As a former geologist I have to tell you that in some areas where a home is built on the side of the hill during a heavy rain flooding and landslide may be possible. You would want to know if the hills above and around you home have good drainage and history of landslide/mud slide in that area. You need good ground cover(plants) so they can hold the soil in place. Check with the city or the county and see if they have a copy of any geological report. Make sure you get flood insurance if they cover landslide/mudslide. I recommend a geoloical inspection if you can not find any recent report.
Prodential California Realty