C48/100
Westlake Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 10,198 residents · Louisiana
What's In Westlake'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)
2
Unresolved
2
Health-Related
TIER 2Unresolved
Treatment technique violation
TIER 3Unresolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: August 11, 2023 – December 6, 2023Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Violation related to Consumer Confidence Report
When: July 3, 2023 – December 6, 2023Rule: Consumer Confidence 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
CALCASIEU PARISH WW DISTRICT NO 4
Population Served
5,340
Water Source
Groundwater
System ID
LA1019053
WESTLAKE CITY OF WATER SYSTEM
Population Served
4,858
Water Source
Groundwater
System ID
LA1019054
Frequently Asked Questions About Westlake Water
Is Westlake tap water safe to drink?
Westlake, Louisiana tap water receives a grade of C (48/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 30 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Westlake's water?
Of the 31 contaminants tested in Westlake's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Westlake have any water quality violations?
Yes, Westlake has 30 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, TT, RPT. 17 of these are health-based violations, which are the most serious category.
Do I need a water filter in Westlake?
Westlake water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Westlake's tap water come from?
Westlake's drinking water is sourced from groundwater and supplied by CALCASIEU PARISH WW DISTRICT NO 4 and 1 other water system(s). The system serves approximately 10,198 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Westlake'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. Westlake'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 Westlake's water compare to other cities in Louisiana?
Westlake's water quality score of 48/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Louisiana state page to see how all cities in the state compare.
What should I do if I'm concerned about Westlake's water quality?
If you have concerns about Westlake'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 (CALCASIEU PARISH WW DISTRICT NO 4) 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.