Cal. Sts. & High. Code § 5836

The title to all property acquired by a maintenance district shall be vested in the county. Upon the dissolution of the district by reason of all of its territory being included within a city, such property shall thereupon become the property of such city, and if all of the district is included within more than one city then such property shall be subject to the disposition of the board of supervisors of the county. Such disposition shall be between the several cities in such manner as to the board seems most just and equitable.