If, prior to the effective date of the formation of a municipal water district, any territory included therein is annexed to a metropolitan water district organized under the Metropolitan Water District Act, the governing body of the municipal water district, within 90 days after the effective date of the formation of such district, may adopt an ordinance which:
(a)
Recites that the territory has been annexed to the metropolitan water district.
(b)
Refers to the applicable statutes and to the date and place of the filing of the certificate or certificates evidencing such annexation.
(c)
Describes the territory.
(d)
Determines and declares that the territory is excluded from the municipal water district.
Such ordinance shall be effective immediately upon its adoption.