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Gambel Oaks HOA

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
350 people
Connections
79
Water source
Groundwater
Based in
Elizabeth, CO
County
Elbert
Owner
Private
The ZIP code it serves

80107

The short answer

1 result is above the health goal. The worst: Arsenic, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 2.1 ppm, for the period ending Dec. 31, 2006. None since is on file, so it is not counted as a current finding.

Arsenic, fluoride, total trihalomethanes (TTHM), chromium (total), haloacetic acids (HAA5), nitrate and uranium: Colorado’s own results, samples taken from Aug. 16, 2020 to Sept. 1, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

1.0ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 1.0 ppb, in 2021: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 2.0 ppb. 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 yearly average of 1.0 ppb, in 2016.

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 limits3

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.8ppm

Highest yearly average, 2020 to 2026

2026, one sample: 0.97 ppm

Averaged by year, the highest was 1.8 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its one sample was 0.97 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.8 ppm, in 2019.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

4.1ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 4.1 ppb, in 2026, below EPA’s legal limit of 80 ppb. Its highest single sample was 4.5 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.7 ppb, in 2017.

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

3.0ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 3.0 ppb, in 2025, below EPA’s legal limit of 100 ppb. Its highest single sample was 4.0 ppb. 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 yearly average of 3.0 ppb, in 2019.

What handles it

4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Haloacetic acids (HAA5)
  • 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

Compare five-year costs

The best reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Stage 1 Disinfectants and Disinfection Byproducts RuleTreatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. OperatorApril 1, 2018—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 4 monitoring or reporting violations not shown.

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. Gambel Oaks HOA’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 Aug. 16, 2020 to Sept. 1, 2026.

Testing your own tap

Gambel Oaks HOA’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 Gambel Oaks HOA serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Colorado Department of Health & Environment

    Denver, CO · about 27 miles

    Certified for bacteria

  • SGS North America, Inc. - Denver

    Denver, CO · about 30 miles

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

  • Colorado Analytical Laboratory - Commerce City

    Commerce City, CO · about 37 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 CO0120300. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Elbert County

All Colorado utilities

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