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The State of California maintains a public database enabling you to search for names of registered sex offenders and information about them. You can also search by location, zip code, and some venues where children gather. The Megan's Law database is updated regularly and it is best to check your area every so often for any new offenders. The page has legal disclaimers and information you will need to review and agree to prior to conducting a search.
In addition to the Megan's Law information, the State website offers great advice and tips to parents on helping to prevent our children from becoming victims of sexual assault.
For additional information on how to protect yourself and your family, please link to the California Attorney General page.