F0/100
Grand Coteau Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,650 residents · Louisiana
What's In Grand Coteau's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.00 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.007 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
17
Violations (last 5yr)
6
Unresolved
10
Health-Related
TIER 2Resolved
Violation related to Consumer Confidence Report
When: March 3, 2025Rule: Consumer Confidence RuleEnforcement: Formal — state order issued
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2025 – May 6, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 2Unresolved
Treatment technique violation
TIER 3Resolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: September 4, 2024 – February 4, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – March 1, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: August 17, 2022 – December 19, 2024Rule: Ground Water RuleEnforcement: Formal — state order issued
TIER 2Resolved
Violation related to Consumer Confidence Report
When: July 12, 2022 – March 27, 2025Rule: Consumer Confidence RuleEnforcement: Formal — state order issued
TIER 2Resolved
Violation related to Consumer Confidence Report
When: July 12, 2022Rule: Consumer Confidence RuleEnforcement: Formal — state order issued
TIER 2Unresolved
Violation related to Consumer Confidence Report
When: July 12, 2022Rule: Consumer Confidence RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Violation related to Consumer Confidence Report
When: July 12, 2022Rule: Consumer Confidence RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Resolved
Violation related to Consumer Confidence Report
When: July 12, 2022Rule: Consumer Confidence RuleEnforcement: Formal — state order issued
TIER 2Unresolved
Violation related to Consumer Confidence Report
When: July 12, 2022Rule: Consumer Confidence RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Resolved
Violation related to Consumer Confidence Report
When: July 12, 2022Rule: Consumer Confidence RuleEnforcement: Formal — state order issued
TIER 2Unresolved
Violation related to Consumer Confidence Report
When: July 12, 2022Rule: Consumer Confidence RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2021 – November 24, 2021Enforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 17, 2021 – May 21, 2021Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
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
TOWN OF GRAND COTEAU WATER SYSTEM
Population Served
1,650
Water Source
Groundwater
System ID
LA1097001
Frequently Asked Questions About Grand Coteau Water
Is Grand Coteau tap water safe to drink?
Grand Coteau, Louisiana tap water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA maximum contaminant levels and 47 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Grand Coteau's water?
Of the 2 contaminants tested in Grand Coteau'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 Grand Coteau have any water quality violations?
Yes, Grand Coteau has 47 EPA violation(s) on record, with the most recent in 2025. Violation types include TT, MR, RPT. 21 of these are health-based violations, which are the most serious category.
Do I need a water filter in Grand Coteau?
Based on EPA data, using a water filter in Grand Coteau 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 Grand Coteau's tap water come from?
Grand Coteau's drinking water is sourced from groundwater and supplied by TOWN OF GRAND COTEAU WATER SYSTEM. The system serves approximately 1,650 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Grand Coteau'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. Grand Coteau'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 Grand Coteau's water compare to other cities in Louisiana?
Grand Coteau's water quality score of 0/100 earns a grade of F, which is considered failing. 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 Grand Coteau's water quality?
If you have concerns about Grand Coteau'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 (TOWN OF GRAND COTEAU WATER SYSTEM) 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.