AdvertisementManure, Fertilizer Part Of Chesapeake's ProblemDecember 23, 2009Elizabeth ShogrenfacebookEmailAlthough these cows are milked 400 miles upstream from the Chesapeake Bay, they could be part of the pollution problem that has vexed the nation’s largest estuary for decades. Manure and other pollution from parts of six states and Washington, D.C., all drain into the bay. (NPR)