Is West Linn, OR Tap Water Safe? Quality & Contaminants

What was found in West Linn's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	1200 µg/L 12% of the EPA limit 10000 µg/L Highest in the city: MOSSY BRAE WATER DISTRICT · 100 people · 2019	1/4	SYR4
Nitrate-Nitrite	831 µg/L 8.3% of the EPA limit 10000 µg/L Highest in the city: MOSSY BRAE WATER DISTRICT · 100 people · 2019	1/4	SYR4
Copper	90.8 µg/L 7% of the EPA limit 1300 µg/L Main supplier: WEST LINN, CITY OF · 28,000 people · 2018 Highest in the city: 471.25 µg/L — RIVERBEND-RIVERBANK COMMUNITY · 225 people · 2017	3/4	SYR4
Fluoride	230 µg/L 5.8% of the EPA limit 4000 µg/L Highest in the city: RIVERBEND-RIVERBANK COMMUNITY · 225 people · 2014	2/4	SYR4
Total Haloacetic Acids (HAA5)	47.265 µg/L 79% of the EPA limit 60 µg/L Main supplier: WEST LINN, CITY OF · 28,000 people · 2019	1/4	SYR4
TTHM	44.325 µg/L 55% of the EPA limit 80 µg/L Main supplier: WEST LINN, CITY OF · 28,000 people · 2019	1/4	SYR4
Barium	28 µg/L 1.4% of the EPA limit 2000 µg/L Highest in the city: RIVERBEND-RIVERBANK COMMUNITY · 225 people · 2014	2/4	SYR4
Lead	12.2 µg/L 81% of the EPA limit 15 µg/L Main supplier: WEST LINN, CITY OF · 28,000 people · 2018	2/4	SYR4
Gross Alpha, Excl. Radon And U	5.3 pCi/L 35% of the EPA limit 15 pCi/L Highest in the city: RIVERBEND-RIVERBANK COMMUNITY · 225 people · 2017	1/4	SYR4
Lead	0.0018 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: WEST LINN, CITY OF · 28,000 people · 2024 Highest in the city: 0.0060 mg/L — RIVERBEND-RIVERBANK COMMUNITY · 225 people · 2023	3/4	LCR

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving West Linn

Supplier	Population served
WEST LINN, CITY OF	28,000
RIVERBEND-RIVERBANK COMMUNITY	225
MOSSY BRAE WATER DISTRICT	100
LAKE OSWEGO - TIGARD WATER SUPPLY	0

Frequently asked questions about West Linn tap water

Is West Linn tap water safe to drink?

EPA testing detected 10 contaminants in the water serving West Linn. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve West Linn?

4 public water suppliers report drinking-water monitoring for West Linn, Oregon to the EPA. Each is listed above with its population served.

What contaminants are in West Linn's water?

The contaminants EPA monitoring detected in West Linn include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Total Haloacetic Acids (HAA5). The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.