The city of Los Angeles has a lot of oil under it. The La Brea Tar Pits are a surface manification of the fact and LA did start out as an oil boom town. Most of the producing wells have been closed up, Since nobody wanted to live next to one. (ick spelling bad again) and the government taxed a lot of producers out of business. The environmental laws put a lot more out as well. There are a few well left but good luck in finding them. The companies that own them have erected shells to look like office buildings around them to hide the fact. If you are lucky to buy land in LA county you would be VERY lucky to get the mineral rights for your land. If some of the old wells were opened up again it will go a long way towards reducing the price, I hope.