Lake Pocotopaug, CT tap water
Supplied mostly by Ctwc - Spice Hill Division, plus 5 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 (2012–2019).
Nitrate (NO₃)
Up to 11 ppm (Low)
Typical 1.8 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data (2012–2019).
Water chemistry
General hardness
Area estimate25–219 ppm
Typical 85 ppm
Moderately soft to medium. Suits most community fish and plants.
Area estimate from nearby wells: USGS well samples in your state (2000–2023).
Carbonate hardness (alkalinity)
69–116 ppm
Typical 69 ppm
Moderate buffering. pH should stay fairly steady.
From EPA monitoring data (2012–2018).
pH
6.7–8.4
Typical 7.6
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2012–2019).
Total dissolved solids
Area estimate57–371 ppm
Typical 163 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 state (2000–2023).
- Ctwc - Baker Hill Division, Aquarion-East Hampton and Ctwc - Westchester East add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Lake Pocotopaug, CT
Ctwc - Spice Hill Division
Serves 22% of residents · Groundwater (wells) · Chlorine
Ctwc - Baker Hill Division
Serves 13% of residents · Groundwater (wells) · Chlorine
Edgemere Condominium Assn., Inc.
Serves 9% of residents · Groundwater (wells) · Disinfectant not listed
Aquarion-East Hampton
Serves 8% of residents · Groundwater (wells) · Chlorine
Ctwc - Westchester East
Serves 7% of residents · Groundwater (wells) · Disinfectant not listed
Mallard Cove Condominium Assn.
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.