D26/100
St. Martinville Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 13,824 residents · Louisiana
What's In St. Martinville's Tap Water?
31
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
4
Violations (last 5yr)
3
Unresolved
4
Health-Related
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – December 20, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Unresolved
Violation related to Consumer Confidence Report
When: November 27, 2023Rule: Consumer Confidence RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Violation related to Consumer Confidence Report
When: November 27, 2023Rule: Consumer Confidence RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Violation related to Consumer Confidence Report
When: February 24, 2023Rule: Consumer Confidence RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
ST MARTIN WATER DISTRICT 4 - CATAHOULA
Population Served
3,000
Water Source
Purchased Groundwater
System ID
LA1099004
CITY OF ST MARTINVILLE WATER SYSTEM
Population Served
7,575
Water Source
Groundwater
System ID
LA1099007
ST MARTIN WATER WORKS DISTRICT 3 - CADE
Population Served
3,249
Water Source
Groundwater
System ID
LA1099028
Frequently Asked Questions About St. Martinville Water
Is St. Martinville tap water safe to drink?
St. Martinville, Louisiana tap water receives a grade of D (26/100), which is considered poor. 1 contaminant(s) exceed EPA maximum contaminant levels and 84 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in St. Martinville's water?
Of the 32 contaminants tested in St. Martinville's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does St. Martinville have any water quality violations?
Yes, St. Martinville has 84 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, TT, Other. 42 of these are health-based violations, which are the most serious category.
Do I need a water filter in St. Martinville?
Based on EPA data, using a water filter in St. Martinville is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does St. Martinville's tap water come from?
St. Martinville's drinking water is sourced from purchased groundwater and supplied by ST MARTIN WATER DISTRICT 4 - CATAHOULA and 2 other water system(s). The system serves approximately 13,824 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is St. Martinville's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. St. Martinville's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does St. Martinville's water compare to other cities in Louisiana?
St. Martinville's water quality score of 26/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Louisiana state page to see how all cities in the state compare.
What should I do if I'm concerned about St. Martinville's water quality?
If you have concerns about St. Martinville's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (ST MARTIN WATER DISTRICT 4 - CATAHOULA) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.