Tap water in Musashinoshi - view from elsewhere

According to the updated notice on Musashinoshi website, tap water in Musashinoshi consists of 80% from local underground water and 20% from several filter plants in Tokyo, which includes water from Kanamachi plant. The Kanamachi plant provides only a part of the 20% to Musuashinoshi, so drinking tap water in the city should not be so dangerous. (3/23 Musashinoshi PR)
http://www.city.musashino.lg.jp/cms/news/00/01/65/00016524.html