California Code, Streets and Highways Code - SHC § 8663

The unpaid assessments shall be payable in substantially the manner set forth in subdivision (a) of Section 8680, or in substantially the same manner, but at more frequent intervals, as provided by the legislative body by resolution.  The legislative body may designate an official, including an official other than the county tax collector, or other agent, to collect and maintain records of the collection of the assessments, including a procedure other than through the property tax collection procedure prescribed in this division.  The legislative body may authorize an additional assessment to pay the costs of collection, not to exceed the percentages or amounts set forth in Section 8682, and an additional amount to cover the costs of registration, not to exceed the percentages and amounts set forth in Section 8682.1.  The legislative body may authorize an additional assessment to pay for incidental expenses of the financing.  The assessments and the interest on the assessments for each pay period are payable at the end of the pay period and are delinquent thereafter, and shall bear the same proportionate penalties and interest after delinquency as the assessment installments in the subject proceedings.