California Code, Health and Safety Code - HSC § 25149.5

(a) A general law city or county may impose and enforce, for revenue purposes, a license tax on the operation of an existing hazardous waste facility; provided that, the license tax imposed shall not exceed 10 percent of the annual gross receipts of the existing hazardous waste disposal facility.

(b) A state agency shall not include the expenditure of revenues received by a city or county pursuant to this section in calculating the level of financial support that a city or county is required to maintain under any other provision of law, including, but not limited to, Section 77204 of the Government Code and Section 16990 of the Welfare and Institutions Code. However, this subdivision does not apply to subdivision (c) of Section 2105 of the Streets and Highways Code.