According to an Orange County Register Article in the United States there are 8,000 cases of venomous snake bites a year with only between 10 - 15 being fatal. Click on the link above, to view the rest of the article it is worth a read. According to the Western Journal of Medicine, rattlesnake bites occur in only one out of 75,000 people per year.
Southern California is known to have an estimated 33 native snake species. Out of these 33 species, only six of the species are venomous.
The Six Venomous Snakes are as Follows:
Red Diamondback Rattlesnake (Hemo Toxic Venom).
Southern Pacific Rattlesnake (Hemo Toxic Venom with some Nero Toxic Properties).
Sidewinder (HemoToxic Venom).
Mojave Green Rattlesnake (Nero Toxic Venom).
Speckled Rattlesnake (Hemo Toxic Venom).
Mojave Green X Southern Pacific Hybrid Rattlesnake (Nero / Hemo Toxic Venom).
Western Diamondback Rattlesnake (Hemo Toxic Venom).
The following local snakes are linked to different sites which will give you photographs of what the species of snake you clicked on looks like. Most of the following links and pictures are from the Western Ecological Research Center.
Common Non-Venomous Coastal Snakes: