Spring Valley, CA tap water
Supplied mostly by Helix Water District, plus 2 other utilities. Here's what the water means for your fish.
Disinfectant
Chloramine
Your water is treated with chloramine. Unlike chlorine, it doesn't gas off when water sits out, and many pitcher and fridge filters aren't rated to remove it. Conditioners that list chloramine on the label break it apart, which frees a little ammonia. Some utilities switch to plain chlorine for a few weeks a year.
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 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From California Water Board lab results; Helix Water District and San Diego County Water Authority, which supplies Otay Water District (2023–2026).
Copper at home taps
Up to 0.07 ppm (Low)
Typically not detected
Not detected in testing. Water that sits in household pipes overnight can still pick some up.
From California Water Board lab results (2023–2026).
Water chemistry
General hardness
204–209 ppm
Typical 204 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
From California Water Board lab results; Helix Water District and San Diego County Water Authority, which supplies Otay Water District (2023–2026).
Carbonate hardness (alkalinity)
105–119 ppm
Typical 105 ppm
Moderate buffering. pH should stay fairly steady.
From California Water Board lab results; Helix Water District and San Diego County Water Authority, which supplies Otay Water District (2023–2026).
pH
7.9–8.1
Typical 8.1
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From California Water Board lab results; EPA monitoring data (2017–2026).
Total dissolved solids
460–520 ppm
Typical 460 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 California Water Board lab results; Helix Water District and San Diego County Water Authority, which supplies Otay Water District (2023–2026).
Who supplies Spring Valley, CA
- 2024 water quality report
Helix Water District
Serves 59% of residents · Lake or river water · Chloramine
Otay Water District
Serves 17% of residents · Buys water from Helix Water District · Chloramine
San Diego County Water Authority
Serves 17% of residents · Lake or river water · Chloramine
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.