Bone Mesa Domestic WD

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: 400 people
Connections: 165
Water source: Groundwater influenced by surface water
Based in: Paonia, CO
County: Delta
Owner: Local government

The ZIP code it serves

81428

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. 7 health-based violations since 2016.

What was found

Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, arsenic, chromium (total) and fluoride: Colorado’s own results, samples taken from Aug. 31, 2020 to Aug. 3, 2026, with EPA’s 2012 to 2019 file for earlier years.

Uranium: EPA’s compliance monitoring file, samples taken from Dec. 16, 2019 to Dec. 16, 2019. Newer results are in the utility’s annual water quality report.

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

21.5ppb

Highest yearly average, 2020 to 2026

2026, one sample: 5.4 ppb

Averaged by year, the highest was 21.5 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 44.6 ppb. In 2026, the latest year on file, its one sample was 5.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 14.3 ppb, in 2019.

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

6.0ppb

Highest yearly average, 2020 to 2026

2026, one sample: 2.4 ppb

Averaged by year, the highest was 6.0 ppb, in 2023, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 2.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 14.6 ppb, in 2013.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.7ppm

Highest sample; found in 12 of 12

2026, one sample: 0.7 ppm

The highest sample, in 2025, was 0.7 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 0.7 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.84 ppm, in 2014.

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

Contaminant or rule	Type	Period	Measured	Status
Interim Enhanced Surface Water Treatment Rule	Too many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)	Aug. 1, 2023 to Aug. 31, 2023	—	Resolved
Interim Enhanced Surface Water Treatment Rule	Too many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)	July 1, 2023 to July 31, 2023	—	Resolved
Interim Enhanced Surface Water Treatment Rule	Too many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)	June 1, 2023 to June 30, 2023	—	Resolved
Interim Enhanced Surface Water Treatment Rule	Too many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)	May 1, 2023 to May 31, 2023	—	Resolved
Interim Enhanced Surface Water Treatment Rule	Too many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)	April 1, 2023 to April 30, 2023	—	Resolved
Surface Water Treatment Rule	Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)	Jan. 1, 2022 to Jan. 31, 2022	—	Resolved
Lead and Copper Rule	OCCT/SOWT Treatment Installation/Demonstration	Dec. 2, 2021	—	Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 138 monitoring or reporting violations not shown.

What this report can’t tell you

Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, arsenic, chromium (total) and fluoride results here are Colorado’s own from 2020 on, with EPA’s national file for 2012 to 2019. Uranium comes from EPA’s file alone, which ends in 2019. Bone Mesa Domestic WD’s own annual report, which it must send you every year, has newer results for those and 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. 31, 2020 to Aug. 3, 2026; EPA’s compliance samples are from Dec. 16, 2019 to Dec. 16, 2019.

Testing your own tap

Bone Mesa Domestic WD’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 Bone Mesa Domestic WD serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

Mesa County Public Health Regional Laboratory
Grand Junction, CO · about 48 miles
Certified for bacteria
Eagle River W / S District
Avon, CO · about 73 miles
Certified for bacteria, lead and copper, metals, radioactivity