Philadelphia International Airport stormwater management and permitting

Philadelphia International Airport (PHL) operates under NPDES stormwater permits and maintains a Stormwater Pollution Prevention Plan that documents stormwater controls such as detention basins, oil/water separators, and other best management practices to limit pollutants entering storm drains and nearby waterways. Airport environmental compliance reports and permit filings describe these measures and monitoring requirements. The airport's stormwater systems are designed to manage runoff from extensive pavement areas and aircraft operations.