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Counties → Louisiana

St. Mary Parish County, Louisiana

Water Systems
16
Population Served
63,659
Total Violations
1,325
760 health-based
PFAS Detected
7
of 7 tested

Violation Analysis

100.0%
Systems with Violations
82.8
Avg Violations per System
57.4%
Health-Based Violations

Water Source Types

SW
9 systems (56%)
GW
7 systems (44%)

PFAS Contamination

7
Systems Tested
7
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. Mary Parish Louisiana water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (16)

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
Morgan City Water System 12,703 52 Clean
Water & Sewer Commission 4 of St Mary 9,709 53 Detected
Patterson Water System 8,456 55 Detected
Franklin Water Supply 8,325 558 Detected
St Mary Water & Sewer Comm #3 7,500 37 Detected
Town of Berwick 5,898 14 Detected
St Mary Parish W&S #2 Bayou Vista 5,379 2 Detected
St Mary Parish Water Sewerage Comm 1 2,823 47 -
St Mary Par Jt Water Sewer Commission 5 1,240 40 -
Cypremort Point State Park 500 20 -
Port of West St Mary 400 183 -
Quintana Marina 280 28 -
Glencoe Community Water System 190 140 -
Compass Minerals La 156 12 -
Bayview Development 100 28 -
Berwick Bayou Vista Ww Commission 0 56 -

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
St. Tammany Parish County
213 systems · 266,825 served · 7,149 violations
Caddo Parish County
48 systems · 249,641 served · 5,038 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in St. Mary Parish County? ▼
St. Mary Parish County has 1,325 total drinking water violations across 16 water systems, of which 760 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from St. Mary Parish County systems? ▼
Water systems in St. Mary Parish County serve approximately 63,659 people through 16 public water systems.
Has PFAS been detected in St. Mary Parish County water? ▼
Of 7 water systems tested for PFAS in St. Mary Parish County, 7 had PFAS detected (100.0% detection rate).
What types of water sources supply St. Mary Parish County? ▼
Water systems in St. Mary Parish County use SW (9 systems), GW (7 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. 57.4% of St. Mary 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.