North Washington WUA

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: 90 people
Connections: 36
Water source: Groundwater
Based in: Brighton, CO
County: Adams
Owner: Private

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. 6 health-based violations since 2016.

What was found

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

Uranium: EPA’s compliance monitoring file, samples taken from Dec. 10, 2019 to Dec. 10, 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

49.1ppb

Highest yearly average, 2022 to 2025

2025 average: 43.6 ppb

Averaged by year, the highest was 49.1 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 55.7 ppb. In 2025, the latest year on file, its two samples averaged 43.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 52.5 ppb, in 2014.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.4ppm

Highest yearly average, 2021

Averaged by year, the highest was 1.4 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.5 ppm. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.8 ppm, in 2017.

What handles it

NSF/ANSI 58 look for “Fluoride Reduction”
NSF/ANSI 53 look for “Fluoride”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

3.8ppb

Highest yearly average, 2022 to 2025

2025, one sample: 3.8 ppb

Averaged by year, the highest was 3.8 ppb, in 2022, below EPA’s legal limit of 60 ppb. In 2025, the latest year on file, its one sample was 3.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 10.5 ppb, in 2015.

What handles it

No certification claim covers this compound yet.

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

Arsenic
Chromium (total)
Lead
Nitrate
Uranium

Violations since 2016

Contaminant or rule	Type	Period	Measured	Status
Stage 1 Disinfectants and Disinfection Byproducts Rule	Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator	Aug. 1, 2026	—	Addressed
Groundwater Rule	A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency	Aug. 23, 2024	—	Addressed
Groundwater Rule	A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency	Aug. 23, 2024	—	Addressed
Groundwater Rule	A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency	Aug. 23, 2024	—	Addressed
Stage 1 Disinfectants and Disinfection Byproducts Rule	Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator	Aug. 1, 2023	—	Resolved
Groundwater Rule	A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency	Sept. 16, 2021	—	Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 140 monitoring or reporting violations not shown.

What this report can’t tell you

Everything else. Total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), arsenic, chromium (total) and nitrate 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. North Washington WUA’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 Dec. 9, 2020 to Sept. 10, 2026; EPA’s compliance samples are from Dec. 10, 2019 to Dec. 10, 2019.

Testing your own tap

North Washington WUA’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.

No lab Colorado certifies is within 75 miles of the area North Washington WUA serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 54 certified labs for Colorado