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City of Holyoke

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
2,540 people
Connections
1,129
Water source
Groundwater
Based in
Holyoke, CO
County
Phillips
Owner
Local government
The ZIP code it serves

80734

The short answer

2 results are above the health goal. The worst: Arsenic, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Arsenic, uranium, nitrate, fluoride, chromium (total), total trihalomethanes (TTHM) and haloacetic acids (HAA5): Colorado’s own results, samples taken from Jan. 8, 2020 to Sept. 16, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Arsenic

Comes from the source

Above the health goal

8.5ppb

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 8.5 ppb, in 2025: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 9.0 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 7.5 ppb, in 2015.

What handles it

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

Uranium

Comes from the source

Above the health goal

4.5ppb

Highest yearly average, 2024

Averaged by year, the highest was 4.5 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 5.0 ppb. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 5.0 ppb, in 2019.

What handles it

Below EPA’s limits4

Nitrate

Comes from the source

Below EPA’s limits

9.8ppm

Highest sample; found in 76 of 76

2026 average: 5.1 ppm

The highest sample, in 2022, was 9.8 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its three samples averaged 5.1 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 10.7 ppm, in 2015.

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

0.67ppm

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 0.67 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.71 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.8 ppm, in 2015.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

3.3ppb

Highest yearly average, 2022 to 2025

2025 average: 2.0 ppb

Averaged by year, the highest was 3.3 ppb, in 2022, below EPA’s legal limit of 100 ppb. Its highest single sample was 4.0 ppb. In 2025, the latest year on file, its four samples averaged 2.0 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.3 ppb, in 2015.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

1.4ppb

Highest yearly average, 2020 to 2026

2026, one sample: 1.4 ppb

Averaged by year, the highest was 1.4 ppb, in 2021, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 1.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.9 ppb, in 2012.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Haloacetic acids (HAA5)
  • Lead

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

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

    For: Arsenic, Uranium

    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

No health-based violations on file with EPA since 2016. There are 4 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Arsenic, uranium, nitrate, fluoride, chromium (total), total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. City of Holyoke’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; Colorado’s results run from Jan. 8, 2020 to Sept. 16, 2026.

Testing your own tap

City of Holyoke’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.

The lab Colorado certifies closest to the area City of Holyoke serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Northeast Colorado Health Dept.

    Sterling, CO · about 50 miles

    Certified for bacteria

All 54 certified labs for Colorado

Sources

PWSID CO0148005. Rebuilt from EPA data on Oct. 18, 2026.

Nearby

All Colorado utilities

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