Harrison Water Hardness & Quality Report (2026)

Harrison, New York is served by the Westchester Joint Water Works, a municipal water utility providing service to communities in Westchester County. The utility draws water from both surface supplies linked to the Hudson River watershed and local groundwater aquifers serving the lower Hudson Valley region. Treatment facilities process this water to meet federal and state drinking water standards before distribution to residential and commercial customers. The service area encompasses Harrison and surrounding municipalities in southern Westchester County.

The Harrison water supply originates from the Hudson River watershed and local groundwater sources overlying Precambrian metamorphic bedrock formations — primarily gneiss and schist — interlayered with Quaternary glacial deposits. These geological formations contain dissolved minerals, particularly calcium and magnesium, which contribute to the moderately hard character of the local water supply. The lower Hudson Valley's geology naturally produces water with moderate mineral content typical of the region.

At moderately hard levels, Harrison residents may notice some spotting on dishes and glassware, mild soap scum buildup on bathroom fixtures, and reduced lather from soaps and detergents. Dishwashers and water heaters may accumulate minor scale deposits over time. Most households do not require water softening, though some residents choose point-of-use treatment for aesthetic preferences. Regular maintenance and use of rinse aids can mitigate visible spotting. Third-party data indicates Harrison's tap water contains at least 4 contaminants above EPA health-based guidelines (MCLGs), including Benzo[a]pyrene and Desethylatrazine; a certified water filter is recommended to reduce exposure to identified contaminants.