One-fifth of Panhandle residents get their drinking water from lakes and streams, where it's exposed to bacteria that could make them sick.
And thousands of those people live in communities with outdated water systems for removing those germs.
Among them are the St. Maries system, which serves 2,800 people; and the Central Shoshone County Water District, with 4,000 customers in Kellogg, Osburn, Wardner and Smelterville.