Temple City, CA tap water
Supplied mostly by Sunny Slope Water Co., plus 3 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 EPA monitoring data; California Water Board lab results (2014–2024).
Nitrate (NO₃)
3.6–26 ppm (Worth knowing)
Typical 12 ppm
Water changes can't take your tank's nitrate below this level.
From California Water Board lab results; EPA monitoring data (2012–2026).
Copper at home taps
0.05–0.14 ppm (Low)
Typical 0.06 ppm
Low. Water that sits in household pipes overnight can carry more than this.
From California Water Board lab results (2023–2025).
Water chemistry
General hardness
59–291 ppm
Typical 180 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
From California Water Board lab results, measured before treatment; Metropolitan Water Dist. of So. Cal. and Sierra Madre-City, Water Dept., which supplies Cal/Am Water Company - San Marino (2023–2026).
Carbonate hardness (alkalinity)
68–190 ppm
Typical 170 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From California Water Board lab results; Metropolitan Water Dist. of So. Cal. and Sierra Madre-City, Water Dept., which supplies Cal/Am Water Company - San Marino; California Water Board lab results, measured before treatment (2023–2026).
pH
6.5–8.2
Typical 8
Most community fish do well here. Stable water matters more than the exact number.
From California Water Board lab results, measured before treatment; EPA monitoring data (2014–2026).
Total dissolved solids
180–666 ppm
Typical 350 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; Metropolitan Water Dist. of So. Cal. and Sierra Madre-City, Water Dept., which supplies Cal/Am Water Company - San Marino; California Water Board lab results, measured before treatment (2023–2026).
Who supplies Temple City, CA
Sunny Slope Water Co.
Serves 36% of residents · Groundwater (wells) · Chlorine
Cal/Am Water Company - San Marino
Serves 28% of residents · Buys water from Metropolitan Water Dist. of So. Cal. · Chloramine
Gswc-South Arcadia
Serves 17% of residents · Groundwater (wells) · Chlorine
Cal-Am Water Company - East Pasadena
Serves 9% 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.
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.