Hopkins, MN tap water
Supplied by Hopkins. Here's what its 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)
Area estimate1–28 ppm (Worth knowing)
Typical 15 ppm
Water changes can't take your tank's nitrate below this level.
Area estimate from nearby wells: USGS well samples in your county (2000–2016).
Water chemistry
General hardness
Area estimate285–690 ppm
Typical 427 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
Area estimate from nearby wells: USGS well samples in your county (2000–2016).
Carbonate hardness (alkalinity)
Area estimate193–386 ppm
Typical 305 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
Area estimate from nearby wells: USGS well samples in your county (2000–2016).
pH
8–8.2
Typical 8
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From EPA monitoring data (2012–2019).
Total dissolved solids
Area estimate362–1070 ppm
Typical 578 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
Area estimate from nearby wells: USGS well samples in your county (2000–2016).
- Hopkins adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Hopkins, MN
Hopkins
Serves all residents · Groundwater (wells) · 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.