Coventry Lake, CT tap water
About 45% of Coventry Lake 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)
0.2–4 ppm (Low)
Typical 2.4 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data (2012–2019).
Water chemistry
General hardness
Area estimate26–152 ppm
Typical 55 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
Area estimate from nearby wells: USGS well samples in your county (2003–2023).
Carbonate hardness (alkalinity)
64–66 ppm
Typical 65 ppm
Moderate buffering. pH should stay fairly steady.
From EPA monitoring data (2014).
pH
7.1–7.7
Typical 7.3
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2017–2019).
Total dissolved solids
Area estimate55–312 ppm
Typical 108 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 (2003–2023).
Who supplies Coventry Lake, CT
Ctwc - Northern Region-Lakeview Terrace
Serves 22% of residents · Groundwater (wells) · Chlorine
Ctwc - Northern Region-Lakewood
Serves 20% of residents · Groundwater (wells) · Chlorine
Ctwc - South Coventry System
Serves 13% 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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.