Oak Harbor, WA tap water
Supplied mostly by City of Oak Harbor, plus 1 other utility. Here's what the water means for your fish.
Disinfectant
Chlorine
Your water is treated with chlorine. It slowly gases off from standing water, and any water conditioner removes it.
Safety for fish and shrimp
Nitrate (NO₃)
Supplier's figureUp to 4.3 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From the utility that supplies yours: City of Anacortes, which supplies City of Oak Harbor; City of Oak Harbor, which supplies Naval Air Station/Whidbey Island, measured before treatment (2012–2019).
Water chemistry
General hardness
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
Carbonate hardness (alkalinity)
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
pH
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
Who supplies Oak Harbor, WA
City of Oak Harbor
Serves 77% of residents · Buys water from City of Anacortes · Chlorine
Naval Air Station/Whidbey Island
Serves 20% of residents · Buys water from City of Oak Harbor · Chlorine
Our data comes from public records and is still incomplete. Many utilities don't publish every number, so we're adding more all the time. Your city's range is a starting point: testing your own tap is the only way to know exactly what's in it.
Tap water lookup covers US cities only for now. Want to know why it matters? Read our story on tap water.
Compiled by Shoal & Stem from public records. Free to cite with a link.