Thank you for your reply, Zigner. My apartment manager and I are confused with the regulations because what we referred to say different things about a sprinkler system and if we can find the present county regulation, he can take appropriate action without any hesitation.
It seems that the state made the major change in 2008 and all cities in the county have adopted it. Then it seems the state made the small change and all cities in the county adopted it in 2010. I found about this small change in the regulation of one of the cities in the county. This 2010 version says if the apartment doesn't have a sprinkler system on the balcony, a propane BBQ grill can't be operated. I found two cities show the summary of the 2010 version regulation on their websites.
However, my city seems not to notice the sprinkler system part change. Someone in the fire department said to my manager they didn't know it.
I contacted two cities which show the summary of the 2010 version regulation on their websites and asked which regulation the city adopted. One of them answered so far. Even though they say a sprinkler system is required to use a propane BBQ grill on their website, they sent me the 2008 regulation which doesn't require a sprinkler system.
I also found the county regulation which says the change was made in 2014 on a website which shows the California laws. However, the regulation on the website is not the official one with the county letterhead.
It is really confusing for us to know how the state, the county and the city regulations work.
I'm very sorry for my lengthy explanation.