California Code, Government Code - GOV § 57451

(a) If the territory of a dissolved district is located entirely within the incorporated territory of a single city, the city is the successor.

(b) If the territory of a dissolved district is located entirely within the unincorporated territory of a single county, the county is the successor.

(c) If the territory of a dissolved district is located within the incorporated territory of more than one city or the unincorporated territory of more than one county, or any combination of the incorporated or unincorporated territory of two or more such cities and counties, the successor is that city whose incorporated territory or that county whose unincorporated territory shall, upon the effective date of dissolution, contain the greater assessed value of all taxable property within the territory of the dissolved district, as shown on the last equalized assessment roll or rolls of the county or counties.

(d) If the terms and conditions provide that all of the remaining assets of a dissolved district shall be distributed to a single existing district, the single existing district is the successor.

(e) If the terms and conditions provide that all of the remaining assets of a dissolved district shall be distributed to two or more existing districts, the successor is that existing district which, upon the effective date of dissolution, contains the greater assessed value of all taxable property within the territory of the dissolved district, as shown on the last equalized assessment roll or rolls of the county or counties.