There are 1,300 power plant ash ponds in the country that are generally not regulated, according to a story in the New York Times today. One of 67 ash piles characterized as having contaminated water [right, credit NY Times] is in Arizona.
The Times doesn't list the power plants and ash ponds but based on their map, it appears to be APS' Cholla Power Plant, in St. John [below, credit scenicplaces.com]. The Cholla Bottom Fly Ash Pond is a noted fishing locale.
