The City of Cape Coral operates water and sewer systems for the city. Sewage is collected and highly treated to produce reclaimed water, locally known as "rescued water". Reclaimed water is distributed throughout the city through a dual water pipe system, and used for irrigation. Alternatively, reclaimed water can be discharged into the Caloosahatchee River. The Cape was among the first in Florida to deploy the new 4.9 GHz pre-WiMax wireless channel authorized by the FCC in 2003 for exclusive Public Safety use. The economy in Cape Coral is based on health care services, retail, and real estate/construction. The City's Economic Development Office promotes and incentivizes business relocation to Cape Coral. In 2016 the city's top five employers were the Lee Memorial Hospital, Lee County School System, Publix Supermarkets, City of Cape Coral and Walmart. Cape Coral has continuously expanding public and private school systems with high performance standards. Cape Coral is part of the Lee County School District, which is operated by the Lee County Board of Education. , the Board of Education operated 8 elementary, 6 middle, and 5 high schools in the Cape. There are four public high schools in Cape Coral: Cape Coral High School, built in the late 1970s; Mariner High School, which opened in 1987; Ida S. Baker High School, founded in 2004 and named after one of the early principals of Cape Coral High School, which opened in 2005; and the newest, Island Coast High School, which opened its doors for the 2008–2009 school year. In addition, the City of Cape Coral has created a municipal charter school system consisting of two elementary schools, one middle school, and one high school. The charter schools use the Core Knowledge and Cambridge Curricula. Since the system is public, there is no tuition. The municipal charter schools are available exclusively to children who live in Cape Coral. The main campus of Florida SouthWestern State College is located immediately east of Cape Coral in Fort Myers. The college offers associate and bachelor's degrees, plus technical training in fields such as allied health programs, computer networking & programming, business administration, paralegal, criminal justice and fire science. 2009 enrollment was more than 16,000 students on four campuses. One of Florida's youngest state universities, Florida Gulf Coast University (FGCU), opened in 1997 in nearby Fort Myers and now serves more than 12,000 students. FGCU has established a Cape Coral satellite facility, which provides Cape students with a growing offering of core courses.