La Puente, CA tap water
Supplied mostly by Suburban Water Systems-San Jose, plus 2 other utilities. Here's what the water means for your fish.
Disinfectant
Chlorine or chloramine
Utilities here use chlorine or chloramine, depending on which one serves your address. Chlorine slowly gases off from standing water; chloramine doesn't.
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)
5.3–35 ppm (Worth knowing)
Typical 16 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results (2023–2026).
Copper at home taps
0.07–0.13 ppm (Worth knowing)
Typical 0.12 ppm
Shrimp and snails are sensitive to copper. Water that sits in household pipes picks up the most; it drops once the tap has run for a minute.
From California Water Board lab results (2023–2026).
Water chemistry
General hardness
Supplier's figure82–291 ppm
Typical 227 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From the utility that supplies yours: Pomona - City, Water Dept. and La Puente Valley CWD and Covina Valley Water Company - Wholesale and Metropolitan Water Dist. of So. Cal. and Valley County Water Dist. and Walnut Valley Water District, which supplies Suburban Water Systems-San Jose; California Water Board lab results (2023–2026).
Carbonate hardness (alkalinity)
Supplier's figure68–220 ppm
Typical 131 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From the utility that supplies yours: Pomona - City, Water Dept. and La Puente Valley CWD and Covina Valley Water Company - Wholesale and Metropolitan Water Dist. of So. Cal. and Valley County Water Dist. and Walnut Valley Water District, which supplies Suburban Water Systems-San Jose; California Water Board lab results (2023–2026).
pH
Supplier's figure7–8.7
Typical 7.9
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: Pomona - City, Water Dept. and La Puente Valley CWD and Covina Valley Water Company - Wholesale and Metropolitan Water Dist. of So. Cal. and Valley County Water Dist. and Walnut Valley Water District, which supplies Suburban Water Systems-San Jose; California Water Board lab results (2023–2026).
Total dissolved solids
Supplier's figure160–666 ppm
Typical 375 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: Pomona - City, Water Dept. and La Puente Valley CWD and Covina Valley Water Company - Wholesale and Metropolitan Water Dist. of So. Cal. and Valley County Water Dist. and Walnut Valley Water District, which supplies Suburban Water Systems-San Jose; California Water Board lab results (2023–2026).
- Suburban Water Systems-San Jose and La Puente Valley CWD add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies La Puente, CA
Suburban Water Systems-San Jose
Serves 49% of residents · Buys water from Pomona - City, Water Dept. · Chloramine
La Puente Valley CWD
Serves 22% of residents · Groundwater (wells) · Chlorine
San Gabriel Valley Water Co.-El Monte
Serves 19% of residents · Groundwater (wells) · 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.