许多保护方法目前正在测试中，但很少有公用事业公司知道保护运动的数量效应。加利福尼亚州奥克斯纳德的一项节水运动被发现减少了超过3%的用水量，足以在一年内自食其力。包括表格，如图所示。

Many conservation methods are currently being tested, but few utilities know the quantitative effects of conservation campaigns. One water conservation campaign in Oxnard, California, was found to reduce water usage by more than 3 percent, enough to pay for itself in one year. Includes tables, figure.