Flemington, NJ tap water
Supplied mostly by Flemington Water Department, plus 1 other utility. Here's what the water means for your fish.
Disinfectant
Chlorine or chloramine
Utilities here use chlorine or chloramine, depending on which one serves your address. Chlorine slowly gases off from standing water; chloramine doesn't.
Safety for fish and shrimp
Ammonia (with conditioner)
EstimateUp to 0.97 ppm (Low)
Typical 0.29 ppm
This is what a conditioner frees when it breaks the chloramine apart. A cycled filter clears it within a day.
Estimated from the chloramine level NJ American Water - Raritan System reports (2025).
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)
4.2–18 ppm (Low)
Typical 7.5 ppm
Water changes can't take your tank's nitrate below this level.
From EPA monitoring data (2012–2019).
Chlorine or chloramine at the tap
0–4 ppm
Typical 1.2 ppm
At tap levels, chlorine and chloramine are toxic to fish, shrimp and the bacteria in a filter. Water conditioners are made for this range.
Published by your utility: NJ American Water - Raritan System's 2025 water quality report.
Water chemistry
General hardness
90–222 ppm
Typical 156 ppm
Moderately hard. Great for livebearers, and most community fish adapt.
Published by your utility: NJ American Water - Raritan System's website.
Carbonate hardness (alkalinity)
44–180 ppm
Typical 150 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2012–2019).
pH
6.5–8.5
Typical 7.8
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data; NJ American Water - Raritan System's website (2012–2018).
- NJ American Water - Raritan System adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Flemington, NJ
Flemington Water Department
Serves 81% of residents · Groundwater (wells) · Chlorine
- 2025 water quality report
NJ American Water - Raritan System
Serves 19% of residents · Lake or river water · Chloramine
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.