North Spearfish, SD tap water
Supplied mostly by Spearfish, plus 8 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 (2017–2019).
Nitrate (NO₃)
Up to 5 ppm (Low)
Typical 0.6 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data (2015–2019).
Water chemistry
General hardness
Area estimate85–632 ppm
Typical 218 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 (2005).
Carbonate hardness (alkalinity)
Area estimate44–219 ppm
Typical 165 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
Area estimate from nearby wells: USGS well samples in your county (2005).
pH
Area estimate7–7.6
Typical 7.2
Most community fish do well here. Stable water matters more than the exact number.
Area estimate from nearby wells: USGS well samples in your county (2001–2005).
Total dissolved solids
Area estimate85–392 ppm
Typical 111 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 (2005).
Who supplies North Spearfish, SD
Spearfish
Serves 24% of residents · Groundwater (wells) · Chlorine
Lantern Estates
Serves 16% of residents · Groundwater (wells) · Disinfectant not listed
D & E Water Company
Serves 15% of residents · Groundwater (wells) · Chlorine
Ken's Trailer Court
Serves 14% of residents · Groundwater (wells) · Disinfectant not listed
Westfield Addition
Serves 8% of residents · Groundwater (wells) · Disinfectant not listed
Spearfish Valley Mobile Estates
Serves 7% of residents · Groundwater (wells) · Chlorine
Deberg Well Users Association
Serves 7% of residents · Groundwater (wells) · Disinfectant not listed
Lourie Lane Homeowners Assoc
Serves 6% of residents · Groundwater (wells) · Disinfectant not listed
Wild Turkey Estates II
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.