PlainWater
Counties → Illinois

Clark County, Illinois

Water Systems
9
Population Served
15,476
Total Violations
552
73 health-based
PFAS Detected
0
of 3 tested

Violation Analysis

88.9%
Systems with Violations
61.3
Avg Violations per System
13.2%
Health-Based Violations

Water Source Types

GW
9 systems (100%)

PFAS Contamination

3
Systems Tested
0
PFAS Detected
0.0%
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

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

No violations on record (1) One or more violations (8)

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
Clark-Edgar RWD 5,801 6 Clean
Marshall 3,947 58 Clean
Casey 3,274 109 Clean
Martinsville 1,200 57 -
Westfield 678 273 -
Union-York Water District 501 44 -
Hydro Spray Car Wash 25 4 -
Walmart Marshall 25 1 -
Ice House Casey 25 0 -

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 Clark County? ▼
Clark County has 552 total drinking water violations across 9 water systems, of which 73 are health-based violations. 88.9% of systems have at least one violation.
How many people get water from Clark County systems? ▼
Water systems in Clark County serve approximately 15,476 people through 9 public water systems.
Has PFAS been detected in Clark County water? ▼
Of 3 water systems tested for PFAS in Clark County, 0 had PFAS detected (0.0% detection rate).
What types of water sources supply Clark County? ▼
Water systems in Clark County use GW (9 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. 13.2% of Clark 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.