North Tonawanda Water Hardness & Quality Report (2026)

City of North Tonawanda Department of Public Works Water Division serves approximately 30,000 residents across Niagara County, including the cities of North Tonawanda and parts of Tonawanda, in a service area spanning the northwest corner of Erie County and the Niagara County border region. The utility draws primarily from the Niagara River, a major transboundary waterway shared with Canada, and treats the supply at the North Tonawanda Water Treatment Plant in the city using coagulation, sedimentation, filtration, and chlorination.

The Niagara River watershed originates from Lake Erie and flows northward to Lake Ontario, traversing the Niagara Escarpment formed primarily from Silurian dolomites and limestones — including the Lockport Dolomite and Rochester Shale — along with Devonian carbonate strata such as the Onondaga Limestone. Glacial till and outwash deposits overlie this Paleozoic bedrock, and natural leaching of calcium and magnesium from limestone aquifers and riverbed sediments produces a moderately mineralised character in the supply.

Moderately hard water leads to moderate scale buildup in water heaters, dishwashers, and coffee makers, reducing efficiency over time. Laundry and dishwashing may require more detergent, and soap scum can form on fixtures. Annual descaling of hot water systems and using high-efficiency detergents helps mitigate these effects. A water softener is recommended for households experiencing noticeable spotting on glassware or dry skin. The water meets EPA standards, though 2–4 contaminants above health guidelines — including potential disinfection byproducts and minor metals — have been reported; residents are advised to use certified filters for added protection.