Maltby, WA tap water
Supplied mostly by Cross Valley Water District, 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
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From EPA monitoring data (2015).
Nitrate (NO₃)
Up to 0.4 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From EPA monitoring data; City of Everett Public Works Dept., which supplies Alderwood Water & Wastewater District (2012–2018).
Copper at home taps (first draw)
Not detected (Low)
The 90th percentile of first-draw samples from homes: water that sat in household pipes for at least six hours.
Not detected in testing. Water that sits in household pipes overnight can still pick some up.
Published by your utility: Alderwood Water & Wastewater District's 2025 water quality report.
Chlorine or chloramine at the tap
0.2–1.4 ppm
Typical 0.7 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: Alderwood Water & Wastewater District's 2025 water quality report.
Water chemistry
General hardness
10–16 ppm
Typical 13 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
Published by your utility: Alderwood Water & Wastewater District's 2025 water quality report.
Carbonate hardness (alkalinity)
13–64 ppm
Typical 64 ppm
Moderate buffering. pH should stay fairly steady.
From EPA monitoring data; Alderwood Water & Wastewater District's 2025 water quality report (2017–2025).
pH
Supplier's figure7.1–9.1
Typical 7.7
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: City of Everett Public Works Dept., which supplies Cross Valley Water District; Alderwood Water & Wastewater District's 2025 water quality report (2015–2025).
Who supplies Maltby, WA
Cross Valley Water District
Serves 78% of residents · Buys water from City of Everett Public Works Dept. · Chlorine
- 2025 water quality report
Alderwood Water & Wastewater District
Serves 19% of residents · Buys water from City of Everett Public Works Dept. · 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.