EDMONDS (Wash.) -- Storm water runoff is believed to be the cause of pollution that killed about 9,500 young salmon at a hatchery on Willow Creek last week.
Preliminary tests failed to find that any gasoline, chemicals or other illegal dumping might be to blame, said Larry Altose, a spokesman for the state Department of Ecology.
Urban stream experts say it's common for fish kills to occur when a heavy downpour follows a long dry period, which is what happened in the Willow Creek watershed recently.
"There's a lot of rooftops, asphalt and driveways around Willow Creek," Tom Murdoch, executive director of the Everett-based Adopt-A-Stream Foundation, told The Herald of Everett.
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