PlainWater
Counties → Missouri

St. Charles County, Missouri

Water Systems
54
Population Served
310,776
Total Violations
2,706
649 health-based
PFAS Detected
5
of 5 tested

Violation Analysis

90.7%
Systems with Violations
50.1
Avg Violations per System
24.0%
Health-Based Violations

Water Source Types

GW
46 systems (85%)
SW
4 systems (7%)

PFAS Contamination

5
Systems Tested
5
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

St. Charles Missouri water systems by violation status, EPA SDWIS records.

No violations on record (4) One or more violations (46)

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
St Charles County PWSD 2 100,587 18 Detected
St Charles PWS 73,040 14 Clean
St Peters PWS 52,575 7 Detected
Wentzville PWS 41,784 30 Clean
Ofallon PWS 32,515 13 Detected
St Paul PWS 1,700 6 -
Orchard Farm Schools 1,600 7 -
St Charles Co PWSD 2 Augusta 881 8 -
St Charles PWSD 2 Foristell 550 21 -
MO American Jaxson 535 3 -
Ecm Water & Sewer Authority - Flint Hill 469 22 -
River Edge Gasmart 400 5 -
Memc LLC 350 38 -
Portage Des Sioux PWS 345 115 -
Indian Camp Creek Park 300 20 -
St Charles Community College Rwic 300 0 -
Gasmart Hyway 67 Mobil 300 10 -
Lake Center Marina 250 153 -
St Pauls Elementary School 200 18 -
Daniel Boone Home 162 10 -
National Cart Company 150 20 -
Prairie View Acres Subd 135 129 -
St Charles Co PWSD 2 - Sumac Ridge 103 9 -
Weldon Spring Heights Village PWS 100 70 -
Tara Oaks Manor Assn 100 104 -
Towne Park 100 56 -
Wildschuetz Brothers Farm 100 230 -
Montelle Winery 100 63 -
Big Country Acres Subdivision 90 55 -
Port Charles Harbor 75 4 -
Chandler Hill Vineyard 75 79 -
Polestar Marina 70 16 -
Confluence Rivers Stone Ridge Meadows 60 22 -
Country Estates 50 159 -
Boone Valley Golf Club 50 24 -
Broemmelsiek Park 50 20 -
Cherokee Lakes Camp 50 379 -
North Shore Marina 40 170 -
St Charles Co Police Training Facility 35 10 -
Sunflower Hill Farm 35 4 -
Rivers Project Office 30 65 -
Dog Prairie Tavern LLC 30 40 -
St Paul Knights of Columbus Hall 30 293 -
St Joseph Parish 25 7 -
Matson Hill Park Barn 25 0 -
Missouri Bluffs Park 25 0 -
Oglesby Park 25 0 -
Thies Farm 25 30 -
Balducci Vineyards 25 36 -
Noboleis Vineyards 25 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. Louis city County
1 systems · 304,709 served · 27 violations
Greene County
82 systems · 265,439 served · 7,132 violations
Boone County
13 systems · 228,201 served · 462 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in St. Charles County? ▼
St. Charles County has 2,706 total drinking water violations across 54 water systems, of which 649 are health-based violations. 90.7% of systems have at least one violation.
How many people get water from St. Charles County systems? ▼
Water systems in St. Charles County serve approximately 310,776 people through 54 public water systems.
Has PFAS been detected in St. Charles County water? ▼
Of 5 water systems tested for PFAS in St. Charles County, 5 had PFAS detected (100.0% detection rate).
What types of water sources supply St. Charles County? ▼
Water systems in St. Charles County use GW (46 systems), SW (4 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. 24.0% of St. Charles 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.