"This report provides an analysis of water banking legislation, policies, and programs in 12 Western states. A primary purpose of the review is to identify banking programs and structures that promote ... environmental trades." Covers Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Texas, Utah, Washington, and Wyoming. Also provides general information about water banking, including purpose, definitions, and formats (such as groundwater banking). From the Washington State Department of Ecology.