Water Quality Assessment (303[d]) & Water Quality Improvement Projects (TMDLs)
Water Quality Assessment (303[d])
Washington State's Water Quality Assessment lists the water quality status for a particular location in one of 5 categories recommended by EPA. The assessment represents the Integrated Report for Sections 303(d) and 305(b) of the Clean Water Act.
Water Quality Improvement Projects (TMDLs)
Water Quality Improvement Projects, or TMDLs (Total Maximum Daily Loads) determine 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. Where water bodies do not meet water quality standards for a particular pollutant, 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, to bring water quality up to standards.
Data Quality Assurance
Information on water quality data assurance - what it is, why it is important, and what the State of Washington is doing to support quality assurance of water quality data.
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