friendly city. green city, clean waters involves the installment of various soil-water-plant systems that will filter contaminants out of stormwater, returning some of it to the ground, releasing some to the air, and some slowly back into the sewer system. this process targets impervious city surfaces such as streets and the roofs of buildings. the increased land development leads to more impervious surfaces and causes an increase in stormwater runoff and consequently combined sewer overflows. csos endanger the quality of philadelphia's watersheds because they result in the pollution of rivers and streams. energy efficiency another part of this initiative is to effectively utilize wastewater for energy and nutrients. a philadelphia-based company called novathermal energy partnered with philadelphia water on a project that warms a building with heat derived from sewage. this building is the southeast water pollution control facility in philadelphia. a sewage channel adjacent to the building transfers heat into a 1 million btu/hour unit located in the building's basement. this geothermal system utilizes a water source heat pump complete with a filtration device to transfer heat energy from the sewage channels that are already in the ground, unlike costly geothermal wells which must be dug for a similar heating process. greenstem network the circuit boards that collect the data go on the top floor in the birdhouse while the birds nest in the bottom. the greenstem network is an initiative by philadelphia water to integrate the study of the urban watershed into philadelphia's public schools. using low-cost technologies such as the arduino microcontroller and the raspberry pi, greenstem allows students to monitor schoolyard gardens using web-connected sensors. the project began at techcamp philadelphia in 2013, a hackathon sponsored by the u.s. state department and the school district of philadelphia, as a collaboration between philadelphia water and civic hackers from code for philly. in 2014, greenstem worked with students to design innovative soil-moisture monitoring systems for their school gardens called root kits. students could view soil moisture data online at www.greenstemnetwork.org and determine when gardens needed to be watered. in 2015, students helped build and develop solar-powered birdhouses. in addition to monitoring soil-moisture data, the birdhouses contain an infrared camera that captures live footage of the birds nesting inside. the program also incorporates student visits to the fairmount water works, which provides educational support. students from science leadership academy's beeber campus have engaged in programming root kits for other schools and built birdhouses to hold the soil-moisture sensors and cameras. governance randy e. hayman, water commissioner melissa labuda, deputy water commissioner of finance gerald leatherman, deputy water commissioner of administration and human resources donna schwartz, deputy water commissioner of operations glen abrams deputy commissioner of communications and engagement stephen j. furtek, general manager of planning and engineering marc cammarata, deputy water commissioner of planning & environmental services ji jun, general counsel damien wright, director of innovation and technology statistics general: employees: 1,836 drinking water customers: approximately 1.7 million wastewater customers: approximately 2.2 million service areas: philadelphia water: 130 sq. mi. wholesale water: 101.35+ sq. mi. water treatment, storage and transmission: average daily treated water delivered: approximately 250 million gallons per day (mgd) total raw and treated water storage design capacity: 1,065.5 million gallons (mg) combined rated treatment capacity of three plants: 546 mgd water infrastructure: total water system piping miles: 3,174 main mileage replaced: 16.1 total number of valves: 91,240 total number of fire hydrants: 25,355 wastewater treatment and infrastructure: average daily water sewage treatment: approximately 461 mgd total wastewater service area: philadelphia 134 sq. mi., suburban area 230 sq. mi. total collector system piping: approximately 3,722 miles miles of sanitary sewers – separate: 762 miles of stormwater conduits (sewers): 738 miles of combined sewers: 1,856 miles of force mains, inlets and vent pipes: 368 number of wastewater pumping stations: 16 number of stormwater pumping stations: 3 number of stormwater inlets: 74,430 sewers reconstructed: 6.6 miles