Laurelwood Water Users

What EPA’s and CDC’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: 200 people
Connections: 52
Water source: Groundwater
Based in: Gaston, OR
County: Washington
Owner: Private

The ZIP code it serves

97119

The short answer

Nothing in EPA’s and CDC’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 5 health-based violations 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 2.2 ppm, for the period ending Dec. 31, 2013. None since is on file, so it is not counted as a current finding.

Nitrate, total trihalomethanes (TTHM), arsenic, haloacetic acids (HAA5) and uranium: Oregon’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2020 to 2023, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits2

Nitrate

Comes from the source

Below EPA’s limits

1.1ppm

Highest yearly average, 2020 to 2023

2023: not found

Averaged by year, the highest was 1.1 ppm, in 2020, below EPA’s legal limit of 10 ppm. In 2023, the latest year on file, it wasn’t found. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.1 ppm, in 2019.

What handles it

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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

1.1ppb

Highest yearly average, 2020 to 2021

Averaged by year, the highest was 1.1 ppb, in 2021, below EPA’s legal limit of 80 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.1 ppb, in 2013.

What handles it

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

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

Arsenic
Haloacetic acids (HAA5)
Lead
Uranium

Violations since 2016

Contaminant or rule	Type	Period	Measured	Status
Groundwater Rule	Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)	June 1, 2026 to June 30, 2026	—	Archived
Groundwater Rule	Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)	Oct. 1, 2025 to Oct. 31, 2025	—	Resolved
Groundwater Rule	Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)	March 1, 2022 to March 31, 2022	—	Resolved
Groundwater Rule	Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)	Nov. 1, 2020 to Nov. 30, 2020	—	Resolved
Revised Total Coliform Rule	E. coli was confirmed in the water system.EPA: Maximum Contaminant Level Violation, E. coli (RTCR)	Oct. 1, 2017 to Oct. 31, 2017	—	Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 101 monitoring or reporting violations not shown.

What this report can’t tell you

Everything else. Nitrate, total trihalomethanes (TTHM), arsenic, haloacetic acids (HAA5) and uranium results here are Oregon’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Laurelwood Water Users’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; CDC’s yearly averages for Oregon cover 2020 to 2023.

Testing your own tap

Laurelwood Water Users’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 Oregon certifies.

The 3 labs Oregon certifies closest to the area Laurelwood Water Users serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

Alexin Analytical Laboratories, Inc.
Tigard, OR · about 21 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
(503) 639-9311
Apex Laboratories, LLC
Tigard, OR · about 21 miles
Certified for lead and copper, metals
(503) 718-2323
OMIC USA Inc.
Portland, OR · about 24 miles
(503) 223-1497

Oregon State University Extension Well Water Program: Nitrate screening of well water at many of its groundwater education events. The screening is free. Water Testing Guidance for Private Wells, OSU Well Water Program.

All 91 certified labs for Oregon

Sources

EPA UCMR 5 occurrence data, file of Oct. 15, 2026
EPA SDWA bulk download (SDWIS federal data), 2026 Q3
CDC Environmental Public Health Tracking Network, yearly averages Oregon supplied to CDC, 2020 to 2023, read Oct. 8, 2026. TapBuff’s comparisons with EPA’s limits are its own, not CDC’s or Oregon’s.
EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
Certified labs: Oregon Environmental Laboratory Accreditation Program, drinking water labs, as listed in TNI LAMS, read Oct. 13, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
Limits and goals: each contaminant’s page, with its EPA source.
How this page is built: methodology.

PWSID OR4100315. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Gaston

Also in Washington County

All Oregon utilities