Mancos Rural Water Company

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: 1,300 people
Connections: 723
Water source: Surface water
Based in: Mancos, CO
County: Montezuma
Owner: Private

The ZIP code it serves

81328

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

Haloacetic acids (HAA5), total trihalomethanes (TTHM), nitrate, arsenic, chromium (total), fluoride and uranium: Colorado’s own results, samples taken from Jan. 23, 2020 to June 26, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits3

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

50.3ppb

Highest yearly average, 2020 to 2026

2026 average: 40.9 ppb

Averaged by year, the highest was 50.3 ppb, in 2021, below EPA’s legal limit of 60 ppb. Its highest single sample was 102 ppb. In 2026, the latest year on file, its two samples averaged 40.9 ppb. EPA recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 53.7 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

61.4ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 61.4 ppb, in 2026, below EPA’s legal limit of 80 ppb. Its highest single sample was 90.7 ppb. That was also the latest year on file. 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 55.3 ppb, in 2017.

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

0.12ppm

Highest sample; found in 4 of 5

2025, one sample: 0.12 ppm

The highest sample, in 2025, was 0.12 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 0.12 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.081 ppm, in 2012.

What handles it

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

5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

Arsenic
Chromium (total)
Fluoride
Lead
Uranium

Violations since 2016

No health-based violations on file with EPA since 2016. There are 32 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

Everything else. Haloacetic acids (HAA5), total trihalomethanes (TTHM), nitrate, arsenic, chromium (total), fluoride and uranium results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. Mancos Rural Water Company’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 Jan. 23, 2020 to June 26, 2026.

Testing your own tap

Mancos Rural Water Company’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 Mancos Rural Water Company serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.