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Community Water System · PWS LA1099004

St Martin Water District 4 - Catahoula

St. Martinville, Louisiana 70582 - drinking water served from groundwater sources to 3,000 people, tracked in EPA SDWIS and UCMR5.

3,000
People served
208
EPA violations
114
Health-based
Untested
UCMR5 result

The verdict

EPA records 208 drinking-water violations at St Martin Water District 4 - Catahoula, 55% of them health-based - above the Louisiana per-system average.

208
Total EPA violations on record
55%
Health-based (MCL / treatment failure)
3,000
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St Martin Water District 4 - Catahoula

St Martin Water District 4 - Catahoula is a local-owned community water system that delivers drinking water to 3,000 residents in St. Martinville, Louisiana (St. Martin Parish County) through 1,000 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 208 total violations for this system , of which 114 (55%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 45 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Arsenic, recorded in 58 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Louisiana, EPA tracks 1,234 public water systems serving 5,316,532 people, with 115,060 cumulative violations and 62,164 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 93.2 violations. Statewide, 218 of 265 UCMR5-tested systems have reported PFAS detections (82.3%).

St Martin Water District 4 - Catahoula's 208 violations sit above the Louisiana average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
3,000
Total Violations
208
Health-Based Violations
114
Water Source
Groundwater

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

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for St Martin Water District 4 - Catahoula.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID LA1099004 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Louisiana Drinking Water Authority

Louisiana's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find LA regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Arsenic MCL 58 SDWIS / LA1099004 / 1005
2021 Lead and Copper Rule MR 1 SDWIS / LA1099004 / 5000
2020 Revised Total Coliform Rule MCL 4 SDWIS / LA1099004 / 8000
2018 Revised Total Coliform Rule TT 4 SDWIS / LA1099004 / 8000
2017 Consumer Confidence Rule Other 8 SDWIS / LA1099004 / 7000
2014 Public Notice Other 32 SDWIS / LA1099004 / 7500
2013 TTHM MR 22 SDWIS / LA1099004 / 2950
2013 Total Haloacetic Acids (HAA5) MR 22 SDWIS / LA1099004 / 2456
2012 Coliform (TCR) MCL 44 SDWIS / LA1099004 / 3100
2011 Groundwater Rule TT 4 SDWIS / LA1099004 / 0700

How St Martin Water District 4 - Catahoula Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric St Martin Water District 4 - Catahoula Louisiana avg Federal benchmark
Total violations 208 93.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 114 50.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 82.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,000 4,308 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,234 regulated public water systems in Louisiana.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is St Martin Water District 4 - Catahoula water safe to drink? ▼
St Martin Water District 4 - Catahoula (PWS ID: LA1099004) has 208 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,000 people using Groundwater sources.
How many people does St Martin Water District 4 - Catahoula serve? ▼
St Martin Water District 4 - Catahoula serves 3,000 people in St. Martinville, Louisiana. It is a Local-owned system using Groundwater water sources with 1,000 service connections.
What type of violations does St Martin Water District 4 - Catahoula have? ▼
St Martin Water District 4 - Catahoula has 208 total violations: 114 health-based violations (MCL exceedances or treatment failures), 45 monitoring/reporting violations, and 8 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St Martin Water District 4 - Catahoula water? ▼
No PFAS testing data is available for St Martin Water District 4 - Catahoula under the EPA's UCMR5 monitoring program.
What water source does St Martin Water District 4 - Catahoula use? ▼
St Martin Water District 4 - Catahoula uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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 system's figures are rendered directly from 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.