Ridgewood Water Hardness & Quality Report (2026)

Ridgewood, New York — a historic working-class Brooklyn–Queens border neighborhood with a significant German and more recently Latino immigrant community, straddling the Queens–Kings County line — receives its municipal water supply from the New York City Department of Environmental Protection (DEP) Catskill–Delaware and Croton Aqueduct systems, distributed through the Queens borough water distribution network. Ridgewood is served from the Queens side of the distribution system, adjacent to the historic Ridgewood Reservoir (Highland Park). Water hardness in Ridgewood measures 164.5 mg/L — classified as hard, substantially above Manhattan (107.5 mg/L) on the same DEP source.

Ridgewood's elevated hardness compared to Manhattan reflects the Queens–Brooklyn border distribution zone's aged infrastructure. The Ridgewood area is served through the central Queens distribution network — cast-iron mains from the 1900s–1940s era of dense Queens residential development. The historic Ridgewood Reservoir (decommissioned as a water supply in the 1980s, now a wildlife preserve in Highland Park) was once the primary Queens supply reservoir — its replacement by the current Hillview–distribution system introduced longer transmission paths through the aging Queens infrastructure. The dense residential Queens distribution grid with its century-old cast-iron mains accumulates substantial mineral deposits, raising finished hardness well above the Catskill–Delaware source baseline.

At 164.5 mg/L, Ridgewood residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. NYC DEP consistently delivers water meeting all New York State DOH and EPA Safe Drinking Water Act requirements.