The waters of the Spokane River are some of the most toxic in Washington.

Some of the trouble spills out of old mine sites in the river’s headwaters in Idaho’s Silver Valley. But scientists haven’t yet found the source of all the heavy concentrations of flame retardants and long-banned industrial compounds that show up in Spokane River fish.

That could change soon. An additional $1 million could be heading toward the Spokane River in coming years to help government experts trace the source of these chemicals. Gov. Chris Gregoire has included the request in her proposed budget. …

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