Gravesend Water Hardness & Quality Report (2026)

Gravesend, a neighborhood in Brooklyn, New York City, is served by the New York City Department of Environmental Protection (DEP). The water supply is sourced from 19 reservoirs and three controlled lakes upstate, primarily the Catskill/Delaware watershed (with the Hillview Reservoir as the terminal point) blended with Croton watershed supplies. Treatment occurs at the Hillview blending chamber and distribution points; no major treatment plants are located in Brooklyn itself. The service area covers all five boroughs including Kings County (Brooklyn), serving over 8 million residents.

The primary Catskill/Delaware watershed spans 2,000 square miles in the Catskill Mountains and Delaware River basin, underlain by ancient Devonian-age shales, sandstones, and siltstones of the Catskill and Hamilton Groups. The Croton system draws from granite, gneiss, and schist of the Reading Prong in the Hudson Highlands (Proterozoic era). These low-carbonate, silica-rich formations release few soluble minerals during infiltration through dense forest soils and fractured bedrock, producing naturally soft water with low dissolved solids; protected lands ensure minimal pollution influence on chemistry.

As soft water, Gravesend's supply causes no scale buildup in pipes, boilers, or fixtures, extending appliance life without maintenance concerns. Dishes rinse cleanly with minimal detergent, and skin and hair feel softer without dryness. No water softener is needed or recommended; soft water reduces soap use significantly and prevents limescale in kettles, coffee makers, and laundry machines. NYC DEP maintains pH around 7.0–8.5 for corrosion control; the system complies with the Lead and Copper Rule via orthopolyphosphate treatment, with no PFAS exceedances in recent reports. Treatment involves chloramine disinfection, UV at select plants, and GAC for taste and odor as needed.