How the growing “One Water” movement is not only helping the environment but also saving millions of dollars
The Madison Metropolitan Sewerage District in Wisconsin had a problem. Due to tightening state and federal regulations, it had to help decrease the amount of phosphorus in the 540-square-mile (1,400-square-kilometer) Yahara River watershed. It was already removing 95 percent of the phosphorus from its wastewater effluent; new phosphorus level limits would require the equivalent of 96 percent removal.
Source: Ensia