Hi, i've lived in Golden Valley my entire life and i'm looking into a house myself. To answer your question, floods happen every year during monsoon season. It is unusual however for it to reach any housing up close enough to damage the homes. If you're concerned about this , then make sure you are not surrounded by dirt roads as floods tend to go across them, and it is extremely dangerous to attempt to drive through them. Stay closer to the high way, and check to see if the house is accessible during a flood. Watch out for the Sacramento wash, it is by far the biggest wash in the area and cuts clear through the south side splitting up and joining several smaller washes.