go to google

The wasp sting venom is alkaline, and so can be treated with a mild acid like vinegar to reduce the pain. By contrast the bee sting is acidic. An easy way to remember is that the word 'bee' has fewer letters than wasp, and the word 'acid' has fewer letters than alkali.

A wasp causes a wasp sting

Yes - there are many types of wasps in California including: German yellowjacket, western yellowjacket, California yellowjacket, paper wasp, mud dauber, fig wasp, Western sand wasp, square headed wasp, bee wolf, Pacific burrowing wasp, gall wasp, soldier wasp, club horned wasp, burrowing wasp, blue mud wasp, cutworm wasp, thread-waisted wasp, mason wasp, potter wasp, and pollen wasp. Obviously this is not a complete list - just scratching the surface really - but it does demonstrate that California has plenty of wasps.

well how wasp's com in you're house is that they might squeeze through the window or you might have holes some where in your house and they can get in through there.