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Source: Metcalf and Eddy, Inc., 1991, Wastewater engineering, 3d ed. (New York: McGraw-Hill, Inc.). Note: aLevel 1 uses retrofit devices such as flow restrictors and toilet dams. Level 2 uses water-conserving devices and appliances such as low-flush toilets and low-water-use washing machines.

Source: Metcalf and Eddy, Inc., 1991, Wastewater engineering, 3d ed. (New York: McGraw-Hill, Inc.). Note: aLevel 1 uses retrofit devices such as flow restrictors and toilet dams. Level 2 uses water-conserving devices and appliances such as low-flush toilets and low-water-use washing machines.

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