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The Detroit Water and Sewerage Department (DWSD) is a public utility that provides water and sewerage services for Detroit, Michigan and several additional counties and communities.〔 It is one of the largest water and sewer systems in the United States. In 2000, the utility utilized five water treatment plants using water from the Detroit River and Lake Huron. In mid 2014, DWSD had acquired significant debt and delinquent accounts, and talks of privatization were occurring. ==Overview== The Detroit Water and Sewerage Department is a sprawling network covering 1,079 square-miles,〔〔 servicing more than 40 percent of the U.S. state of Michigan's population,〔 and employing over 3,000 people.〔(The History of Detroit Water and Sewerage Department ). Official website〕 DWSD is one of the most extensive and largest water and sewage systems in the United States.〔 Along with serving the entire city of Detroit, it also serves the counties of Genesee, Oakland, Macomb, Washtenaw, Wayne, St. Clair, Lapeer and Monroe.〔 In 2000, The network comprised 11,000 miles of water mains and a storage capacity of 363 million gallons.〔 In 2000, DWSD provided water for around four million customers in Detroit and its metropolitan area.〔 At this time, the department utilized five water treatment plants that were fed from three raw water intakes, two of which were sourced from the Detroit River and one of which was sourced from Lake Huron.〔 The water treatment plants used the technologies of "pre-chlorination, rapid mix, flocculation, sedimentation, filtration and chlorine disinfection".〔 At this time, the five water treatment plants were Waterworks Park, Springwells, Northeast, Southwest and Lake Huron.〔 In a 1992 survey, "nine of the 119 water purveyors that receive DWSD water indicated that considerable amounts of unlined cast-iron pipe were in place", and that "two-thirds of the eighteen survey respondents also indicated that red/rusty water occurrences were the most common cause of customer complaints".〔 This was associated with the occurrence of iron uptake in the pipes.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Detroit Water and Sewerage Department」の詳細全文を読む スポンサード リンク
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