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Counties → Illinois

Williamson County, Illinois

Water Systems
26
Population Served
75,426
Total Violations
1,069
186 health-based
PFAS Detected
5
of 7 tested

Violation Analysis

96.2%
Systems with Violations
41.1
Avg Violations per System
17.4%
Health-Based Violations

Water Source Types

SW
25 systems (96%)
GW
1 system (4%)

PFAS Contamination

7
Systems Tested
5
PFAS Detected
71.4%
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

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

No violations on record (1) One or more violations (25)

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
Marion 16,855 136 Detected
Herrin 12,747 19 Detected
Lake of Egypt Pwd 11,368 172 Clean
Carterville 6,484 29 Detected
Coal Valley Pwd 3,960 23 Clean
Corinth Pwd 3,927 16 Detected
Johnston City 3,509 20 Detected
Pittsburg 2,948 45 -
Cambria 1,727 18 -
Crainville 1,711 57 -
Fci-Marion 1,544 57 -
Devils Kitchen Water District 1,428 52 -
Ferges Water District 1,185 15 -
Highway 37 North Pwd 1,065 34 -
Energy 984 5 -
Blairsville Pwd 807 31 -
Hurst 782 68 -
Creal Springs 683 26 -
Colp 506 54 -
Freeman Spur 373 39 -
Bush 285 35 -
The Orchards Mhc 253 10 -
Marion Mobile Home Village 220 0 -
Crab Orchard Refuge 25 99 -
Walmart Supercenter #0216 25 4 -
Lj Ice Company 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 Williamson County? ▼
Williamson County has 1,069 total drinking water violations across 26 water systems, of which 186 are health-based violations. 96.2% of systems have at least one violation.
How many people get water from Williamson County systems? ▼
Water systems in Williamson County serve approximately 75,426 people through 26 public water systems.
Has PFAS been detected in Williamson County water? ▼
Of 7 water systems tested for PFAS in Williamson County, 5 had PFAS detected (71.4% detection rate).
What types of water sources supply Williamson County? ▼
Water systems in Williamson County use SW (25 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. 17.4% of Williamson 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.