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Water-quality data for Washington

http://waterdata.usgs.gov/wa/nwis/qw

Consistent, historic, and up-to-date water-quality data, such as temperature, specific conductance, pH, nutrients, pesticides, and volatile organic compounds downloadable from the USGS National Water Information System as graphs, tables, or files.

Related topics:
Water quality
States or counties
Washington

Metadata as [FGDC] - [XML] - [ISO]

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