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City of Westlake Water System

What EPA’s and CDC’s records show in this utility’s water: PFAS and lithium; nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
4,858 people
Connections
2,029
Water source
Groundwater
Based in
Westlake, LA
County
Calcasieu Parish
Owner
Local government
The ZIP code it serves

70669

The short answer

1 result is above the health goal, and 1 more is above EPA’s health benchmark. The worst: Lithium, above EPA’s health benchmark. 4 health-based violations since 2016.

What handles it

What was found

PFAS and lithium: EPA UCMR 5, samples taken from April 10, 2024 to Oct. 7, 2025.

Lead and copper: EPA SDWIS monitoring periods ending 2004 to 2024.

Total trihalomethanes (TTHM), haloacetic acids (HAA5) and nitrate: Louisiana’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2020 to 2022, with EPA’s 2012 to 2019 file for earlier years.

Fluoride, arsenic, chromium (total) and uranium: EPA’s compliance monitoring file, samples taken from June 2, 2014 to Dec. 11, 2019. Newer results are in the utility’s annual water quality report.

PFAS: None of the six PFAS in EPA’s 2024 drinking water rule was found in this utility’s samples. None of the other 23 PFAS tested for was found either.

EPA’s 2024 PFAS rule, compound by compound

PFASEPA’s limitResult
PFOA4.0 pptNot foundNot found in any of 6 samples, below 4 ppt
PFOS4.0 pptNot foundNot found in any of 6 samples, below 4 ppt
PFHxS10 pptNot foundNot found in any of 6 samples, below 3 ppt
PFNA10 pptNot foundNot found in any of 6 samples, below 4 ppt
HFPO-DA (GenX)10 pptNot foundNot found in any of 6 samples, below 5 ppt
PFBSIndex onlyNot foundNot found in any of 6 samples, below 3 ppt
Hazard IndexPFHxS, PFNA, HFPO-DA and PFBS together1Doesn’t applyDoesn’t apply: no sampling location found two or more of the four
Results from EPA’s UCMR 5 sampling. “Below” is the lab’s reporting level: a result under it reads as not found, which is not the same as zero. The limits are EPA’s 2024 rule, with compliance due from 2029; EPA has since proposed changes to some of them, explained on each compound’s page. PFBS has no limit of its own and counts only toward the Hazard Index, which adds up the four, each against EPA’s health-based level, from each sampling location’s average, as EPA’s UCMR 5 summary does. It counts only where two or more of the four were found, and is above the limit from 1.5.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

1.0ppb

90th percentile, 2022 to 2024

In the latest period, 9 in 10 homes sampled were at or below 1.0 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Above EPA’s health benchmark1

Lithium

Comes from the source

Above EPA’s health benchmark

18.9ppb

Highest sample, April 10, 2024; found in 6 of 6

The highest sample was 18.9 ppb, about twice EPA’s health reference level of 10 ppb. That is a screening level, not an enforceable limit.

What handles it

No certification claim covers this compound yet.

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

15.2ppb

Highest yearly average, 2020 to 2022

2022 average: 9.3 ppb

Averaged by year, the highest was 15.2 ppb, in 2021, below EPA’s legal limit of 80 ppb. In 2022, the latest year on file, it averaged 9.3 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 16.3 ppb, in 2019.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

6.3ppb

Highest yearly average, 2020 to 2022

2022 average: 2.9 ppb

Averaged by year, the highest was 6.3 ppb, in 2020, below EPA’s legal limit of 60 ppb. In 2022, the latest year on file, it averaged 2.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 5.3 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.2ppm

Highest yearly average, 2014 to 2019

2019 average: 0.2 ppm

Averaged by year, the highest was 0.2 ppm, in 2018, below EPA’s legal limit of 4.0 ppm. In 2019, the latest year on file, its six samples averaged 0.2 ppm.

What handles it

Utilities above EPA’s PFAS limits, state by state
33 compounds tested and not foundIncluding all six PFAS in EPA’s 2024 rule. Below the reporting level in every sample. Not found is not the same as zero.

From routine monitoring

  • Arsenic
  • Chromium (total)
  • Nitrate
  • Uranium

PFAS and lithium, from EPA’s UCMR 5 sampling

  • 11Cl-PF3OUdS
  • 4:2 FTS
  • 6:2 FTS
  • 8:2 FTS
  • 9Cl-PF3ONS
  • ADONA
  • HFPO-DA (GenX)
  • NEtFOSAA
  • NFDHA
  • NMeFOSAA
  • PFBA
  • PFBS
  • PFDA
  • PFDoA
  • PFEESA
  • PFHpA
  • PFHpS
  • PFHxA
  • PFHxS
  • PFMBA
  • PFMPA
  • PFNA
  • PFOA
  • PFOS
  • PFPeA
  • PFPeS
  • PFTA
  • PFTrDA
  • PFUnA

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

Disinfectant

City of Westlake Water System reported disinfecting with chlorine, not chloramine, at all 3 of its sampling points, in its 2024 to 2025 sampling for EPA. It also reported permanganate.

Chlorine leaves water that sits out for a few days, CDC says. A filter certified for it carries a chlorine claim under NSF/ANSI 42; a shower filter, a free chlorine claim under NSF/ANSI 177. This is what the utility reported for that sampling. Its annual water quality report says what it uses now.

Chlorine vs. chloramineShower filters, by what their listings cover

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyDec. 5, 2023—Resolved
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyDec. 5, 2023—Resolved
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyDec. 5, 2023—Unaddressed
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyDec. 5, 2023—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 3 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5) and nitrate results here are Louisiana’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride, arsenic, chromium (total) and uranium come from EPA’s file alone, which ends in 2019. City of Westlake Water System’s own annual report, which it must send you every year, has newer results for those and the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 samples are from April 10, 2024 to Oct. 7, 2025; CDC’s yearly averages for Louisiana cover 2020 to 2022; EPA’s compliance samples are from June 2, 2014 to Dec. 11, 2019.

Testing your own tap

City of Westlake Water System’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Louisiana certifies.

The 3 labs Louisiana certifies closest to the area City of Westlake Water System serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • LDH Lake Charles Regional Laboratory

    Lake Charles, LA · about 4 miles

    Certified for bacteria

    (337) 475-3236

  • JRTC & Fort Johnson Environmental Laboratory

    Fort Polk, LA · about 56 miles

    Certified for bacteria

    (337) 531-9128

  • SGS North America, Inc. - Scott

    Scott, LA · about 69 miles

    Certified for nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts

All 48 certified labs for Louisiana

Sources

PWSID LA1019054. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Calcasieu Parish

All Louisiana utilities

What to do next