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Hi - Line Colony

What EPA’s and Montana’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
92 people
Connections
18
Water source
Groundwater
Based in
Whitlash, MT
County
Liberty
Owner
Private

The short answer

Nothing in EPA’s and Montana’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

Fluoride, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), arsenic, chromium (total) and uranium: Montana’s own results, samples taken from Aug. 11, 2025 to Aug. 11, 2026.

Below EPA’s limits4

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.76ppm

Highest yearly average, 2025

Averaged by year, the highest was 0.76 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

3.2ppb

Highest yearly average, 2025 to 2026

2026: not found

Averaged by year, the highest was 3.2 ppb, in 2025, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, it wasn’t found in its one sample.

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

0.087ppm

Highest sample; found in 1 of 2

2026: not found

The highest sample, in 2025, was 0.087 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

0.45ppb

Highest yearly average, 2025 to 2026

2026: not found

Averaged by year, the highest was 0.45 ppb, in 2025, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

No certification claim covers this compound yet.

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

Violations since 2016

No health-based violations on file with EPA since 2016. There are 28 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Fluoride, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), arsenic, chromium (total) and uranium results here are Montana’s own from 2025 on, with EPA’s national file for 2012 to 2019. Hi - Line Colony’s own annual report, which it must send you every year, has 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; Montana’s results run from Aug. 11, 2025 to Aug. 11, 2026.

Testing your own tap

Hi - Line Colony’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 Montana certifies.

No lab Montana certifies is within 75 miles of the area Hi - Line Colony serves on the state’s list. Some take samples by mail; the state’s page lists them all.

Montana State Environmental Laboratory: Private well testing packages for bacteria, metals, nutrients, anions, organic chemicals and more, open to the public. Samples can be mailed, sent by the lab's free courier, or dropped off at the lab. Environmental Laboratory, Montana Department of Public Health and Human Services.

All 36 certified labs for Montana

Sources

PWSID MT0005185. Rebuilt from EPA data on Oct. 18, 2026.

Also in Liberty County

All Montana utilities

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