Environmental groups have blamed Tyson for polluting the Illinois River with poultry litter, though a company spokesperson said the litter belongs to independent contract famers and not to Tyson. To address the problem of poultry litter in watersheds, Tyson and four other poultry companies formed the non-profit organization BMPs in 2004. Tyson says that the organization has helped to move more than 1 million tons of poultry litter out of the Illinois River watershed, redistributing the litter to less nutrient-dense areas.