The Cyclopedia of New Zealand [Taranaki, Hawke's Bay & Wellington Provincial Districts]
A gravitation scheme has been satisfactorily installed throughout the borough at a total cost of £60,000. The main source is eighteen miles distant, a dam having been constructed beside the Okehu Stream. Although this is usually sufficient, a subsidiary supply is obtained from Virginia Lake, on St. John's Hill. The water from the latter alone gives a pressure of forty-five to sixty pounds to the square inch in the town mains, and when this is added to the larger supply the pressure rises to 110 to 130 pounds to the square inch.