Watertown, SD tap water
Supplied mostly by Watertown Municipal Utilities, plus 2 other utilities. 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
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From EPA monitoring data (2017–2018).
Nitrate (NO₃)
Up to 9.5 ppm (Low)
Typically not detected
Not detected in testing, so water changes lower your tank's nitrate well.
From EPA monitoring data (2017–2019).
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)
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
pH
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
- Watertown Municipal Utilities adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
- Watertown Municipal Utilities and Clark Rural Water System soften their water at the plant, so it may be softer than the local groundwater.
Who supplies Watertown, SD
Watertown Municipal Utilities
Serves 85% of residents · Groundwater (wells) · Chlorine
Sioux Rural Water System
Serves 6% of residents · Groundwater (wells) · Chlorine
Clark Rural Water System
Serves 6% 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.