PlainWater
Counties → Illinois

Washington County, Illinois

Water Systems
13
Population Served
20,496
Total Violations
276
77 health-based
PFAS Detected
1
of 2 tested

Violation Analysis

100.0%
Systems with Violations
21.2
Avg Violations per System
27.9%
Health-Based Violations

Water Source Types

SW
12 systems (92%)
GW
1 system (8%)

PFAS Contamination

2
Systems Tested
1
PFAS Detected
50.0%
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

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

No violations on record (0) One or more violations (13)

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
Washington County Water Company 11,374 27 Detected
Nashville 3,230 24 Clean
Okawville 1,521 27 -
Irvington 1,081 15 -
Hoyleton Rwc 1,020 18 -
Hoyleton 658 9 -
Ashley 565 61 -
New Minden 343 3 -
Richview 251 18 -
Dubois 200 31 -
Radom 193 32 -
Hoyleton-New Minden 35 4 -
Lucky Ice Ashley 25 7 -

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 Washington County? ▼
Washington County has 276 total drinking water violations across 13 water systems, of which 77 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Washington County systems? ▼
Water systems in Washington County serve approximately 20,496 people through 13 public water systems.
Has PFAS been detected in Washington County water? ▼
Of 2 water systems tested for PFAS in Washington County, 1 had PFAS detected (50.0% detection rate).
What types of water sources supply Washington County? ▼
Water systems in Washington County use SW (12 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. 27.9% of Washington 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.