New York Harbor is making a comeback and the signs are all around. According to the city's most recent Harbor Survey Report, the Harbor is cleaner now than at any time in the last 100 years. Continued improvements to sewage handling and treatment are chiefly responsible for continued improvements to water quality, which have led to increased recreational opportunities such as swimming and fishing. The New York City Department of Environmental Protection conducts numerous programs designed to maintain this trend. DEP operates 14 sewage treatment plants that together treat around 1.3 billion gallons of sewage each day, and the agency also employs a fleet of boats that are used to monitor the waters and the shoreline for water quality and sources of pollution.