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Skip Navigation LinksDNREC : Division of Watershed Stewardship : Watershed Assessment & Management : Chesapeake WIP

Delaware's Chesapeake Bay Watershed Implementation Plan (WIP)

Delaware is among six Chesapeake Bay Watershed states – along with Maryland, Virginia, West Virginia, Pennsylvania, and New York – and the District of Columbia committed to a federal-state initiative to develop a pollution "diet" that will help restore the water quality of the Bay and its tidal waters by 2025.

The Bay and many streams that drain to the Bay from each state suffer from excess pollution and must be cleaned up. The Environmental Protection Agency is leading the effort by developing a Total Maximum Daily Load (TMDL) for nutrients and sediment for the Chesapeake Bay and its tidal branches. A TMDL is the maximum amount of a pollutant that a body of water can receive and still meet water quality standards that protect humans and aquatic life. Delaware has already established State TMDLs for impaired waters in the Chesapeake, but this EPA TMDL will call for additional reductions.

Areas of Delaware (blue portion of state map) within the Chesapeake Bay Watershed - which spans Maryland, Virginia, West Virginia, Pennsylvania, and New York, and the District  of Columbia (as shown on the smaller map).

As part of the TMDL, each jurisdiction is required to develop a Watershed Implementation Plan (WIP) that details how load goals will be achieved and maintained into the future. This work is being done in three phases. Draft Phase I WIPs were due to EPA on September 1, 2010 and final plans were turned in on November 29, 2010. Phase II WIPs in draft and final forms were due to EPA by December 15, 2011 and March 30, 2012, respectively. Drafts and final Phase III WIPs must be received by EPA in February, 2019 and June, 2019, respectively. With each successive WIP, the detail of load goals and actions to achieve those goals will become increasingly more specific. 

Delaware's WIP work is being led by an Interagency Workgroup made up of representatives from DNREC; Delaware Department of Agriculture; Department of Transportation; Office of State Planning Coordination; County Conservation Districts; U.S. Department of Agriculture agencies; U.S. Geological Survey; and other stakeholders such as representatives from the farming and development communities. Nine subcommittees were formed to address: agriculture; stormwater; wastewater; land use and comprehensive plans; restoration; public lands; funding; information technology; and communications. 

WIP Phases

Delaware's Phase I WIP was finalized November 2010 and was used to develop the EPA TMDL that was released December 2010. 

Phase II work occurred in 2011 and early 2012. The Phase II WIP provides additional details about the partner organizations who will implement portions of the WIP, specifies when actions will occur, and identifies the resources necessary for success.  Additionally, some of the implementation goals identified in the Phase I WIP have been parsed down to a smaller scale, such as at the County level.  Finally, the Phase II plan established implemenation goals for 2017, which was when 60 percent of the necessary nitrogen, phosphorus, and sediment goals were to be achieved.

The Chesapeake Bay Program has begun the Mid-point Assessment of the Total Maximum Daily Load (TMDL) established by the US Environmental Protection Agency in 2010, per the Bay Agreement. Schedule for completion of this Assessment and the development of a revised Phase III Watershed Implementation Plan to meet the new requirements that result from this Mid-point Assessment can be found here

More WIP Information



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