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Diversion Water - Old Mill Settlement

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
246 people
Connections
82
Water source
Groundwater
Based in
Prairieville, LA
County
Livingston Parish
Owner
Private
The ZIP code it serves

70726

The short answer

1 result is above the health goal. The worst: Arsenic, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

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

Arsenic, fluoride, chromium (total) and uranium: EPA’s compliance monitoring file, samples taken from May 13, 2013 to April 23, 2019. Newer results are in the utility’s annual water quality report.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

0.45ppb

Highest yearly average, 2013 to 2019

2019: not found

Averaged by year, the highest was 0.45 ppb, in 2016: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 0.89 ppb. In 2019, the latest year on file, it wasn’t found in any of its two samples.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Below EPA’s limits2

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

18ppb

Highest yearly average, 2020 to 2022

2022 average: 1.1 ppb

Averaged by year, the highest was 18 ppb, in 2021, below EPA’s legal limit of 60 ppb. In 2022, the latest year on file, it averaged 1.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.3 ppb, in 2016.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.14ppm

Highest yearly average, 2013 to 2019

2019 average: 0.1 ppm

Averaged by year, the highest was 0.14 ppm, in 2016, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.17 ppm. In 2019, the latest year on file, its two samples averaged 0.1 ppm.

What handles it

5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • Lead
  • Nitrate
  • Total trihalomethanes (TTHM)
  • 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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. 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

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Violations since 2016

No health-based violations on file with EPA since 2016. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM) results here are Louisiana’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Arsenic, fluoride, chromium (total) and uranium come from EPA’s file alone, which ends in 2019. Diversion Water - Old Mill Settlement’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 May 13, 2013 to April 23, 2019.

Testing your own tap

Diversion Water - Old Mill Settlement’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 Diversion Water - Old Mill Settlement 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 17 miles

    Certified for bacteria

    (225) 219-5200

  • LDH Amite Regional Laboratory

    Amite, LA · about 32 miles

    Certified for bacteria

    (985) 748-2011

  • Curtis Environmental Services, Inc.

    LaPlace, LA · about 33 miles

    Certified for minerals and other inorganics, disinfection byproducts

All 48 certified labs for Louisiana

Sources

PWSID LA1063115. Rebuilt from EPA data on Oct. 18, 2026.

Also in Livingston Parish

All Louisiana utilities

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