You can find the crime reports for most cities in California by looking at http://www.crimereports.com.
The police affiliate themselves with this site, and will post crimes on the site. However, there is NO substitute to simply asking the neighbors in the area about their experiences with crime. While there will always be crime even in the best neighborhoods, the frequency and the level of safety in the area is best described by the residents of the area.
If you get a chance, take a few minutes to talk with the neighbors around the home, and find out about the neighborhood, the crime rate, schools, and what it's like to live there. That will be the best way to get information about the home and the surrounding areas.
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