Vallejo, CA tap water
Supplied mostly by City of Vallejo, 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 California Water Board lab results (2023–2026).
Nitrate (NO₃)
Up to 1.9 ppm (Low)
Typical 1.9 ppm
Low, so water changes lower your tank's nitrate well.
From City of Vallejo's 2024 water quality report; California Water Board lab results (2023–2026).
Copper at home taps (first draw)
Up to 0.3 ppm (Low)
The 90th percentile of first-draw samples from homes: water that sat in household pipes for at least six hours.
Low. Water that sits in household pipes overnight can carry more than this.
From City of Vallejo's 2024 water quality report; California Water Board lab results (2023–2024).
Chlorine or chloramine at the tap
0.5–1.8 ppm
Typical 0.5 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 Vallejo's 2024 water quality report.
Water chemistry
General hardness
67–221 ppm
Typical 135 ppm
Moderately soft to medium. Suits most community fish and plants.
From City of Vallejo's 2024 water quality report; California Water Board lab results (2023–2024).
Carbonate hardness (alkalinity)
130–140 ppm
Typical 140 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results (2023–2024).
pH
8.2–8.3
Typical 8.2
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From California Water Board lab results (2023–2025).
Total dissolved solids
120–360 ppm
Typical 211 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 City of Vallejo's 2024 water quality report; California Water Board lab results (2023–2024).
Who supplies Vallejo, CA
- 2024 water quality report
City of Vallejo
Serves 51% of residents · Lake or river water · Chlorine
City of Vallejo-Lakes System
Serves 50% of residents · Lake or river water · 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.