为节水装置和设备提供经济激励的凭证 电器在加利福尼亚州的圣地亚哥成功使用。原因 成功包括降低参与者的资本支出成本 控制项目运营，以及实现规模经济 计划的规模。圣地亚哥县水务局 优惠券奖励计划为住宅和商业用户提供优惠券- 低冲水马桶（ULFT）、低流量小便器、无水小便器、洗衣机（两者都有） 住宅和投币式）和商业冷却塔电导率 控制器。 包括6篇参考文献。

Vouchers that provide financial incentive for water conserving fixtures and appliances are successfully used in San Diego, California. Reasons for this success include the reduction of capital outlay costs for participants, the ability to control the program operation, as well as achieving economies of scale due to the size of the program. The San Diego County Water Authority's (Authority) Voucher Incentive Program offers vouchers for residential and commercial ultra- low-flush toilets (ULFT), low flow urinals, waterless urinals, clothes washers (both residential and coin operated) and commercial cooling tower conductivity controllers. Includes 6 references.