[3] The department also operates Burton Chace Park, and monitors raptor and waterbird nesting sites in Marina Del Rey's urban forest; tree trimmers wishing to work in the area must apply for a special permit.

[6] In 1976, Fitzgerald advocated for marine reserves to protect the tide pool ecosystems at Abalone Cove and Vista Sudeste.

[7] Circa 1975, when the city of Los Angeles handed over management of the “lifeguards, maintenance, parking and concessions” at their beaches to the county, the department oversaw 73 mi (117 km) of the 76.5 mi (123.1 km) of beaches in the county, including 38 mi (61 km) miles of “improved beaches.”[8] “The beaches surrounding Santa Monica Bay were visited by more than 42.5 million people in 1987,” according to the department's Lifeguard Division.

[1] “Safety operations on state waters in county territory” are also under the purview of the department.

collaborates with the Department of Public Works in the management of Ballona Creek and watershed, Malibu Lagoon and Oxford Basin.