No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting July 2025.
Serves about 3,000 people (1,000 connections) with groundwater bought from St Martin Industrial Park Water System.
From EPA's record for LA1099004. PurityMap is independent of St Martin Water District 4.
Are you this utility? Correct this listing →
8 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From July 2025 | Arsenic | 0.012 mg/L | 0.010 mg/L | Archived |
| From April 2025 | Arsenic | 0.011 mg/L | 0.010 mg/L | Archived |
| From January 2025 | Arsenic | 0.013 mg/L | 0.010 mg/L | Archived |
| From October 2024 | Arsenic | 0.012 mg/L | 0.010 mg/L | Archived |
| From April 2024 | Arsenic | 0.011 mg/L | 0.010 mg/L | Archived |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From July 2022 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From June 2020 | E. coli | – | – | Resolved |
| From September 2018 | E. coli | – | – | Resolved |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →St Martin Water District 4's phone number on EPA record is 337-394-6797. Its mailing address is St Martin water District 4 - Catahoula, 4360 Catahoula Hwy, ST. MARTINVILLE, LA 70582.
According to EPA's record, St Martin Water District 4 uses groundwater bought from St Martin Industrial Park Water System.
EPA's record shows 8 health-based violations for St Martin Water District 4 in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting July 2025. EPA also lists 2 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in St Martin Water District 4's latest lead and copper round, which ended in December 2023, was 1 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for St Martin Water District 4. Its phone number on EPA record is 337-394-6797. Its mailing address on EPA record is St Martin water District 4 - Catahoula, 4360 Catahoula Hwy, ST. MARTINVILLE, LA 70582. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.