The San Simeon wastewater treatment plant (WWTP) was built on the blufftop beachfront near Arroyo del Padre Juan Creek (Creek) in the 1960s. Throughout its operation, the WWTP and larger site have been subject to various coastal hazards that resulted in the District undertaking repair, maintenance, upgrade, and adaptation activities, including the construction of a riprap revetment along the northern and western bluff face in 1983, replacement of the outfall pipeline in 1984, placement of riprap along the banks of the Creek in 1995, and replacement of the pipe support structure over the Creek in 1999, among others.