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Marshall Waterworks

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
2,363 people
Connections
640
Water source
Groundwater
Based in
Warrenton, VA
County
Fauquier
Owner
Local government
The ZIP code it serves

20115

The short answer

Nothing in EPA’s and CDC’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Arsenic: Virginia’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2021 to 2023.

Total trihalomethanes (TTHM), nitrate, fluoride, haloacetic acids (HAA5) and chromium (total): EPA’s compliance monitoring file, samples taken from July 31, 2012 to Nov. 19, 2019. Newer results are in the utility’s annual water quality report.

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

17.6ppb

Highest yearly average, 2013 to 2019

2019, one sample: 3.1 ppb

Averaged by year, the highest was 17.6 ppb, in 2013, below EPA’s legal limit of 80 ppb. Its highest single sample was 26 ppb. In 2019, the latest year on file, its one sample was 3.1 ppb.

What handles it

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

Nitrate

Comes from the source

Below EPA’s limits

1.6ppm

Highest sample; found in 11 of 31

2019 average: 0.27 ppm

The highest sample, in 2015, was 1.6 ppm, below EPA’s legal limit of 10 ppm. In 2019, the latest year on file, its four samples averaged 0.27 ppm.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.23ppm

Highest yearly average, 2014 to 2018

Averaged by year, the highest was 0.23 ppm, in 2018, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.29 ppm. That was also the latest year on file.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

1.8ppb

Highest yearly average, 2013 to 2019

2019: not found

Averaged by year, the highest was 1.8 ppb, in 2013, below EPA’s legal limit of 60 ppb. Its highest single sample was 2.2 ppb. In 2019, the latest year on file, it wasn’t found in its one sample.

What handles it

No certification claim covers this compound yet.

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Lead

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

  • Everything else. Arsenic results here are Virginia’s yearly averages as CDC publishes them, from 2021 on, with EPA’s national file for 2012 to 2019. Total trihalomethanes (TTHM), nitrate, fluoride, haloacetic acids (HAA5) and chromium (total) come from EPA’s file alone, which ends in 2019. Marshall Waterworks’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 Virginia cover 2021 to 2023; EPA’s compliance samples are from July 31, 2012 to Nov. 19, 2019.

Testing your own tap

Marshall Waterworks’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 Virginia certifies.

The 3 labs Virginia certifies closest to the area Marshall Waterworks serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • VDACS RAHL Warrenton

    Warrenton, VA · about 8 miles

    Certified for bacteria

  • Joiner Labs, LLC dba Joiner Micro Labs

    Warrenton, VA · about 8 miles

    Certified for bacteria

  • Environmental Systems Service, LTD.- Culpeper

    Culpeper, VA · about 26 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (540) 825-6660

Virginia Household Water Quality Program, Virginia Cooperative Extension: Drinking water clinics in about 70 counties a year, run through local Extension offices: pick up a kit, collect the sample on the set day, and drop it off locally. Each kit tests well, spring or cistern water for 28 things, including bacteria, nitrate, lead and arsenic. $70 a kit, with funding to help if you need it. Virginia Household Water Quality Program.

All 145 certified labs for Virginia

Sources

PWSID VA6061200. Rebuilt from EPA data on Oct. 18, 2026.

Also in Fauquier County

All Virginia utilities

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