Apparently all over?
> CPSC also warns consumers that private storage of more than a limited amount of gasoline (usually five gallons or less) is illegal in many areas, and subsequent fire damage may not be covered by insurance policies.
> CPSC also warns consumers that private storage of more than a limited amount of gasoline (usually five gallons or less) is illegal in many areas, and subsequent fire damage may not be covered by insurance policies.
More recent advice from the API indicates that fire codes usually restrict the storage of more than 25 gallons (~95 L) at home. Many people in rural areas would have orders of magnitude more than that.
So it seems that, in the US at least, it's not illegal all over.
API Source: https://www.api.org/oil-and-natural-gas/consumer-information...
These tanks are outside, though they could start the building near them on fire if something happened.