Managing Our Water photo identifier

Managing our Water


Ecology publication collections

  • Environmental assessment for watersheds - Washington State's Water Quality Assessment lists the water quality status for a particular location in one of 5 categories recommended by EPA. This Assessment represents the Integrated Report for Sections 303(d) and 305(b) of the Clean Water Act.
  • Publications by Water Resource Inventory Area (WRIA) - Ecology and other state natural resources agencies have divided the state into 62 "Water Resource Inventory Areas" or "WRIAs" to delineate the state's major watersheds.
  • Groundwater - Groundwater largely originates from rain and from melting snow and ice and is the source of water for aquifers, springs, and wells. The upper surface of groundwater saturation is called the water table. Also see Groundwater Toxics
  • Instream Flows - The term "instream flow" is used to identify a specific stream flow (typically measured in cubic feet per second, or cfs) at a specific location for a defined time, and typically following seasonal variations. Instream flows are usually defined as the stream flows needed to protect and preserve instream resources and values, such as fish, wildlife and recreation. Instream flows are most often described and established in a formal legal document, typically an adopted state rule.
  • Water Cleanup Plans (TMDLs) - Water Quality Improvement Projects, or TMDLs (Total Maximum Daily Loads) are the amounts of pollutant loading that a given water body (river, marine water, wetland, stream, or lake) can receive and still meet water quality standards. TMDLs are implemented through Waste Load Allocations, inserted as pollutant limits in permits to point source dischargers, and through Load Allocations and non-regulatory programs for nonpoint sources.
  • See all publications by topic