Cal. Wat. Code § 33139
Notwithstanding anything contained in this part, the surviving district may provide for and carry on the construction, operation, and maintenance of works, improvements, and functions authorized by the Storm Water District Act of 1909 either as authorized in that act or as authorized by this division. The district may raise funds for these purposes in any manner authorized or permitted by either the Storm Water District Act of 1909 or this division, and is specifically authorized to raise funds by special assessment on benefited land in proportion to the benefits derived by the benefited lands pursuant to Section 53753 of the Government Code, or by adopting fees and charges pursuant to Section 6 of Article XIII D of the California Constitution.
Ca. Water Code § 33139