Description: These polygon features represent the TMDL projects managed by the Washington State Department of Ecology. The boundaries represent the area where the project applies. TMDL projects are required by the Federal Clean Water Act to identify pollution sources and pollution load reductions needed for water bodies to meet water quality standards. Once a TMDL project has been approved by the U.S. EPA, it enters an implementation phase where both point source and non-point source pollution is reduced through permit limits regulated under the NPDES system and through best management practices for land uses that contribute to non-point source pollution.
This data can be used for mapping and map figure production as well as determining the geographic extent of each project. These map features are representations of each particular project and does not replace the official version of the TMDL report approved by the U.S. EPA. Projects in development are subject to change before the report is finalized.
Service Item Id: 17950d30da7a4cc0bfe610d9663f4b4a
Copyright Text: Dustin Bilhimer, 360-407-6480. WA Department of Ecology, Water Quality Program