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Town of Basalt

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
2,357 people
Connections
943
Water source
Groundwater influenced by surface water
Based in
Basalt, CO
County
Eagle
Owner
Local government
The ZIP code it serves

81621

The short answer

1 result is above the health goal. The worst: Uranium, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Uranium, total trihalomethanes (TTHM), nitrate, fluoride, haloacetic acids (HAA5), chromium (total) and arsenic: Colorado’s own results, samples taken from June 10, 2020 to July 9, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Uranium

Comes from the source

Above the health goal

2.3ppb

Highest yearly average, 2025

Averaged by year, the highest was 2.3 ppb, in 2025: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 4.2 ppb. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.7 ppb, in 2019.

What handles it

Below EPA’s limits5

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

10.5ppb

Highest yearly average, 2020 to 2026

2026, one sample: 3.5 ppb

Averaged by year, the highest was 10.5 ppb, in 2021, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 3.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 6.5 ppb, in 2015.

What handles it

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

Nitrate

Comes from the source

Below EPA’s limits

1.3ppm

Highest sample; found in 28 of 28

2026 average: 0.63 ppm

The highest sample, in 2024, was 1.3 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its four samples averaged 0.63 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.3 ppm, in 2019.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.19ppm

Highest yearly average, 2020 to 2022

Averaged by year, the highest was 0.19 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.24 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.24 ppm, in 2016.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

2.4ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 2.4 ppb, in 2023, 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 1.4 ppb, in 2018.

What handles it

No certification claim covers this compound yet.

Chromium (total)

Comes from the source

Below EPA’s limits

2.3ppb

Highest yearly average, 2020 to 2022

Averaged by year, the highest was 2.3 ppb, in 2022, below EPA’s legal limit of 100 ppb. Its highest single sample was 4.0 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.5 ppb, in 2019.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • 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.”

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

None of the filters TapBuff has checked so far carry these claims. Search the certifier listings for the claim above.

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. Uranium, total trihalomethanes (TTHM), nitrate, fluoride, haloacetic acids (HAA5), chromium (total) and arsenic results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. Town of Basalt’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 June 10, 2020 to July 9, 2026.

Testing your own tap

Town of Basalt’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 Town of Basalt 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 CO0119134. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Eagle County

All Colorado utilities

What to do next