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Counties → Louisiana

St. Tammany Parish County, Louisiana

Water Systems
213
Population Served
266,825
Total Violations
7,149
1,932 health-based
PFAS Detected
16
of 19 tested

Violation Analysis

78.9%
Systems with Violations
33.6
Avg Violations per System
27.0%
Health-Based Violations

Water Source Types

GW
50 systems (23%)

PFAS Contamination

19
Systems Tested
16
PFAS Detected
84.2%
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. Tammany Parish Louisiana water systems by violation status, EPA SDWIS records.

No violations on record (1) One or more violations (49)

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
Slidell Water Supply 35,547 98 Clean
St Tam Parish- Bedico -Faubourg-Coquille 18,372 9 Clean
St Tam Parish - Briarwood Terrace 17,536 48 Clean
Covington Water Supply 16,185 76 Clean
Mandeville Water Supply 13,000 23 Clean
Utilities Inc - North Park Water Supply 11,298 27 Clean
Bayou Liberty Water Association 10,791 65 Clean
Magnolia-Eden Isles 10,155 28 Clean
Magnolia-Greenleaves 8,031 47 Clean
St Tam Parish - Cross Gates SD 7,791 49 Detected
Magnolia-Resolve Whisperwood 6,867 13 Clean
Utilities Inc - Kingspoint Subdivision 6,351 13 Clean
Lee Road Water Corporation 6,048 25 Clean
St. Tammany Water District #2 5,200 36 Clean
Magnolia-The Meadows 4,701 21 Clean
Beau Chene Water System 4,650 12 Clean
Magnolia-Lakeshore Estates 4,146 36 -
Abita Springs Water System 3,693 47 Clean
Town of Pearl River 3,333 22 Clean
St Tammany Water District 3 2,920 106 -
Magnolia-Guste Island 2,847 9 -
Utilities Inc - Lake Village SD 2,724 4 -
St Tam Parish Pineland Park Subd 2,500 15 -
Utilities Inc - Green Brier Water Supply 2,250 36 -
Utilities Inc - Huntwyck Village 2,088 13 -
Pelican Park 2,000 28 -
Folsom Water Supply 1,992 32 Clean
St Tam Parish -Northridge Estates 1,653 3 -
Utilities Inc - Magnolia Forest Subd 1,635 11 -
Utilities Inc - Woodridge Subdivision 1,590 6 -
Utilities Inc - Quail Ridge Subdivision 1,563 13 -
Magnolia-Monterey Subdivision 1,356 39 -
Tchefuncta Club Estates 1,245 38 -
Magnolia-Penn Mill Lakes 1,152 17 -
St Tam Parish - Medcath (la Heart) 1,001 6 -
Fontainebleau State Park 1,000 65 -
Knights of Columbus Bingo 1,000 4 -
Winn Dixie #1500 1,000 11 -
Lacombe Stores 999 3 -
St Tam Parish - River Oaks 930 1 -
Arby's 900 20 -
Villages of Bocage- Madisonville 894 18 -
Mayfield Elementary School 890 7 -
Madisonville Water Supply 871 8 -
Lake Ramsey 840 125 -
Magnolia-Money Hills Estates 825 18 -
Magnolia-River Park 822 0 -
Sunny Times 4 LLC 750 7 -
Lakeshore High School 750 4 -
Sun Water Supply 726 129 -

Other Counties in Louisiana

East Baton Rouge Parish County
19 systems · 650,087 served · 566 violations
Jefferson Parish County
4 systems · 440,987 served · 247 violations
Orleans Parish County
10 systems · 389,093 served · 157 violations
Lafayette Parish County
62 systems · 303,179 served · 2,569 violations
Caddo Parish County
48 systems · 249,641 served · 5,038 violations
Calcasieu Parish County
80 systems · 216,042 served · 3,535 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in St. Tammany Parish County? ▼
St. Tammany Parish County has 7,149 total drinking water violations across 213 water systems, of which 1,932 are health-based violations. 78.9% of systems have at least one violation.
How many people get water from St. Tammany Parish County systems? ▼
Water systems in St. Tammany Parish County serve approximately 266,825 people through 213 public water systems.
Has PFAS been detected in St. Tammany Parish County water? ▼
Of 19 water systems tested for PFAS in St. Tammany Parish County, 16 had PFAS detected (84.2% detection rate).
What types of water sources supply St. Tammany Parish County? ▼
Water systems in St. Tammany Parish County use GW (50 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. 27.0% of St. Tammany Parish 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.