NORFOLK — The Environmental Protection Agency says states in the Chesapeake Bay Watershed have collectively fallen behind in implementing efforts to reduce nitrogen pollution in the country’s largest estuary.

The federal agency says that Pennsylvania is mostly to blame because not all of its farms are using the best practices to prevent nitrogen runoff, which often comes from animal waste.

The EPA wants states in the watershed to have implemented 100 percent of a long-term plan by 2025. The agency says the goal of having 60 percent of best practices in place throughout the entire watershed by 2017 will not be met.

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