Mahopac, NY tap water
Supplied mostly by Mahopac Water Co, plus 2 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
Nitrate (NO₃)
1.3–15 ppm (Worth knowing)
Typical 10 ppm
Water changes can't take your tank's nitrate below this level.
From EPA monitoring data; Westchester County WD #2, which supplies Somers Consolidated Water District #1 (2012–2019).
Water chemistry
General hardness
Supplier's figure17–463 ppm
Typical 32 ppm
Soft. Good for tetras, rasboras and most shrimp. Livebearers, snails and African cichlids prefer harder water.
From the utility that supplies yours: New York City System, which supplies Somers Consolidated Water District #1 (2025).
Carbonate hardness (alkalinity)
Supplier's figure16–72 ppm
Typical 25 ppm
Little buffering. pH can drop quickly between water changes, especially with CO₂ or an older tank.
From the utility that supplies yours: New York City System, which supplies Somers Consolidated Water District #1 (2025).
pH
Supplier's figure6.9–8.1
Typical 7.3
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: New York City System, which supplies Somers Consolidated Water District #1 (2025).
Total dissolved solids
Supplier's figure45–240 ppm
Typical 73 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
From the utility that supplies yours: New York City System, which supplies Somers Consolidated Water District #1 (2025).
- Somers Consolidated Water District #1 adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Mahopac, NY
Mahopac Water Co
Serves 41% of residents · Groundwater (wells) · Chlorine
Chateau Ridge
Serves 9% of residents · Groundwater (wells) · Chlorine
Somers Consolidated Water District #1
Serves 8% of residents · Buys water from Yorktown Consold. Water DIST.#1 · 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.