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Ukon Water Company

What EPA’s and Utah’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
1,465 people
Connections
515
Water source
Groundwater
Based in
Fielding, UT
County
Box Elder
Owner
Private
The 3 ZIP codes it serves

84306, 84311, 84312

The short answer

1 result is above the limit’s level with no violation recorded, and 1 more is above the health goal. The worst: Arsenic, above the limit’s level, no violation. No health-based violations on file since 2016.

What handles it

What was found

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

Arsenic, nitrate, fluoride and chromium (total): Utah’s own results, samples taken from March 10, 2020 to Sept. 25, 2025, with EPA’s 2012 to 2019 file for earlier years.

Total trihalomethanes (TTHM) and haloacetic acids (HAA5): EPA’s compliance monitoring file, samples taken from Sept. 24, 2013 to Sept. 10, 2019. Newer results are in the utility’s annual water quality report.

Above the limit’s level, no violation recorded1

Arsenic

Comes from the source

Above the limit’s level, no violation

10.5ppb

Highest yearly average, 2020 to 2025

Averaged by year, the highest was 10.5 ppb, in 2025, above EPA’s legal limit of 10 ppb. Its highest single sample was 12.9 ppb. That was also the latest year on file. EPA judges this limit on running averages at each sampling point, and recorded no violation for arsenic at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 9.9 ppb, in 2014, and EPA recorded a violation in 2012.

What handles it

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

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

1.4ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 1.4 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

Nitrate

Comes from the source

Below EPA’s limits

3.5ppm

Highest sample; found in 16 of 18

2025 average: 3.5 ppm

The highest sample, in 2025, was 3.5 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its three samples averaged 3.5 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.8 ppm, in 2016.

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

0.98ppm

Highest yearly average, 2022 to 2025

2025 average: 0.67 ppm

Averaged by year, the highest was 0.98 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.3 ppm. In 2025, the latest year on file, its three samples averaged 0.67 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.8 ppm, in 2019.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

9.6ppb

Highest yearly average, 2013 to 2019

2019, one sample: 7.8 ppb

Averaged by year, the highest was 9.6 ppb, in 2017, below EPA’s legal limit of 80 ppb. In 2019, the latest year on file, its one sample was 7.8 ppb.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

3.1ppb

Highest yearly average, 2013 to 2019

2019, one sample: 2.8 ppb

Averaged by year, the highest was 3.1 ppb, in 2017, below EPA’s legal limit of 60 ppb. In 2019, the latest year on file, its one sample was 2.8 ppb.

What handles it

No certification claim covers this compound yet.

One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)

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: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Arsenic, Lead

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

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Arsenic, Lead

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

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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There are 14 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Arsenic, nitrate, fluoride and chromium (total) results here are Utah’s own from 2020 on, with EPA’s national file for 2012 to 2019. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) come from EPA’s file alone, which ends in 2019. Ukon Water Company’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; Utah’s results run from March 10, 2020 to Sept. 25, 2025; EPA’s compliance samples are from Sept. 24, 2013 to Sept. 10, 2019.

Testing your own tap

Ukon Water Company’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 Utah certifies.

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

  • Bear River District Health Department Water Laboratory

    Logan, UT · about 15 miles

    Certified for bacteria, nitrate

    (435) 792-6578

  • Brigham City Laboratory

    Brigham City, UT · about 19 miles

    Certified for bacteria, minerals and other inorganics

    (435) 226-1443

  • Northrup Grumman Space Systems Environmental Laboratory

    Corinne, UT · about 27 miles

    Certified for nitrate, lead and copper, metals, minerals and other inorganics

    (801) 863-8117

All 60 certified labs for Utah

Sources

PWSID UTAH02014. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Box Elder County

All Utah utilities

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