A report by the Washington Post focusing on a sprawling Colorado dairy raises questions about whether the nation’s regulatory system ensures that products labeled organic are truly organic.

The story, posted Monday, spotlights the High Plains dairy complex in Greeley, home to more than 15,000 cows.

The facility is part of a network of farms that provide milk to Boulder-based Aurora Organic Dairy, which supplies milk and other daily products to large retailers such as Wal-Mart Stores and Costco. The “private label” milk generally is sold under the retail chains’ own brands. For example, Aurora Organic milk is sold at Walmart stores as Great Value and at Costco stores under the Kirkland brand.

The Post says its investigation of High Plains and other dairies “highlights critical weaknesses in the unorthodox inspection system that the [federal] Agriculture Department uses to ensure that ‘organic’ food is really organic.”

Read more at Denver Business Journal.