PlainWater
Counties → Kansas

Jefferson County, Kansas

Water Systems
18
Population Served
19,964
Total Violations
1,089
397 health-based
PFAS Detected
2
of 2 tested

Violation Analysis

100.0%
Systems with Violations
60.5
Avg Violations per System
36.5%
Health-Based Violations

Water Source Types

GW
15 systems (83%)
SW
3 systems (17%)

PFAS Contamination

2
Systems Tested
2
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

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

No violations on record (0) One or more violations (18)

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
Jefferson Co RWD 12 3,635 7 Clean
Jefferson Co RWD 3 2,435 77 -
Jefferson Co RWD 1 2,343 102 -
Jefferson Co RWD 13 2,115 24 -
Jefferson Co RWD 7 1,180 28 -
Valley Falls, City Of 1,086 156 -
Oskaloosa, City Of 1,086 70 -
McLouth, City Of 858 29 -
Perry, City Of 858 25 Clean
Jefferson Co RWD 2 642 72 -
Ozawkie, City Of 636 30 -
Nortonville, City Of 599 15 -
Jefferson Co RWD 15 563 264 -
Jefferson Co RWD 11 483 30 -
Winchester, City Of 450 23 -
Jefferson Co RWD 9 352 22 -
Lakeside Village Improvement Dist 343 70 -
Jefferson Co RWD 10 300 45 -

Other Counties in Kansas

Johnson County
9 systems · 668,443 served · 321 violations
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

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Jefferson County? ▼
Jefferson County has 1,089 total drinking water violations across 18 water systems, of which 397 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Jefferson County systems? ▼
Water systems in Jefferson County serve approximately 19,964 people through 18 public water systems.
Has PFAS been detected in Jefferson County water? ▼
Of 2 water systems tested for PFAS in Jefferson County, 2 had PFAS detected (100.0% detection rate).
What types of water sources supply Jefferson County? ▼
Water systems in Jefferson County use GW (15 systems), SW (3 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. 36.5% of Jefferson 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.