Public Water System

ST MARTIN WATER DISTRICT 4 - CATAHOULA

PWSID LA1099004 · Louisiana · 3,000 people served

Failing

ST MARTIN WATER DISTRICT 4 - CATAHOULA is an EPA-regulated public water system in Louisiana (PWSID LA1099004). It serves an estimated 3,000 residents — a small town of customers — across 1 community across 1 ZIP code.

Over the past five years, ST MARTIN WATER DISTRICT 4 - CATAHOULA has recorded 28 EPA health-based violations. The grade of F summarizes this compliance pattern. Specific contaminants, dates, and rule citations are listed in the violation history below.

Service Area

Loading map...

Centered on the averaged ZIP-code centroid of 1 ZIP served.

Population

3,000

Cities

ZIPs

Violations

EPA Health-Based Violations

Health-based Maximum Contaminant Level (MCL) violations on file for ST MARTIN WATER DISTRICT 4 - CATAHOULA over the past five years of EPA SDWIS reporting.

Arsenicchemical

EPA Code 1005 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.01 mg/L

Last Reading

.012 MG/L

First Reported

Jul 2022

Most Recent

Jul 2025

What this violation means

Arsenic is a known human carcinogen that occurs naturally in groundwater across many parts of the United States, especially the Southwest and parts of New England. Long-term exposure even at low levels has been linked to bladder, lung, and skin cancer, as well as cardiovascular disease and developmental effects in children.

Recommended precautions

→Reverse osmosis filtration removes arsenic effectively.
→Distillation also removes arsenic — point-of-use distillers work for drinking and cooking water.
→Boiling does NOT remove arsenic. It actually concentrates it as water evaporates.
→If your well water has arsenic, test annually and treat at the point of entry.

Read the complete guide to Arsenic

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Cities Served by ST MARTIN WATER DISTRICT 4 - CATAHOULA

ST. MARTINVILLE

ZIP Codes Served

70582

About this system

EPA records this system as PWSID LA1099004. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact ST MARTIN WATER DISTRICT 4 - CATAHOULA directly or review their annual Consumer Confidence Report (CCR).