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Assessment of Nonpoint Pollution in Washington State

Publication number Date Published
14-03-028September 2014
VIEW NOW Assessment of Nonpoint Pollution in Washington State (Number of pages: 126) (Publication Size: 4570KB)

Win Zip format (Publication Size: 126KB)
Note: Spreadsheets for Appendices A and C

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Author(s) Wong, S. and P. Pickett
Description This study researched and documented nonpoint source pollution in Washington State, including the linkage between land uses, human activities, and nonpoint pollution. The study evaluated information produced since 2005, including:
• U.S. Environmental Protection Agency guidance
• Recent research
• Nonpoint pollution reduction targets in Total Maximum Daily Load studies
• Section 319 grants
• Case studies from the Walla Walla, Lower Yakima, Dungeness, and Samish Basins.

The study describes the impacts of different nonpoint pollution sources, including: agriculture; urban and residential areas; hydromodification; marinas and boating; forests; atmospheric deposition; and natural sources. Results show that nonpoint pollution from these sources is widespread in Washington and causes a variety of water pollution problems. Best management practices can help reduce pollution impacts.

Spreadsheet files for Appendices A and C are linked to the report above as zip files.
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Keywords nonpoint source, Section 319, TMDL, pollution
WEB PAGE Models and tools for water quality improvement

Washington's Water Quality Management Plan to Control Nonpoint Sources of Pollution

POSTER: Assessment of Nonpoint Pollution in Washington State