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Six pilot rainwater harvesting systems were installed in five urban, suburban and rural houses, and on a university campus. The systems consist of horizontal gutters to collect roof drainage, and downdrains which end into one or two plastic storage tanks. Devices were also provided to remove first-flush water. Water quality was monitored in the storage tanks and the first-flush devices during the 2-year period from October 2006 to November 2008. Water samples were collected at a frequency of once every 10 days, and analyzed according to potable water specifications to determine major anions (e.g., SO₄^2-, NO₃^-, NO₂^-, F⁻, Cl⁻) and cations (e.g., NH₄⁺, Na⁺, K⁺, Ca²⁺, Mg²⁺), total suspended solids, alkalinity, total phosphorus and microbiological indicators (e.g., total coliforms, Escherichia coli, Streptococcus, Clostridium perfrigens, Pseudomonas syringae and total viable counts at 22°C and 37°C). Furthermore …