Issaquah, WA tap water
Supplied mostly by Issaquah Water System, plus 2 other utilities. 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 4.7 ppm (Low)
Typical 1.5 ppm
Low, so water changes lower your tank's nitrate well.
From the utility that supplies yours: City of Redmond Water System and Seattle Public Utilities, which supplies Issaquah Water System; Ne Sammamish Sewer & Water District, which supplies Sammamish Plateau Water & Sewer; City of Redmond Water System and Seattle Public Utilities, which supplies City of Bellevue (2012–2025).
Water chemistry
General hardness
Supplier's figure20–103 ppm
Typical 23 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From the utility that supplies yours: City of Redmond Water System and Seattle Public Utilities, which supplies Issaquah Water System; City of Redmond Water System and Seattle Public Utilities, which supplies City of Bellevue.
Carbonate hardness (alkalinity)
Supplier's figure19–23 ppm
Typical 21 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From the utility that supplies yours: City of Redmond Water System and Seattle Public Utilities, which supplies Issaquah Water System; City of Redmond Water System and Seattle Public Utilities, which supplies City of Bellevue.
pH
Supplier's figure6.6–8.5
Typical 7.2
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: City of Bellevue, which supplies Issaquah Water System, measured before treatment; City of Redmond Water System and Seattle Public Utilities, which supplies City of Bellevue (2013–2015).
Total dissolved solids
Supplier's figure36 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
From the utility that supplies yours: Seattle Public Utilities, which supplies Issaquah Water System; Seattle Public Utilities, which supplies City of Bellevue.
Who supplies Issaquah, WA
Issaquah Water System
Serves 73% of residents · Buys water from City of Bellevue · Chlorine
Sammamish Plateau Water & Sewer
Serves 20% of residents · Buys water from Ne Sammamish Sewer & Water District · Chlorine
City of Bellevue
Serves 8% of residents · Buys water from City of Redmond Water System · 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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.