... for most of the interior portions of the United States, sewage overflows can put downstream users at risk The Missouri River, for instance, is the source of drinking water for some of the major ... marine water appears to be increasing, and there is evidence that the rate of infection is proportional to both the amount of time swimmers are exposed and the levels of pollution in the waters ... network in the United States was installed after the Second World War, and pipes installed at the beginning of this wave of installation are now reaching the end of their useful life—a point at which...