Shoal & Stem
Tap water lookup

Marietta, GA tap water

Supplied mostly by Marietta Board of Lights and Water, 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

Nitrate (NO₃)

Supplier's figure

1.1–4.9 ppm (Low)

Typical 3 ppm

Low, so water changes lower your tank's nitrate well.

From the utility that supplies yours: Cobb County, which supplies Marietta Board of Lights and Water; Cobb County Water System (CCWS)'s 2024 water quality report.

Chlorine or chloramine at the tap

0–2 ppm

Typical 2 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: Cobb County Water System (CCWS)'s 2024 water quality report.

Water chemistry

General hardness

Supplier's figure

31–33 ppm

Typical 32 ppm

Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.

From the utility that supplies yours: Cobb County, which supplies Marietta Board of Lights and Water; Cobb County Water System (CCWS)'s website.

Carbonate hardness (alkalinity)

Supplier's figure

22–26 ppm

Typical 24 ppm

Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.

From the utility that supplies yours: Cobb County, which supplies Marietta Board of Lights and Water; Cobb County Water System (CCWS)'s website.

pH

Not published yet

We haven't found this number yet. A drop test kit gives you your exact reading.

Who supplies Marietta, GA

  • Marietta Board of Lights and Water

    Serves 76% of residents · Buys water from Cobb Co.-Marietta Water Auth. · Chlorine

  • Cobb County Water System (CCWS)

    Serves 20% of residents · Buys water from Cobb Co.-Marietta Water Auth. · Chlorine

    2024 water quality report

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.

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