The New Canaan Reservoir, which was acquired by the Second Taxing District Water Department (STDWD) in 1992, is located in New Canaan off of Oenoke Ridge Road and has a storage capacity of 127 million gallons. From 1898 to 1985 the reservoir served as the primary source of supply for the New Canaan Water Company. Water from the reservoir flows through the New Canaan Diversion Line, a 16-inch ductile iron water main, into City Lake. The reservoir was purchased by the STDWD to increase the total watershed supply in order to meet the system demand for water. The diversion line is only open when City Lake falls below 75% capacity, which normally occurs during the hotter months.