Cal. Health & Saf. Code § 6540
The governing board may order the construction of sewers, drains, septic tanks, and sewerage collection, outfall, treatment works and other sanitary disposal systems, and storm water drains and storm water collection, outfall and disposal systems, and appurtenances and appurtenant work in the whole or any portion of any of the streets, highways, or public places either in or out of the district, or in property or in rights of way owned by the district, and acquire property, rights of way, and easements therefor, and may provide that the cost shall be assessed upon the fronting lots and lands or on a special assessment district; provided, that said district shall first obtain the consent to said work and the assumption of jurisdiction thereover from the legislative body having jurisdiction of the territory within which any of the proposed work is to be done; and provided further, that if any of the territory proposed to be assessed shall be outside the boundaries of the district, the consent of the legislative body having jurisdiction over such territory shall be obtained to the formation of the special assessment district.
Ca. Health and Saf. Code § 6540