北马林（加利福尼亚州）水区（NMWD）对随机选择的单户独立住宅客户进行了免费家庭用水审计。所有人都处于用水的上四分位；i、 例如，居民使用的水比服务区的普通单户家庭多41%。在研究期间，由于该地区对干旱的宣传，大多数家庭减少了用水量。出于这个原因，NMWD使用了一个控制组，这样就可以隔离审计项目节省的水。审计包括对用水模式、泄漏识别和维修、低流量淋浴头和马桶水箱排水装置的安装、法律灌溉实践评估和灌溉计划建议的采访，以及免费出版物和宣传品的分发。 审计后，平均年使用量显著下降，样本组约为16%，对照组为11%。这一差异或4.6%（9188加仑）可归因于审计项目。据估计，其中7270加仑被储存在家中。只有1918加仑（不到21%）被计算为在家外被拯救，远远低于NMWD的预期。包括6个参考文献、表格、图表。

The North Marin (Calif.) Water District (NMWD) conducted a free home water audit for randomly selected customers from single-family detached homes. All were in the upper quartile of water use; i.e., residents used about 41 percent more water than was used in the average single-family home in the service area. At the time of study, because of publicity about drought in the region, most households had reduced water consumption. For this reason, NMWD used a control group so it could isolate water saved by the audit program. The audit included an interview about patterns of water use, leak identification and repair, installation of low-flow shower heads and toilet tank displacement devices, evaluation of law irrigation practices and recommendation of an irrigation schedule, and distribution of free publications and promotional items. Average annual use declined significantly after the audit, about 16 percent for the sample group and 11 percent for the control group. The difference, or 4.6 percent (9,188 gal), could be attributed to the audit project. Of this amount, 7,270 gal were estimated as being saved inside the home. Only 1,918 gal (less than 21 percent) were calculated as being saved outside the home, far less than NMWD had expected. Includes 6 references, tables, figures.