Community Water System · PWS LA1099004
St Martin Water District 4 - Catahoula
Operator location St. Martinville, Louisiana - 55% of 208 violations are health-based (upper-third health share (> 23%)); groundwater source; 3,000 served per SDWIS.
- 3,000
- People served (this PWS)
- 208
- EPA violations (this PWS)
- 114
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
St Martin Water District 4 - Catahoula standing, high SDWIS violation third
55% of 208 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 55% is upper-third health share (> 23%). Population rank #10,614 of 29,740 among systems serving 500+.
The verdict
St Martin Water District 4 - Catahoula sits in the upper third of the sitemap cohort by violation count (208), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 3,000 (mid served population (≤ 3,309)). Health-based share is 55% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #10,614 of 29,740
- Population · /systems
- #278 of 707
- Population · LA
- 208
- Total EPA violations on record
- 55%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,000
- County
- St. Martin Parish
- School/Daycare
- No
- MCL Violations
- 106
- Monitoring Violations
- 45
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 58 | 2025 |
| Coliform (TCR) | MCL | 44 | 2012 |
| Public Notice | Other | 32 | 2014 |
| TTHM | MR | 22 | 2013 |
| Total Haloacetic Acids (HAA5) | MR | 22 | 2013 |
| Consumer Confidence Rule | Other | 8 | 2017 |
| Groundwater Rule | TT | 4 | 2011 |
| Revised Total Coliform Rule | TT | 4 | 2018 |
| Revised Total Coliform Rule | MCL | 4 | 2020 |
| Lead and Copper Rule | MR | 1 | 2021 |
Violation Count vs. the National Corpus
St Martin Water District 4 - Catahoula has 208 recorded EPA violations, 86% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 14% carry more. 55% of this system's own violations are health-based (114 of 208), and it ranks #10,614 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
208 Higher than most more violations than 86% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on St Martin Water District 4 - Catahoula
114 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for LA1099004.
Sources: EPA SDWIS
Nationwide peers
208 violations · 3,000 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with St Martin Water District 4 - Catahoula
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Louisiana compares on the same EPA violation measures. Louisiana systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.