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St Mary Parish Water Sewerage Comm 1

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
2,823 people
Connections
1,200
Water source
Surface water
Based in
Amelia, LA
County
St. Mary Parish
Owner
Local government
The 2 ZIP codes it serves

70340, 70380

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Haloacetic acids (HAA5), above the legal limit. 3 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2007 to 2025.

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

Fluoride and chromium (total): EPA’s compliance monitoring file, samples taken from Jan. 23, 2012 to Jan. 29, 2019. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Haloacetic acids (HAA5)

Forms or is added in treatment

Above the legal limit

47.5ppb

Highest yearly average, 2020 to 2022

Averaged by year, the highest was 47.5 ppb, in 2022, below EPA’s legal limit of 60 ppb. That was also the latest year on file. EPA judges this limit at each sampling point, and recorded a violation for haloacetic acids (HAA5) at this utility in 2025. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 34.4 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

0.82ppb

90th percentile, 2025

In the latest period, 9 in 10 homes sampled were at or below 0.82 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 limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

59.9ppb

Highest yearly average, 2020 to 2022

2022 average: 51.1 ppb

Averaged by year, the highest was 59.9 ppb, in 2020, below EPA’s legal limit of 80 ppb. In 2022, the latest year on file, it averaged 51.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 45.6 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

0.3ppm

Highest yearly average, 2012 to 2019

2019, one sample: 0.055 ppm

Averaged by year, the highest was 0.3 ppm, in 2012, below EPA’s legal limit of 4.0 ppm. In 2019, the latest year on file, its one sample was 0.055 ppm.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.68ppm

Highest yearly average, 2022

Averaged by year, the highest was 0.68 ppm, in 2022, below EPA’s legal limit of 10 ppm. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.5 ppm, in 2017.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • 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.”

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
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2025 to Dec. 31, 20250.064 MG/LArchived
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2025 to Sept. 30, 20250.069 MG/LArchived
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 7 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5), total trihalomethanes (TTHM), nitrate, arsenic 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. Fluoride and chromium (total) come from EPA’s file alone, which ends in 2019. St Mary Parish Water Sewerage Comm 1’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 Jan. 23, 2012 to Jan. 29, 2019.

Testing your own tap

St Mary Parish Water Sewerage Comm 1’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 St Mary Parish Water Sewerage Comm 1 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • LDH Central Laboratory

    Baton Rouge, LA · about 51 miles

    Certified for bacteria

    (225) 219-5200

  • Curtis Environmental Services, Inc.

    LaPlace, LA · about 51 miles

    Certified for minerals and other inorganics, disinfection byproducts

  • Element Materials Technology Lafayette, LLC

    Lafayette, LA · about 62 miles

    Certified for lead and copper, metals

All 48 certified labs for Louisiana

Sources

PWSID LA1101009. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in St. Mary Parish

All Louisiana utilities

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