Watertown, CT tap water
Supplied mostly by Watertown Fire District, plus 1 other utility. 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)
0.2–1.6 ppm (Low)
Typical 1.5 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data; Waterbury Water Department, which supplies Watertown Water & Sewer Authority (2012–2019).
Water chemistry
General hardness
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
Carbonate hardness (alkalinity)
Supplier's figure20–22 ppm
Typical 21 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From the utility that supplies yours: Waterbury Water Department, which supplies Watertown Water & Sewer Authority (2012–2019).
pH
7.1–7.9
Typical 7.2
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2012–2019).
- Watertown Water & Sewer Authority adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Watertown, CT
Watertown Fire District
Serves 88% of residents · Groundwater (wells) · Chlorine
Watertown Water & Sewer Authority
Serves 13% of residents · Buys water from Waterbury Water Department · 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.