PlainWater
Counties → Missouri

Clay County, Missouri

Water Systems
21
Population Served
125,248
Total Violations
851
291 health-based
PFAS Detected
10
of 10 tested

Violation Analysis

100.0%
Systems with Violations
40.5
Avg Violations per System
34.2%
Health-Based Violations

Water Source Types

GW
11 systems (52%)
SW
10 systems (48%)

PFAS Contamination

10
Systems Tested
10
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

Clay Missouri water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (21)

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
Liberty PWS 30,800 115 Clean
Gladstone PWS 27,000 1 Clean
Kearney PWS 11,500 11 Detected
Excelsior Springs PWS 11,084 27 Clean
Smithville PWS 10,885 154 Detected
Ray County Cons PWSD 2 9,360 5 Clean
Clay County PWSD 6 4,912 11 Detected
North Kansas City PWS 4,500 7 Detected
Clay County PWSD 2 3,485 19 -
Clay County PWSD 3 3,447 40 Clean
Clay County PWSD 9 2,465 8 -
Clay County PWSD 8 2,243 14 Detected
Clay County PWSD 5 1,191 9 -
Clay County PWSD 4 1,032 15 -
Liberty Village MHP 350 21 -
Missouri City PWS 254 124 -
Clay County PWSD 7 245 39 -
Birmingham Village of PWS 200 33 -
Prathersville PWS 120 7 -
Mosby PWS 115 185 -
Twin Lakes MHP 60 6 -

Other Counties in Missouri

St. Louis County
23 systems · 1,145,619 served · 1,825 violations
Cass County
31 systems · 625,744 served · 1,771 violations
Jackson County
23 systems · 405,266 served · 559 violations
St. Charles County
54 systems · 310,776 served · 2,706 violations
St. Louis city County
1 systems · 304,709 served · 27 violations
Greene County
82 systems · 265,439 served · 7,132 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Clay County? ▼
Clay County has 851 total drinking water violations across 21 water systems, of which 291 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Clay County systems? ▼
Water systems in Clay County serve approximately 125,248 people through 21 public water systems.
Has PFAS been detected in Clay County water? ▼
Of 10 water systems tested for PFAS in Clay County, 10 had PFAS detected (100.0% detection rate).
What types of water sources supply Clay County? ▼
Water systems in Clay County use GW (11 systems), SW (10 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. 34.2% of Clay 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.