The Gulf of Mexico coastal environment (Gulf Coast) stretches over approximately 600,000 square miles across five U.S. states: Texas, Louisiana, Mississippi, Alabama, and Florida. It is home to more than 22 million people and more than 15,000 species of sea life. Efforts are ongoing to restore this environment, which has been damaged by specific events such as the Deepwater Horizon spill and hurricanes as well as by disturbances to wetlands and water quality from human alterations and other impacts. The issue for Congress is the implementation, funding, and performance of congressionally sanctioned restoration efforts for the Gulf Coast. Ongoing Efforts to Restore the Gulf Coast. The Gulf Coast environment has been degraded over time due to, among other things, altered hydrology, loss of barrier islands and coastal wetland habitat, issues associated with low water quality, and other human impacts and natural processes. Preexisting environmental issues throughout the Gulf Coast have been affected and in some cases exacerbated by natural hazards and manmade catastrophes. Among other events, Hurricanes Katrina and Rita caused widespread damage to wetland and coastal areas along the Gulf. A number of federal agencies-the Army Corps of Engineers, the Fish and Wildlife Service, the National Oceanic and Atmospheric Administration, and the Environmental Protection Agency, among others-are engaged in ongoing efforts to restore areas or aspects of the Gulf Coast environments. Significant state and local efforts to restore the Gulf Coast also have been undertaken, in some cases in consultation with the federal government. The Deepwater Horizon oil spill resulted in a new set of restoration efforts and funds. Restoration in Response to Deepwater Horizon. The Deepwater Horizon explosion on April 20, 2010, resulted in an unprecedented discharge of oil in U.S. waters, eventually oiling more than 1,100 miles of U.S. Gulf Coast shoreline. As an identified responsible party, the energy company BP is liable for response (i.e., cleanup) costs, as well as specified economic damages and natural resource damages related to the spill. Efforts to mitigate and recover from the Deepwater Horizon spill have initiated several new processes that are expected to supplement ongoing Gulf Coast restoration work. In particular, three major processes are likely to significantly affect restoration work going forward: first, the dissemination of approximately $5.3 billion in Clean Water Act penalties, as required in the RESTORE Act (P.L. 112-141); second, the dissemination of $2.55 billion in criminal penalties from responsible parties by the nonprofit National Fish and Wildlife Foundation (NFWF), as required under relevant court settlements; and third, the assessment and provision of $8.8 billion in Natural Resources Damage Assessment (NRDA) penalties under the Oil Pollution Act of 1990, as amended (P.L. 101-380). Initial funding under NFWF and NRDA early restoration efforts was first released in 2013 and 2014, respectively, whereas the Treasury Department and Gulf Coast Ecosystem Restoration Council began to release funding for certain planning activities under the RESTORE Act in 2015. Congress may be interested in the effect of the efforts on ongoing Gulf Coast restoration, coordination between the multiple aforementioned processes, and the effectiveness of these efforts going forward. As a result of differences in the origins and implementation of each effort, Congress has varying degrees of oversight and control over the dissemination of funding to restore the Gulf Coast. Restoration of the Gulf Coast is complicated from a congressional perspective because multiple restoration processes are interrelated but occur largely outside of the traditional appropriations process (including funds being used by nonfederal sources).