Harrington Park Water Hardness & Quality Report (2026)

Harrington Park, NSW, receives its water from Sydney Water, a major utility serving the expansive Sydney metropolitan area, including the Camden Council region. The supply originates from a network of reservoirs and dams, notably Warragamba Dam, drawing water from the Nepean, Avon, and Warragamba rivers. Treatment is handled at significant facilities, with the Prospect Water Filtration Plant being a key site that processes raw water before it enters the distribution system for millions of residents across Sydney, the Blue Mountains, and the Illawarra. The primary water source is the Warragamba catchment, part of the larger Hawkesbury-Nepean river system.

Geologically, the water supply originates from Triassic period sedimentary rocks, predominantly the Hawkesbury Sandstone and the Narrabeen Group shales. These formations are characterized by quartz-rich sandstones and shales, which contain very few carbonate minerals. Consequently, the water that runs off these landscapes and collects in the reservoirs is naturally soft, as it dissolves minimal calcium and magnesium. Extensive forested areas within the catchment also contribute to the low mineral content found in the water before it reaches Harrington Park.

Because the water is soft, homeowners in Harrington Park will find it gentle on their plumbing and appliances, with little to no limescale buildup expected on fixtures like kettles or showerheads. You'll also notice that soaps and detergents lather more readily, meaning you can use less product. A water softener isn't necessary for this supply, which helps reduce maintenance costs. While generally very pure, Sydney Water adds fluoride for dental health and uses chlorine for disinfection, with E. coli having been detected in some samples, necessitating careful treatment at facilities like ProspectProspect**.