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A new study from the EPA says multiple locations in the lower valley had nitrates above ten parts per million, and that's considered unsafe to drink.

The Environmental Protection Agency held a public meeting this week to discuss possible solutions. It's believed at least some of the contamination is coming from dairy farm runoff from 5 different dairies and several farms in the valley. Many dairy farmers say they've been working to resolve the issue for years. They've been taking steps like using less manure as crop fertilizer because it can contaminate water sources.

"I believe all the dairy men are doing their best. They're all interested in clean water. They drink the same water the citizens drink," said Tony Viega, who is member of the Washington State Dairy Federation.

Both the EPA and the dairy farmers agree, a comprehensive solution is still years away.