Boulder, MT tap water
Supplied by City of Boulder. Here's what its 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)
Area estimate0.3–15 ppm (Low)
Typical 3.4 ppm
Low, so water changes lower your tank's nitrate well.
Area estimate from nearby wells: USGS well samples in your county (2001–2010).
Water chemistry
General hardness
Area estimate38–306 ppm
Typical 144 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
Area estimate from nearby wells: USGS well samples in your county (2001–2017).
Carbonate hardness (alkalinity)
58–83 ppm
Typical 74 ppm
Moderate buffering. pH should stay fairly steady.
From EPA monitoring data (2015).
pH
Area estimate6.3–8.1
Typical 7.5
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 (2001–2017).
Total dissolved solids
Area estimate49–301 ppm
Typical 124 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 (2001–2017).
- City of Boulder adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Boulder, MT
City of Boulder
Serves 93% 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.