Where the Spokane River’s pollution comes from

Municipal and industrial

Wastewater treatment plants

City of Spokane

Liberty Lake Sewer and Water District

Inland Empire Paper Co.

Kaiser Aluminum

Spokane County (future source, when new wastewater treatment plant is completed)

City of Post Falls

City of Coeur d’Alene

Hayden Area Regional Sewer Board

Nonpoint sources

Septic systems

Stormwater runoff

Agricultural runoff/erosion

Naturally occurring

Spokane/Rathdrum Aquifer

Tributary contributions

What the water quality improvement plan does

More than 90 percent reductions in phosphorus coming from pipes

Estimated 66 percent reduction in average phosphorus that goes to Long Lake from March to October

Incentives to reduce nonpoint sources and to conserve water

Framework for future pollutant trading program

Requirement for Avista Corp. to help increase dissolved oxygen in Long Lake through operations of its hydroelectric dams

Source: Washington Department of Ecology