Cal. Rev. & Tax. Code § 2263.4
Notwithstanding paragraph (2) of Section 2263, the maximum property tax rate which may be levied by, or on behalf of, a harbor district shall be the greater of three cents ($0.03) per one hundred dollars ($100) of assessed valuation or the rate levied by, or on behalf of, the district for either the 1971-1972 or the 1972-1973 fiscal year, at the option of the governing body of the district. If a district operates on a calendar year, the maximum rate which may be levied pursuant to this subdivision shall be the greater of three cents ($0.03) per one hundred dollars ($100) of assessed valuation or that levied in either calendar 1972 or calendar 1973, at the option of the governing body of the district. Beginning in the 1981-82 fiscal year, the maximum property tax rate which may be levied shall be the greater of 75/10,000 of 1 percent of assessed valuation or the rate levied by, or on behalf of, the district for either the 1971-72 or the 1972-73 fiscal year, at the option of the governing body of the district. If a district operates on a calendar year, the maximum rate which may be levied pursuant to this section shall be greater of 75/10,000 of 1 percent of assessed valuation or that levied in either calendar year 1972 or calendar year 1973, at the option of the governing body of the district.
In addition, if the voters of a district, pursuant to provisions of the enabling statute under which the district is organized, have authorized an additional rate, such augmented rate shall be the maximum property tax rate.
Ca. Rev. and Tax. Code § 2263.4