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Town of Nunn

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
499 people
Connections
225
Water source
Surface water bought from another system
Based in
Nunn, CO
County
Weld
Owner
Local government
The ZIP code it serves

80648

The short answer

Nothing in EPA’s and Colorado’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 2.1 ppm, for the period ending June 30, 1994. None since is on file, so it is not counted as a current finding.

Total trihalomethanes (TTHM) and haloacetic acids (HAA5): Colorado’s own results, samples taken from March 17, 2020 to Sept. 15, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

75.7ppb

Highest yearly average, 2020 to 2026

2026 average: 71.8 ppb

Averaged by year, the highest was 75.7 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 93.9 ppb. In 2026, the latest year on file, its three samples averaged 71.8 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 92.4 ppb, in 2016.

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

31.6ppb

Highest yearly average, 2020 to 2026

2026 average: 30.1 ppb

Averaged by year, the highest was 31.6 ppb, in 2022, below EPA’s legal limit of 60 ppb. Its highest single sample was 50.9 ppb. In 2026, the latest year on file, its three samples averaged 30.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 37.2 ppb, in 2016.

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

Violations since 2016

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

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. Town of Nunn’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 17, 2020 to Sept. 15, 2026.

Testing your own tap

Town of Nunn’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 3 labs Colorado certifies closest to the area Town of Nunn serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • IEH-Warren Analytical Laboratory

    Greeley, CO · about 22 miles

    Certified for bacteria

  • Weld County Department of Public Health & Environment

    Greeley, CO · about 22 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, radioactivity

  • Colorado State University

    Fort Collins, CO · about 22 miles

    Certified for bacteria

All 54 certified labs for Colorado

Sources

PWSID CO0162559. Rebuilt from EPA data on Oct. 18, 2026.

Also in Weld County

All Colorado utilities

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