There is security, but I'm unsure if they're there overnight. Also, sometimes the homeless people camp or sleep at the station. Don't leave anything at all in view in your car.
I left my car overnight there but on the outside street area while going out of town and my car was fine. I always see alot of law enforcement around as well.
yes overnight parking is allowed at east & west lots 330 spaces & only 14 handicapped spaces.Spots fill quickly, be mindful of your belongings if parking over night. hope this helped
Pomona North parking lot allows overnight parking and it's free. Pomona Downtown requires payment. (According to the Metrolink website: https://metrolinktrains.com/rider-info/general-info/stations/pomona---north/)
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