Skip to content
TapBuff
ZIP

Town of Gueydan Water System

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

Serves
2,016 people
Connections
672
Water source
Groundwater
Based in
Gueydan, LA
County
Vermilion Parish
Owner
Local government
The ZIP code it serves

70542

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Copper, above the action level. 8 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2004 to 2022.

Haloacetic acids (HAA5), total trihalomethanes (TTHM), arsenic, nitrate and uranium: 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.

Chromium (total) and fluoride: EPA’s compliance monitoring file, samples taken from April 14, 2014 to April 24, 2017. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Copper

Comes from pipes, often your own

Above the action level

1.5ppm

90th percentile, 2022

In the latest period, 9 in 10 homes sampled were at or below 1.5 ppm, above EPA’s action level of 1.3 ppm.

What handles it

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

4.0ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 4.0 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

Below EPA’s limits4

Chromium (total)

Comes from the source

Below EPA’s limits

10ppb

Highest yearly average, 2014 to 2017

Averaged by year, the highest was 10 ppb, in 2017, below EPA’s legal limit of 100 ppb. That was also the latest year on file.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

5.0ppb

Highest yearly average, 2020 to 2022

2022 average: 2.8 ppb

Averaged by year, the highest was 5.0 ppb, in 2021, below EPA’s legal limit of 60 ppb. In 2022, the latest year on file, it averaged 2.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 8.0 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

4.5ppb

Highest yearly average, 2020 to 2022

2022 average: 3.5 ppb

Averaged by year, the highest was 4.5 ppb, in 2020, below EPA’s legal limit of 80 ppb. In 2022, the latest year on file, it averaged 3.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.5 ppb, in 2017.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.1ppm

Highest yearly average, 2014 to 2017

2017 average: 0.1 ppm

Averaged by year, the highest was 0.1 ppm, in 2014, below EPA’s legal limit of 4.0 ppm. In 2017, the latest year on file, its three samples averaged 0.1 ppm.

What handles it

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Nitrate
  • Uranium

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.”

  • NSF/ANSI 53

    Claims: Copper Reduction, Lead Reduction

    For: Copper, Lead

  • NSF/ANSI 58

    Claims: Copper Reduction, Lead Reduction

    For: Copper, 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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyAug. 8, 2025—Unaddressed
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyAug. 8, 2025—Unaddressed
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyAug. 8, 2025—Unaddressed
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Resolved
Lead and Copper RuleA required study or plan for corrosion control was not done on time.EPA: OCCT/SOWT Study/RecommendationJuly 11, 2023—Resolved
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencyMay 17, 2023—Resolved
Lead and Copper RuleA required study or plan for corrosion control was not done on time.EPA: OCCT/SOWT Study/RecommendationJuly 11, 2022—Resolved
Groundwater RuleA significant problem found in a state inspection was not fixed on time.EPA: Failure To Address DeficiencySept. 6, 2021—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 14 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5), total trihalomethanes (TTHM), arsenic, nitrate and uranium results here are Louisiana’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Chromium (total) and fluoride come from EPA’s file alone, which ends in 2019. Town of Gueydan 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 didn’t sample this utility; CDC’s yearly averages for Louisiana cover 2020 to 2022; EPA’s compliance samples are from April 14, 2014 to April 24, 2017.

Testing your own tap

Town of Gueydan 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 Town of Gueydan Water System serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • SGS North America, Inc. - Scott

    Scott, LA · about 33 miles

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

  • Element Materials Technology Lafayette, LLC

    Lafayette, LA · about 35 miles

    Certified for lead and copper, metals

  • LDH Lake Charles Regional Laboratory

    Lake Charles, LA · about 41 miles

    Certified for bacteria

    (337) 475-3236

All 48 certified labs for Louisiana

Sources

PWSID LA1113006. Rebuilt from EPA data on Oct. 18, 2026.

Also in Vermilion Parish

All Louisiana utilities

What to do next