PlainWater
Counties → Missouri

Jefferson County, Missouri

Water Systems
99
Population Served
186,057
Total Violations
6,751
1,355 health-based
PFAS Detected
7
of 14 tested

Violation Analysis

99.0%
Systems with Violations
68.2
Avg Violations per System
20.1%
Health-Based Violations

Water Source Types

GW
37 systems (37%)
SW
13 systems (13%)

PFAS Contamination

14
Systems Tested
7
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

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

No violations on record (0) One or more violations (50)

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 Cons PWSD C 1 37,000 4 Clean
Jefferson County PWSD 1 21,113 2 Clean
Jefferson County PWSD 3 17,000 5 Clean
Jefferson County PWSD 2 16,548 78 Clean
Festus PWS 12,054 12 Detected
Jefferson County PWSD 10 10,000 8 Clean
Jefferson County PWSD 5 8,000 8 Clean
Jefferson County PWSD 6 7,500 20 Detected
Desoto PWS 6,400 32 Clean
Jefferson County PWSD 7 6,100 13 Clean
Pevely PWS 5,600 42 Clean
Crystal City PWS 4,733 31 Detected
Jefferson Co PWSD 8 4,733 4 Clean
Herculaneum PWS 4,227 13 Detected
Hillsboro PWS 3,000 75 -
Jefferson County PWSD 12 3,000 7 -
Raintree Plantation 2,200 58 -
Mirasol Subdivision 2,012 8 -
Jcpsd Summer Set 1,080 105 -
Grandview R 2 School 800 45 -
Villa Antonio Winery 800 14 -
Valle Lake Subd 625 31 -
Cedar Springs Elementary School 560 24 -
Maple Grove Elementary School 515 26 -
Sugar Creek Estates MHP 500 15 -
Servgas Fast Mart 500 29 -
Cedar Hill Estates Water 490 38 -
Lakewood Hills Subd 400 153 -
Sunrise Lakes Subd 400 110 -
Sunrise R IX Elementary School 400 69 -
Lake Adelle Subd 380 67 -
Quail Run of Imperial 370 166 -
Starling MHP 342 5 -
Jeffco MHP 310 6 -
Greenfield Manor MHP 307 9 -
Seven Spring Sewer & Water LLC 300 63 -
Camp Cedarledge 300 68 -
Oak Valley Golf Course Resort 275 103 -
Antire Valley Subd 260 99 -
Hunters Glen 240 25 -
Our Lady Queen of Peace 240 15 -
Lake Lorraine Water Co 230 34 -
Ozark Hills MHP 230 1 -
Briarwood Utilities 210 131 -
Sycamore Springs 200 23 -
Timber Creek Resort 200 21 -
Mackenzie Ridge LLC 180 93 -
High Ridge Manor Subd 175 58 -
Fairways Water and Sewer Assn 150 93 -
Lakeside Manor 150 20 -

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 Jefferson County? ▼
Jefferson County has 6,751 total drinking water violations across 99 water systems, of which 1,355 are health-based violations. 99.0% of systems have at least one violation.
How many people get water from Jefferson County systems? ▼
Water systems in Jefferson County serve approximately 186,057 people through 99 public water systems.
Has PFAS been detected in Jefferson County water? ▼
Of 14 water systems tested for PFAS in Jefferson County, 7 had PFAS detected (50.0% detection rate).
What types of water sources supply Jefferson County? ▼
Water systems in Jefferson County use GW (37 systems), SW (13 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. 20.1% 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.