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Willow Bend MHP

What EPA’s and Colorado’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals, plus violations since 2016, with the certification that handles each result.

Serves
46 people
Connections
23
Water source
Surface water bought from another system
Based in
Dallas, CO
County
Routt
Owner
Private

The short answer

2 results are above the limit’s level with no violation recorded. The worst: Haloacetic acids (HAA5), above the limit’s level, no violation. No health-based violations on file since 2016.

What handles it

What was found

Haloacetic acids (HAA5) and total trihalomethanes (TTHM): Colorado’s own results, samples taken from Aug. 2, 2026 to Aug. 2, 2026.

Above the limit’s level, no violation recorded2

Haloacetic acids (HAA5)

Forms or is added in treatment

Above the limit’s level, no violation

191ppb

Highest yearly average, 2026

Averaged by year, the highest was 191 ppb, in 2026, about 3.2 times EPA’s legal limit of 60 ppb. That is the only year on file. EPA judges this limit on running averages at each sampling point, and recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the limit’s level, no violation

163ppb

Highest yearly average, 2026

Averaged by year, the highest was 163 ppb, in 2026, about twice EPA’s legal limit of 80 ppb. That is the only year on file. EPA judges this limit on running averages at each sampling point, and recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap.

What handles it

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

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: Trihalomethanes (TTHM) Reduction

    For: Total trihalomethanes (TTHM)

    Other certifiers’ wording: VOC Reduction

  • NSF/ANSI 58

    Claim: Trihalomethanes (TTHM) Reduction

    For: Total trihalomethanes (TTHM)

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

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are Colorado’s own from 2026 on, with EPA’s national file for 2012 to 2019. Willow Bend MHP’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. 2, 2026 to Aug. 2, 2026.

Testing your own tap

Willow Bend MHP’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 Willow Bend MHP 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 CO0154843. Rebuilt from EPA data on Oct. 18, 2026.

Also in Routt County

All Colorado utilities

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