PlainWater
Counties → Kansas

Johnson County, Kansas

Water Systems
9
Population Served
668,443
Total Violations
321
82 health-based
PFAS Detected
6
of 6 tested

Violation Analysis

100.0%
Systems with Violations
35.7
Avg Violations per System
25.5%
Health-Based Violations

Water Source Types

SW
7 systems (78%)
GW
2 systems (22%)

PFAS Contamination

6
Systems Tested
6
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

Johnson Kansas water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (9)

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
Water District 1 of Johnson Co 482,000 5 Detected
Olathe, City Of 143,014 58 Clean
Gardner, City Of 23,942 70 Detected
Johnson Co RWD 7 6,457 23 Detected
Spring Hill, City Of 5,694 20 Detected
Desoto, City Of 4,645 52 Detected
Edgerton, City Of 1,741 21 -
New Century Air Center 500 14 -
Clearview City, City Of 450 58 -

Other Counties in Kansas

Sedgwick County
29 systems · 498,426 served · 1,514 violations
Wyandotte County
2 systems · 160,765 served · 103 violations
Douglas County
14 systems · 155,316 served · 244 violations
Shawnee County
9 systems · 154,507 served · 551 violations
Leavenworth County
16 systems · 82,837 served · 1,071 violations
Riley County
13 systems · 62,651 served · 542 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Johnson County? ▼
Johnson County has 321 total drinking water violations across 9 water systems, of which 82 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Johnson County systems? ▼
Water systems in Johnson County serve approximately 668,443 people through 9 public water systems.
Has PFAS been detected in Johnson County water? ▼
Of 6 water systems tested for PFAS in Johnson County, 6 had PFAS detected (100.0% detection rate).
What types of water sources supply Johnson County? ▼
Water systems in Johnson County use SW (7 systems), GW (2 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. 25.5% of Johnson 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.