Jefferson County serve approximately 34,083 people through 16 public water systems.
Has PFAS been detected in Jefferson County water? ▼
Of 3 water systems tested for PFAS in Jefferson County, 3 had PFAS detected (100.0% detection rate).
What types of water sources supply Jefferson County? ▼
Water systems in Jefferson County use SW (15 systems), GW (1 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. 4.3% of Jefferson 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.