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Gunnison County WSD

What EPA’s and Colorado’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
800 people
Connections
330
Water source
Surface water
Based in
Gunnison, CO
County
Gunnison
Owner
Local government
The ZIP code it serves

81230

The short answer

2 results are above the health goal. The worst: Lead, above the health goal. 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.

Uranium, total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, arsenic and chromium (total): Colorado’s own results, samples taken from Jan. 6, 2020 to Aug. 20, 2026, with EPA’s 2012 to 2019 file for earlier years.

Fluoride: EPA’s compliance monitoring file, samples taken from Jan. 15, 2014 to Jan. 15, 2014. Newer results are in the utility’s annual water quality report.

Above the health goal2

Lead

Comes from pipes, often your own

Above the health goal

1.6ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 1.6 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

Uranium

Comes from the source

Above the health goal

0.84ppb

Highest yearly average, 2025

Averaged by year, the highest was 0.84 ppb, in 2025: below EPA’s legal limit of 30 ppb, but above its health goal of zero. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.2 ppb, in 2013.

What handles it

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

27.5ppb

Highest yearly average, 2020 to 2026

2026 average: 20.7 ppb

Averaged by year, the highest was 27.5 ppb, in 2021, below EPA’s legal limit of 80 ppb. Its highest single sample was 54.9 ppb. In 2026, the latest year on file, its three samples averaged 20.7 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 26.7 ppb, in 2016.

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

19.1ppb

Highest yearly average, 2020 to 2026

2026 average: 18.7 ppb

Averaged by year, the highest was 19.1 ppb, in 2024, below EPA’s legal limit of 60 ppb. Its highest single sample was 38.2 ppb. In 2026, the latest year on file, its three samples averaged 18.7 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 18.1 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.12ppm

Highest yearly average, 2014

Averaged by year, the highest was 0.12 ppm, in 2014, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.12ppm

Highest sample; found in 4 of 7

2026: not found

The highest sample, in 2022, was 0.12 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.14 ppm, in 2014.

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.
  • Arsenic
  • 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.”

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 water filters for lead, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There are 3 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Uranium, total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, arsenic and chromium (total) results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride comes from EPA’s file alone, which ends in 2019. Gunnison County WSD’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; Colorado’s results run from Jan. 6, 2020 to Aug. 20, 2026; EPA’s compliance samples are from Jan. 15, 2014 to Jan. 15, 2014.

Testing your own tap

Gunnison County WSD’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 Colorado certifies.

No lab Colorado certifies is within 75 miles of the area Gunnison County WSD serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 54 certified labs for Colorado

Sources

PWSID CO0126220. Rebuilt from EPA data on Oct. 18, 2026.

Also in Gunnison County

All Colorado utilities

What to do next