From http://www.metrokc.gov/kcdot/roads/maintenance/illegaldumping/index.cfm
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Illegal Dumping Hotline
Report illegal dumping
We rely on the public to help us identify illegal dumpsites on the road right-of-way. When you let us know about an illegal dumpsite, we're able to quickly coordinate a clean-up response. Illegal dumpsites can attract rats, are dangerous to children, can pollute our rivers and streams, and may contaminate wells. And if they're not cleaned-up quickly, illegal dumpsites often invite more illegal dumping.
In addition to public health, safety and environmental costs, illegal dumping has financial costs. In 2004, the Road Services Division spent approximately $325,000 in illegal dumping response and clean-up costs.
You can report illegal dumping in King County one of two ways:
Use the online reporting form at http://www.metrokc.gov/dnrp/swd/cleanup/report-dumping.asp, or
Call the 24-hour Illegal Dumping Hotline at 206-296-SITE or toll-free at 1-800-527-6237.