The Bureau of Environmental Sciences and Engineering (ESE) is a team of over 100 professionals committed to reducing environmental and engineered hazards in NYC. We oversee water systems in both natural and built environments, as well as radiological materials and equipment. The Office of Public Health Engineering (PHE) promotes water safety and prevention of waterborne diseases by monitoring NYC drinking water supply treatment and distribution, recreational water facilities (beaches, pools and spas), nonpotable water reuse, and stormwater and sanitary sewage discharges.