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Roaring Fork MHP

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
200 people
Connections
51
Water source
Groundwater
Based in
Northbrook, CO
County
Pitkin
Owner
Private
Hardness
Very hard
The ZIP code it serves

81621

The short answer

2 results are above the health goal. The worst: Uranium, above the health goal. 2 health-based violations since 2016.

What handles it

What was found

Uranium, arsenic, fluoride, nitrate, chromium (total), haloacetic acids (HAA5) and total trihalomethanes (TTHM): Colorado’s own results, samples taken from March 11, 2020 to July 21, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Uranium

Comes from the source

Above the health goal

3.8ppb

Highest yearly average, 2025

Averaged by year, the highest was 3.8 ppb, in 2025: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 3.9 ppb. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.6 ppb, in 2019.

What handles it

Arsenic

Comes from the source

Above the health goal

0.5ppb

Highest yearly average, 2020

Averaged by year, the highest was 0.5 ppb, in 2020: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 1.0 ppb. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.19 ppb, in 2013.

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 limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.25ppm

Highest yearly average, 2022 to 2026

Averaged by year, the highest was 0.25 ppm, in 2026, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.23 ppm, in 2013.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.22ppm

Highest sample; found in 12 of 12

2025 average: 0.18 ppm

The highest sample, in 2023, was 0.22 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its two samples averaged 0.18 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.42 ppm, in 2019.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • Haloacetic acids (HAA5)
  • Lead
  • Total trihalomethanes (TTHM)

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

    For: Uranium, 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

Hardness

Very hard, typically 220 mg/L (12.9 grains per gallon), across 3 sampling points, in 2026.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 12.9 grains per gallon, salt includedSoftener or salt-free conditioner?Colorado water hardness, utility by utility

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. OperatorAug. 1, 2020—Resolved
Coliform (TCR)Too many samples in a month tested positive for coliform bacteria.EPA: Maximum Contaminant Level Violation, Monthly (TCR)Jan. 1, 2016 to Jan. 31, 2016—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 273 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Uranium, arsenic, fluoride, nitrate, chromium (total), haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. Roaring Fork 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 March 11, 2020 to July 21, 2026.

Testing your own tap

Roaring Fork 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.

The 2 labs Colorado certifies closest to the area Roaring Fork MHP serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Eagle River W / S District

    Avon, CO · about 21 miles

    Certified for bacteria, lead and copper, metals, radioactivity

  • GeoWater Services

    Evergreen, CO · about 75 miles

    Certified for bacteria

All 54 certified labs for Colorado

Sources

PWSID CO0149685. Rebuilt from EPA data on Oct. 18, 2026.

Also in Pitkin County

All Colorado utilities

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