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Cavanaugh Hills WS

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
286 people
Connections
118
Water source
Groundwater
Based in
Keenesburg, CO
County
Adams
Owner
Private
The ZIP code it serves

80643

The short answer

1 result is 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, fluoride, total trihalomethanes (TTHM), chromium (total), haloacetic acids (HAA5), nitrate and uranium: Colorado’s own results, samples taken from Feb. 18, 2020 to Sept. 22, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

3.7ppb

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 3.7 ppb, in 2025: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 4.0 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.0 ppb, 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”

Below EPA’s limits4

Fluoride

Forms or is added in treatment

Below EPA’s limits

2.5ppm

Highest yearly average, 2020 to 2025

2025 average: 2.3 ppm

Averaged by year, the highest was 2.5 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its three samples averaged 2.3 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.5 ppm, in 2017.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

20.7ppb

Highest yearly average, 2020 to 2026

2026, one sample: 12.1 ppb

Averaged by year, the highest was 20.7 ppb, in 2020, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 12.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 20.7 ppb, in 2014.

What handles it

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

Chromium (total)

Comes from the source

Below EPA’s limits

8.0ppb

Highest yearly average, 2022 to 2025

2025 average: 7.3 ppb

Averaged by year, the highest was 8.0 ppb, in 2024, below EPA’s legal limit of 100 ppb. Its highest single sample was 10 ppb. In 2025, the latest year on file, its three samples averaged 7.3 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.0 ppb, in 2012.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

3.5ppb

Highest yearly average, 2020 to 2026

2026, one sample: 2.1 ppb

Averaged by year, the highest was 3.5 ppb, in 2020, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 2.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 9.9 ppb, in 2014.

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.
  • Lead
  • Nitrate
  • Uranium

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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    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

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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, fluoride, total trihalomethanes (TTHM), chromium (total), haloacetic acids (HAA5), nitrate and uranium results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. Cavanaugh Hills WS’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 Feb. 18, 2020 to Sept. 22, 2026.

Testing your own tap

Cavanaugh Hills WS’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 3 labs Colorado certifies closest to the area Cavanaugh Hills WS serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • IEH-Warren Analytical Laboratory

    Greeley, CO · about 25 miles

    Certified for bacteria

  • Weld County Department of Public Health & Environment

    Greeley, CO · about 25 miles

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

  • Colorado Analytical Laboratory - Commerce City

    Commerce City, CO · about 26 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS, radioactivity

All 54 certified labs for Colorado

Sources

PWSID CO0101166. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Adams County

All Colorado utilities

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