Armonk, NY tap water
About 36% of Armonk is inside a utility's service area. Homes outside it likely use private wells, which no utility tests.
Disinfectant
Chlorine
Utility water here is treated with chlorine. It slowly gases off from standing water, and any water conditioner removes it. Private wells aren't treated by a utility, so there's no chlorine or chloramine unless a treatment system adds 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 (2012–2019).
Nitrate (NO₃)
0.5–4.3 ppm (Low)
Typical 2.4 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data; North Castle Water District #4, which supplies North Castle Water District #5 (2012–2019).
Water chemistry
General hardness
Area estimate6–362 ppm
Typical 128 ppm
Moderately soft to medium. Suits most community fish and plants.
Area estimate from nearby wells: USGS well samples in your county (2008–2018).
Carbonate hardness (alkalinity)
Area estimate37–465 ppm
Typical 106 ppm
Moderate buffering. pH should stay fairly steady.
Area estimate from nearby wells: USGS well samples in your county (2008–2018).
pH
Area estimate7–8.4
Typical 7.4
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 (2006–2018).
Total dissolved solids
Area estimate40–496 ppm
Typical 188 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 (2006–2018).
Who supplies Armonk, NY
North Castle Water District #4
Serves 25% of residents · Groundwater (wells) · Chlorine
North Castle Water District #5
Serves 15% of residents · Buys water from North Castle Water District #4 · 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.