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Costa Rica's current administration said it made the largest investment in a decade in terms of sewerage infrastructure.
The government led by President Luis Guillermo Solis began its term in May 2014.
Sewerage investment grew from 885mn colones (US$1.56mn) in 2007 to 24.9bn in 2015, the year in which the largest investment was made, the government said a press release.
From 2007-2016, authorities invested 78.88bn colones in sewerage projects, of which 50% were carried out between 2015 and 2016.
Approximately 67.6bn colones went to expanding the sewerage system of capital San José's greater metropolitan area.
Around 2.78bn colones were invested in the construction of the sewerage system serving Puerto Viejo and Cocles, in Limón province. And 7.9bn were used to complete minor works.
In the case of water utility AyA, one of the agencies involved in the sanitation efforts, 18 projects were completed in the San José metropolitan area since 2014 at a cost of 2bn colones.
The agency's goal is to invest a total of US$1.45bn through 2020 to improve potable water and sewerage infrastructure.
To date, only 56% of the country's population is connected to the public sewerage system.