Boracay poor sewage and septic system of the island. The conditions of Boracay in 1997 led to the installment of a potable water supply system, a sewage treatment plant and a solid waste disposal system in Boracay which was operated by the Philippine Tourism Authority (PTA). The environmental concerns persisted due to noncompliance of numerous business establishments. Then President Gloria Macapagal Arroyo declared Boracay a Special Tourism Zone in 2005 while in April 2006 she gave the PTA administrative control over the island while mandating the agency to coordinate with the provincial government of Aklan. In 2012, the Philippine Department of
Boracay install an efficient sewerage system. Boracay has experienced abnormally high algae growth since February 2015, due to sewage being dumped into the waters surrounding the islands. In early 2018, 50 to 60 percent of all establishments in Boracay were compliant to the Clean Water Act of 2004 according to the Department of Environment and Natural Resources. Partly because of its wind and weather patterns, tourism in Boracay is at its peak during the "amihan" season (which starts in September or October and ends sometime in May or June). During "amihan", the prevailing wind blows from the east. Boracay's main tourism