Covina, CA tap water

Supplied mostly by Covina-City, Water Dept., plus 4 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 about 0.21 ppm of ammonia here. Some utilities switch to plain chlorine for a few weeks a year.

Safety for fish and shrimp

Ammonia (with conditioner)

Estimate

0.07–0.32 ppm (Low)

Typical 0.21 ppm

This is what a conditioner frees when it breaks the chloramine apart. A cycled filter clears it within a day.

Estimated from the chloramine level Azusa Light & Water reports (2024).

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)

Supplier's figure

Up to 26 ppm (Worth knowing)

Typical 12 ppm

Water changes can't take your tank's nitrate below this level.

Copper at home taps

Up to 0.86 ppm (Low)

Typical 0.07 ppm

Low. Water that sits in household pipes overnight can carry more than this.

From California Water Board lab results; Azusa Light & Water's 2024 water quality report (2023–2026).

Chlorine or chloramine at the tap

0.3–1.3 ppm

Typical 0.9 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: Azusa Light & Water's 2024 water quality report.

Water chemistry

General hardness

Supplier's figure

85–280 ppm

Typical 109 ppm

Moderately soft to medium. Suits most community fish and plants.

From the utility that supplies yours: Covina Valley Water Company - Wholesale and Three Valleys MWD, which supplies Covina-City, Water Dept.; Azusa Light & Water's 2024 water quality report; California Water Board lab results; Covina Valley Water Company - Wholesale and Three Valleys MWD and Walnut Valley Water District, which supplies Gswc-San Dimas (2023–2026).

Carbonate hardness (alkalinity)

Supplier's figure

72–220 ppm

Typical 97 ppm

Moderate buffering. pH should stay fairly steady.

From the utility that supplies yours: Covina Valley Water Company - Wholesale and Three Valleys MWD, which supplies Covina-City, Water Dept.; California Water Board lab results; Covina Valley Water Company - Wholesale and Three Valleys MWD and Walnut Valley Water District, which supplies Gswc-San Dimas (2023–2026).

Supplier's figure

7.2–8.5

Typical 8.2

Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.

Total dissolved solids

Supplier's figure

160–660 ppm

Typical 238 ppm

A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.

Who supplies Covina, CA

Covina-City, Water Dept.
Serves 50% of residents · Buys water from Covina Valley Water Company - Wholesale · Chloramine
Azusa Light & Water
Serves 23% of residents · Lake or river water · Chloramine
2024 water quality report
Three Valleys MWD
Serves 12% of residents · Lake or river water · Chloramine
Gswc-San Dimas
Serves 6% of residents · Buys water from Covina Valley Water Company - Wholesale · Chloramine
Covina Valley Water Company - Wholesale
Serves 6% 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.

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.

Covina, CA tap water

Safety for fish and shrimp

Water chemistry

Who supplies Covina, CA

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