(

a) Any local agency, whose service area includes a groundwater basin, or a portion of a groundwater basin, that is not subject to groundwater management pursuant to other provisions of law or a court order, judgment, or decree, may, by ordinance, or by resolution if the local agency is not authorized to act by ordinance, adopt and implement a groundwater management plan pursuant to this part within all or a portion of its service area. (

b) Notwithstanding subdivision (a), a local public agency, other than an agency defined in subdivision (

g) of

Section 10752, that provides flood control, groundwater management, or groundwater replenishment, or a local agency formed pursuant to this code for the principal purpose of providing water service that has not yet provided that service, may exercise the authority of this part within a groundwater basin that is located within its boundaries within areas that are either of the following:

(1) Not served by a local agency.

(2) Served by a local agency whose governing body, by a majority vote, declines to exercise the authority of this part and enters into an agreement with the local public agency pursuant to

Section 10750.7 or 10750.8. (

c) Except as provided in subdivision (b), this

chapter does not authorize a local agency to manage groundwater planning within the service area of another local agency. (

d) Except as otherwise provided in this part, the process for developing and adopting a revised groundwater management plan shall be the same as the process for developing and adopting a new groundwater management plan.