Maineville, OH tap water
Supplied mostly by Warren County, 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 (2013–2017).
Nitrate (NO₃)
2.1–5.5 ppm (Low)
Typical 2.5 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data; Cincinnati Public Water System, which supplies Western Water Company (2012–2025).
Water chemistry
General hardness
Supplier's figure126–140 ppm
Typical 126 ppm
Moderately soft to medium. Suits most community fish and plants.
From the utility that supplies yours: Cincinnati Public Water System, which supplies Western Water Company (2025).
Carbonate hardness (alkalinity)
Supplier's figure74 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: Cincinnati Public Water System, which supplies Western Water Company (2018).
pH
Supplier's figure8.9
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From the utility that supplies yours: Cincinnati Public Water System, which supplies Western Water Company (2018).
- Warren County and Western Water Company add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
- Warren County and Western Water Company soften their water at the plant, so it may be softer than the local groundwater.
Who supplies Maineville, OH
Warren County
Serves 59% of residents · Groundwater (wells) · Chlorine
Western Water Company
Serves 8% of residents · Buys water from Cincinnati Public Water System · 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.