[20160708]IF10283_恢复切萨皮克湾水质：它所处的位置.pdf

https:/crsreports.congress.gov Updated July 8, 2016Restoring Chesapeake Bays Water Quality: Where It StandsSince 2009, the Chesapeake Bay jurisdictions (New York, Pennsylvania, Delaware, Maryland, Virginia, West Virginia, and the District of Columbia) have made progress in reducing pollutants that impair the quality of Bay waters. However, further reductions are needed in order to reach water quality goals established for the Bay by 2025. Basinwide, nitrogen loadings to Bay waters will need to be reduced an additional 20.4% from levels measured in 2015, phosphorus loadings will need to be reduced an additional 5.8%, and sediment loadings will need to be reduced an additional 8.6% by 2025. Background Despite several decades of activity by governments, the private sector, and the general public, efforts to improve and protect the Chesapeake Bay watershed have been insufficient to meet restoration goals. Although some specific indicators of Bay health have improved slightly or remained steady recently (such as blue crab populations and underwater bay grasses), others remain at low levels of improvement, especially water quality. Scientists conclude that overall, the Bay and its tribu