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MT Princeton 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
79 people
Connections
57
Water source
Groundwater bought from another system
Based in
Nathrop, CO
County
Chaffee
Owner
Private

The short answer

1 result is above the limit’s level with no violation recorded, and 2 more are above the health goal. The worst: Fluoride, above the limit’s level, no violation. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 1997 to 2025.

Fluoride, uranium, total trihalomethanes (TTHM) and haloacetic acids (HAA5): Colorado’s own results, samples taken from Nov. 25, 2024 to Aug. 17, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the limit’s level, no violation recorded1

Fluoride

Forms or is added in treatment

Above the limit’s level, no violation

10.9ppm

Highest yearly average, 2024 to 2026

2026 average: 0.9 ppm

Averaged by year, the highest was 10.9 ppm, in 2024, about 2.7 times EPA’s legal limit of 4.0 ppm. Its highest single sample was 11.8 ppm. In 2026, the latest year on file, its 20 samples averaged 0.9 ppm. EPA judges this limit on running averages at each sampling point, and recorded no violation for fluoride 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

Above the health goal2

Uranium

Comes from the source

Above the health goal

2.8ppb

Highest yearly average, 2026

Averaged by year, the highest was 2.8 ppb, in 2026: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 2.8 ppb. That is the only year on file.

What handles it

Lead

Comes from pipes, often your own

Above the health goal

0.2ppb

90th percentile, 2025

In the latest period, 9 in 10 homes sampled were at or below 0.2 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 limits2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

7.0ppb

Highest yearly average, 2025 to 2026

Averaged by year, the highest was 7.0 ppb, in 2026, below EPA’s legal limit of 80 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.0 ppb, in 2017.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

2.0ppb

Highest yearly average, 2025 to 2026

2026: not found

Averaged by year, the highest was 2.0 ppb, in 2025, below EPA’s legal limit of 60 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 1.3 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

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: Fluoride, Lead Reduction

    For: Fluoride, Lead

  • NSF/ANSI 58

    Claims: Fluoride Reduction, Uranium, Lead Reduction

    For: Fluoride, Uranium, Lead

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 water filters for fluoride, ranked

The best water filters for lead, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryJan. 2, 2026—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 2 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Fluoride, uranium, total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Colorado’s own from 2024 on, with EPA’s national file for 2012 to 2019. MT Princeton 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 Nov. 25, 2024 to Aug. 17, 2026.

Testing your own tap

MT Princeton 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 MT Princeton 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 CO0108501. Rebuilt from EPA data on Oct. 18, 2026.

Also in Chaffee County

All Colorado utilities

What to do next