Monsey Water Hardness & Quality Report (2026)

Veolia Water New serves Monsey, New York, in Rockland County, providing drinking water to the village and surrounding areas. The supply is a blend drawn from protected upstate Catskill/Delaware watershed reservoirs and the Croton watershed — two major reservoir systems flowing through the Hudson Valley. Treatment occurs at facilities managed by the utility, with water distributed to residential and commercial users throughout the region. The supply blends surface reservoir flows with potential local groundwater components across the Rockland County service area.

The Catskill/Delaware and Croton watersheds source from protected upstate reservoirs underlain by Devonian sedimentary rocks, glacial tills, and limestone outcrops. As water percolates through these formations, calcium and magnesium dissolve into the supply, producing a moderately mineralised character. The Hudson Valley region's karst topography and fractured aquifers further shape water chemistry, blending softer reservoir flows with harder groundwater components drawn from carbonate-rich geology typical of the area, elevating mineral content above pure mountain runoff.

Moderately hard water causes moderate scale buildup in dishwashers, washing machines, and water heaters over time, and showers and faucets may develop spots and film. Regular vinegar descaling, squeegeeing shower walls, and installing low-flow aerators help manage deposits. A water softener is often recommended for households with persistent scaling. Recent reports note 7 contaminants above EPA health-based guidelines and PFAS presence; a certified filter is advisable. Treatment includes filtration, disinfection, and fluoridation to approximately 0.7 mg/L.