Is Union, WA Tap Water Safe? Quality & Contaminants

What was found in Union'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	700 µg/L 7% of the EPA limit 10000 µg/L Main supplier: ALDERBROOK WATER CO · 2,154 people · 2019 Highest in the city: 4745 µg/L — WOODLAND MANOR · 192 people · 2019	15/27	SYR4
Nitrate-Nitrite	670 µg/L 6.7% of the EPA limit 10000 µg/L Main supplier: ALDERBROOK WATER CO · 2,154 people · 2017 Highest in the city: 4180 µg/L — WOODLAND MANOR · 192 people · 2017	9/27	SYR4
Copper	2 µg/L 0.2% of the EPA limit 1300 µg/L Main supplier: ALDERBROOK WATER CO · 2,154 people · 2017 Highest in the city: 30 µg/L — CANAL MUTUAL WATER · 167 people · 2016	6/27	SYR4
Lead	26 µg/L 173% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the city: BAY EAST · 96 people · 2019	8/27	SYR4
TTHM	23.15 µg/L 29% of the EPA limit 80 µg/L Highest in the city: BAYSHORE · 130 people · 2014	3/27	SYR4
Chloroform	19.705 µg/L No EPA limit set Highest in the city: BAYSHORE · 130 people · 2017	3/27	SYR4
Total Haloacetic Acids (HAA5)	10.425 µg/L 17% of the EPA limit 60 µg/L Highest in the city: BAYSHORE · 130 people · 2017	1/27	SYR4
Chromium	3 µg/L 3% of the EPA limit 100 µg/L Main supplier: ALDERBROOK WATER CO · 2,154 people · 2017 Highest in the city: 6 µg/L — VIEW RIDGE HEIGHTS · 271 people · 2016	5/27	SYR4
Trichloroacetic Acid	5.675 µg/L No EPA limit set Highest in the city: BAYSHORE · 130 people · 2017	1/27	SYR4
Dichloroacetic Acid	5 µg/L No EPA limit set Highest in the city: BAYSHORE · 130 people · 2017	1/27	SYR4
Bromodichloromethane	2.97 µg/L No EPA limit set Highest in the city: BAYSHORE · 130 people · 2017	2/27	SYR4
Arsenic	2 µg/L 20% of the EPA limit 10 µg/L Highest in the city: HIGHLAND ESTATES · 110 people · 2014	5/27	SYR4
Barium	1 µg/L 0.1% of the EPA limit 2000 µg/L Main supplier: ALDERBROOK WATER CO · 2,154 people · 2017 Highest in the city: 2 µg/L — CHERRY PARK · 111 people · 2017	3/27	SYR4
Selenium	1 µg/L 2% of the EPA limit 50 µg/L Main supplier: ALDERBROOK WATER CO · 2,154 people · 2017	1/27	SYR4
Dibromochloromethane	0.5000 µg/L No EPA limit set Highest in the city: BAYSHORE · 130 people · 2017	1/27	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ALDERBROOK WATER CO · 2,154 people · 2023 Highest in the city: 0.0100 mg/L — WOODLAND MANOR · 192 people · 2024	27/27	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 Union

Supplier	Population served
ALDERBROOK WATER CO	2,154
UNION	700
VIEW RIDGE HEIGHTS	271
WOODLAND MANOR	192
VUECREST	191
CANAL MUTUAL WATER	167
BELLWOOD A	163
BAYSHORE	130
HOLIDAY BEACH WATER SUPPLY	130
TWANOH HEIGHTS COMMUNITY CLUB	118
CHERRY PARK	111
HIGHLAND ESTATES	110
ARCADIA ESTATES	110
BAY EAST	96
SPRINGWOOD	90
WONDERLAND WATER COMPANY	82
TWANOH TERRACE WATER CO	75
TIGER LAKE TERRACE TRACTS	70
RHODODENDRON PLACE	70
ORCHARD BEACH COMMUNITY	64
NEW PINE ACRES	60
BOLDUC COMMUNITY	51
AGATE BEACH	48
CANYONWOOD BEACH WATER SUPPLY	43
MOUNTAIN VIEW	41
VIEWCREST BEACH	40
BEL AIRE COVE	32

Frequently asked questions about Union tap water

Is Union tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Union. 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 Union?

27 public water suppliers report drinking-water monitoring for Union, Washington to the EPA. Each is listed above with its population served.

What contaminants are in Union's water?

The contaminants EPA monitoring detected in Union include Nitrate, Nitrate-Nitrite, Copper, Lead, TTHM. 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.