Westlake City of Water System

Published drinking-water records and contacts for Westlake City of Water System. System LA1019054. Review sources and dates; not a real-time water assessment.

System ID: LA1019054
State or territory: LA
Published population served: 4858
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 180 — 2024-04-10 – 2025-10-07
Lead and copper monitoring summaries: 11 — 1992-07-01 – 2024-12-31

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Published testing results

Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.

“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example

EPA UCMR 5 — most recent imported sample per substance
Substance	Published result	Reporting limit	Sample date	Sampling location
11Cl-PF3OUdS	< 0.005 µg/L	0.005 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
ADONA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
NFDHA	< 0.02 µg/L	0.02 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFBA	< 0.005 µg/L	0.005 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFBS	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFDA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFDoA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFEESA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFHpA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFHpS	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFHxA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFHxS	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFMBA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFMPA	< 0.004 µg/L	0.004 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFNA	< 0.004 µg/L	0.004 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFOA	< 0.004 µg/L	0.004 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFOS	< 0.004 µg/L	0.004 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFPeA	< 0.003 µg/L	0.003 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFPeS	< 0.004 µg/L	0.004 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFTA	< 0.008 µg/L	0.008 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFTrDA	< 0.007 µg/L	0.007 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
PFUnA	< 0.002 µg/L	0.002 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA
lithium	16.0 µg/L	9 µg/L	2025-10-07	WESTLAKE CITY OF WATER SYSTEM / 5PBA

Download all EPA UCMR 5 records (CSV)

Lead and copper: 90th-percentile summaries

These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile

Eight most recent imported monitoring summaries
Substance	Published 90th percentile	Monitoring period	Source quarter
Lead (PB90)	0.001 mg/L	2022-01-01 – 2024-12-31	2026Q3
Lead (PB90)	0 mg/L	2021-01-01 – 2021-12-31	2026Q3
Lead (PB90)	0.001 mg/L	2015-01-01 – 2017-12-31	2026Q3
Lead (PB90)	0 mg/L	2012-01-01 – 2014-12-31	2026Q3
Lead (PB90)	0.001 mg/L	2009-01-01 – 2011-12-31	2026Q3
Lead (PB90)	0.002 mg/L	2008-01-01 – 2010-12-31	2026Q3
Lead (PB90)	0.0046 mg/L	2005-01-01 – 2007-12-31	2026Q3
Lead (PB90)	0.002 mg/L	2002-01-01 – 2004-12-31	2026Q3

Published compliance history

12 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / record	Period	Recorded status	Health-based (EPA classification)	Source quarter
Lead and Copper Rule / Lead Consumer Notice	2024-12-18 – —	Unaddressed	No	2026Q3
Ground Water Rule / Failure To Address Deficiency	2023-12-05 – —	Resolved	Yes	2026Q3
Ground Water Rule / Failure To Address Deficiency	2023-12-05 – —	Resolved	Yes	2026Q3
Ground Water Rule / Failure To Address Deficiency	2023-12-05 – —	Unaddressed	Yes	2026Q3
Ground Water Rule / Failure To Address Deficiency	2023-12-05 – —	Resolved	Yes	2026Q3
Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report	2022-07-01 – —	Resolved	No	2026Q3
Consumer Confidence Rule / Consumer Confidence Report Inadequate Reporting	2017-10-01 – —	Resolved	No	2026Q3
Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR)	2007-11-01 – 2007-11-30	Archived	Yes	2026Q3
Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR)	2007-10-01 – 2007-10-31	Archived	Yes	2026Q3
Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR)	2007-09-01 – 2007-09-30	Archived	Yes	2026Q3
Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR)	2001-06-15 – 2001-07-14	Archived	Yes	2026Q3
Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR)	1995-07-15 – 1995-08-15	Archived	Yes	2026Q3

Source dates and refresh checks

A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.

EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17

Administrative contact (EPA filing)

Mcmillin, Hal: 337-433-0691

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records