Union Hill-Novelty Hill, WA tap water
Supplied mostly by City of Redmond Water System, plus 3 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
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From EPA monitoring data (2012–2019).
Nitrate (NO₃)
Up to 4.9 ppm (Low)
Typical 0.2 ppm
Low, so water changes lower your tank's nitrate well.
From City of Redmond Water System's 2025 water quality report; EPA monitoring data; Seattle Public Utilities, which supplies Woodinville Water District; Ne Sammamish Sewer & Water District, which supplies Sammamish Plateau Water & Sewer (2012–2025).
Chlorine or chloramine at the tap
0.2–1.6 ppm
Typical 0.8 ppm
At tap levels, chlorine and chloramine are toxic to fish, shrimp and the bacteria in a filter. Water conditioners are made for this range.
Published by your utility: City of Redmond Water System's 2025 water quality report.
Water chemistry
General hardness
20–103 ppm
Typical 21 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From City of Redmond Water System's website; Seattle Public Utilities, which supplies Woodinville Water District.
Carbonate hardness (alkalinity)
19–23 ppm
Typical 19 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From City of Redmond Water System's website; Seattle Public Utilities, which supplies Woodinville Water District.
pH
7.5–8.5
Typical 8.2
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From City of Redmond Water System's website; Seattle Public Utilities, which supplies Woodinville Water District.
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 City of Redmond Water System; Seattle Public Utilities, which supplies Woodinville Water District.
Who supplies Union Hill-Novelty Hill, WA
- 2025 water quality report
City of Redmond Water System
Serves 45% of residents · Buys water from Rose Hill Water District · Chlorine
Union Hill Water Association Inc
Serves 29% of residents · Groundwater (wells) · Disinfectant not listed
Woodinville Water District
Serves 12% of residents · Buys water from Seattle Public Utilities · Chlorine
Sammamish Plateau Water & Sewer
Serves 9% of residents · Buys water from Ne Sammamish Sewer & Water District · 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.