Marvin, NC tap water
Supplied mostly by Union County Water System, plus 1 other utility. 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
Nitrate (NO₃)
Not detected (Low)
Not detected in testing, so water changes lower your tank's nitrate well.
From EPA monitoring data (2012–2019).
Water chemistry
General hardness
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
Carbonate hardness (alkalinity)
Supplier's figure21 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From the utility that supplies yours: Catawba River Wsp, which supplies Lamplighter South-Danby (2013).
pH
7–7.3
Typical 7.2
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2012–2019).
- Union County Water System and Lamplighter South-Danby add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Marvin, NC
Union County Water System
Serves 71% of residents · Lake or river water · Chloramine
Lamplighter South-Danby
Serves 6% of residents · Buys water from Lancaster County W&SD (SC2920001) · 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.