Denver International Airport is investing in sustainability by providing convenient water bottle filling stations on each of the three concourses. There are four stations on each concourse. All of the stations are located in the center of the concourses, in each corner area. Despite the airport's robust recycling programs, waste audits show that the majority of plastic bottles make their way into landfills where they can take hundreds of years to decompose. In the first year of operation, the stations filled the equivalent of 600,000 half-liter plastic bottles, increasing customer convenience while effectively reducing waste at the source.