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Ranch at Coulter Creek 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
27 people
Connections
15
Water source
Groundwater
Based in
Carbondale, CO
County
Garfield
Owner
Private

The short answer

1 result is above EPA’s legal limit, and 2 more are above the health goal. The worst: Arsenic, above the legal limit. 2 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2025 to 2026.

Arsenic, uranium, total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), nitrate and chromium (total): Colorado’s own results, samples taken from Aug. 28, 2025 to Aug. 17, 2026.

Above the legal limit1

Arsenic

Comes from the source

Above the legal limit

13ppb

Highest yearly average, 2025 to 2026

2026 average: 7.7 ppb

Averaged by year, the highest was 13 ppb, in 2025, above EPA’s legal limit of 10 ppb. In 2026, the latest year on file, its three samples averaged 7.7 ppb. EPA recorded a violation for arsenic at this utility in 2026.

What handles it

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

Above the health goal2

Uranium

Comes from the source

Above the health goal

5.4ppb

Highest yearly average, 2025 to 2026

2026 average: 3.9 ppb

Averaged by year, the highest was 5.4 ppb, in 2025: below EPA’s legal limit of 30 ppb, but above its health goal of zero. In 2026, the latest year on file, its three samples averaged 3.9 ppb.

What handles it

Lead

Comes from pipes, often your own

Above the health goal

1.5ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 1.5 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

Below EPA’s limits5

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

17.9ppb

Highest yearly average, 2025 to 2026

Averaged by year, the highest was 17.9 ppb, in 2026, below EPA’s legal limit of 80 ppb. That was also the latest year on file.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.29ppm

Highest yearly average, 2025 to 2026

2026 average: 0.26 ppm

Averaged by year, the highest was 0.29 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its three samples averaged 0.26 ppm.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

3.5ppb

Highest yearly average, 2025 to 2026

Averaged by year, the highest was 3.5 ppb, in 2026, below EPA’s legal limit of 60 ppb. That was also the latest year on file.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.3ppm

Highest sample; found in 4 of 4

2026 average: 0.23 ppm

The highest sample, in 2026, was 0.3 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its three samples averaged 0.23 ppm.

What handles it

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

Chromium (total)

Comes from the source

Below EPA’s limits

3.0ppb

Highest yearly average, 2025 to 2026

2026 average: 3.0 ppb

Averaged by year, the highest was 3.0 ppb, in 2025, below EPA’s legal limit of 100 ppb. Its highest single sample was 5.0 ppb. In 2026, the latest year on file, its three samples averaged 3.0 ppb.

What handles it

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

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

    For: Arsenic, Lead

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

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

    For: Arsenic, Uranium, Lead

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
ArsenicThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2026 to March 31, 20260.013 MG/LArchived
Stage 1 Disinfectants and Disinfection Byproducts RuleTreatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. OperatorJune 2, 2025—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 143 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, uranium, total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), nitrate and chromium (total) results here are Colorado’s own from 2025 on, with EPA’s national file for 2012 to 2019. Ranch at Coulter Creek 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. 28, 2025 to Aug. 17, 2026.

Testing your own tap

Ranch at Coulter Creek 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.

No lab Colorado certifies is within 75 miles of the area Ranch at Coulter Creek HOA 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 CO0123666. Rebuilt from EPA data on Oct. 18, 2026.

Also in Garfield County

All Colorado utilities

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