底特律水和污水处理部门（DWSD）在底特律河和休伦湖有三个饮用水取水口。这两个来源都是大湖系统的一部分，与加拿大共享。该系统有五座水厂，平均每天向密歇根州东南部约400万人供应7亿加仑（MGD）的水。作为其50年总体规划的一部分，水利部正在制定一项水源保护计划（SWPP），以更好地监督其大型复杂流域的水质。水源水评估计划（SWAP）已经完成，并提供了对SWPP开发有用的背景信息。DWSD对全国其他SWPP活动进行的研究提供了更多背景信息。SWPP正处于开发的初始阶段，这里总结了其主要组成部分和问题。 包括数字。

Detroit Water and Sewerage Department (DWSD) has three drinking water intakes in the Detroit River and in Lake Huron. Both sources are part of the Great Lakes system and are shared with Canada. The system has five water plants and supplies an average of 700 million gallons per day (MGD) of water to about 4 million people in Southeast Michigan. DWSD is developing a source water protection program (SWPP), as part of its 50-year master plan, to better oversee the water quality of its large and complex watershed area. The source water assessment program (SWAP) has been completed, and provides background information useful in the development of a SWPP. Additional background information has been provided through research conducted by DWSD on other SWPP activities throughout the country. The SWPP is in its initial stages of development, and its main components and issues are summarized here. Includes figure.