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The western end of the San Fernando Valley has waterfalls throughout Box Canyon, Black Canyon, Chatsworth Lake Manor, Bell Canyon, and Woolsey Canyon. Going further west is Paradise Falls which drops 40 feet into a large pool along the Arroyo Conejo in Thousand Oaks. And the far east of the San Fernando Valley is Trail Canyon Falls.
Trail Canyon has been logged in the World Waterfall Database where it is noted as also "Scoober Falls" but without an explanation. They also note additional Waterfalls which occur within 5 miles of Trail Canyon Falls as Bad Canyon Falls, Fox Creek Falls
Here are the logistics:
Waterfalls & Gorges (U.S. National Park Service) (nps.gov)
How Waterfalls Shape Mountain Rivers | U.S. Geological Survey (usgs.gov)