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Montezuma Cnty WD No 1

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
490 people
Connections
242
Water source
Surface water bought from another system
Based in
Cortez, CO
County
Montezuma
Owner
Local government
The ZIP code it serves

81321

The short answer

1 result is above the limit’s level with no violation recorded. The worst: Total trihalomethanes (TTHM), above the limit’s level, no violation. 1 health-based violation since 2016.

What handles it

What was found

Total trihalomethanes (TTHM) and haloacetic acids (HAA5): Colorado’s own results, samples taken from Aug. 3, 2020 to Aug. 10, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the limit’s level, no violation recorded1

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the limit’s level, no violation

110ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 110 ppb, in 2026, above EPA’s legal limit of 80 ppb. That was also the latest 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. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 75.7 ppb, in 2016.

What handles it

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

Below EPA’s limits1

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

32.6ppb

Highest yearly average, 2020 to 2026

2026, one sample: 25.1 ppb

Averaged by year, the highest was 32.6 ppb, in 2025, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 25.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 32.3 ppb, in 2018.

What handles it

No certification claim covers this compound yet.

One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Lead

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

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Addressed
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 22 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. Montezuma Cnty WD No 1’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. 3, 2020 to Aug. 10, 2026.

Testing your own tap

Montezuma Cnty WD No 1’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 lab Colorado certifies closest to the area Montezuma Cnty WD No 1 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • La Plata County Water Quality Laboratory

    Durango, CO · about 49 miles

    Certified for bacteria

All 54 certified labs for Colorado

Sources

PWSID CO0142800. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Montezuma County

All Colorado utilities

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