Fish and Game Code § 5500

It is unlawful to use explosives in the waters of the state inhabited by fish, except in one of the following circumstances:

(a) Pursuant to a permit first obtained by the user from the department, consistent with terms and conditions set by the commission. The department’s decision to grant or deny a permit may be appealed to the commission by any person.

(b) In an emergency, to remove an accidental obstruction to the flow of water.