Skip to content
TapBuff
ZIP

Hornersville PWS

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
526 people
Connections
261
Water source
Groundwater
Based in
Hornersville, MO
County
Dunklin
Owner
Local government
The ZIP code it serves

63855

The short answer

1 result is above the health goal. The worst: Arsenic, above the health goal. 2 health-based violations since 2016.

What handles it

What was found

Arsenic, haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM): Missouri’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2020 to 2023, with EPA’s 2012 to 2019 file for earlier years.

Chromium (total) and fluoride: EPA’s compliance monitoring file, samples taken from Aug. 9, 2012 to June 26, 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

8.4ppb

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 8.4 ppb, in 2023: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 11.5 ppb, in 2015, and EPA recorded a violation in 2016.

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 limits4

Chromium (total)

Comes from the source

Below EPA’s limits

16.4ppb

Highest yearly average, 2012 to 2019

2019 average: 3.5 ppb

Averaged by year, the highest was 16.4 ppb, in 2015, below EPA’s legal limit of 100 ppb. Its highest single sample was 16.6 ppb. In 2019, the latest year on file, its two samples averaged 3.5 ppb.

What handles it

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.62ppm

Highest yearly average, 2012 to 2019

2019 average: 0.6 ppm

Averaged by year, the highest was 0.62 ppm, in 2015, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.63 ppm. In 2019, the latest year on file, its two samples averaged 0.6 ppm.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

5.9ppb

Highest yearly average, 2022

Averaged by year, the highest was 5.9 ppb, in 2022, below EPA’s legal limit of 60 ppb. That is the only year on file.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.1ppm

Highest yearly average, 2020 to 2023

2023: not found

Averaged by year, the highest was 0.1 ppm, in 2020, below EPA’s legal limit of 10 ppm. In 2023, the latest year on file, it wasn’t found. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.069 ppm, in 2015.

What handles it

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

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

Compare five-year costs

The best reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Revised Total Coliform RuleE. coli was confirmed in the water system.EPA: Maximum Contaminant Level Violation, E. coli (RTCR)Sept. 1, 2018 to Sept. 30, 2018—Resolved
ArsenicThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2016 to June 30, 201610.6 UG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 16 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM) results here are Missouri’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. Hornersville PWS’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 Missouri cover 2020 to 2023; EPA’s compliance samples are from Aug. 9, 2012 to June 26, 2019.

Testing your own tap

Hornersville PWS’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 Missouri certifies.

No lab Missouri certifies is within 75 miles of the area Hornersville PWS serves on the state’s list. Some take samples by mail; the state’s page lists them all.

Missouri State Public Health Laboratory: Coliform and E. coli testing for private wells and other private drinking water sources, in kits from your local public health agency. A free state courier can carry the sample to the lab overnight. The handling fee is $10, by check or money order. Private Drinking Water Bacteriological Testing, Missouri Department of Health and Senior Services.

All 64 certified labs for Missouri

Sources

PWSID MO4010379. Rebuilt from EPA data on Oct. 18, 2026.

Also in Dunklin County

All Missouri utilities

What to do next