If the regional district is created and established in Los Angeles County, officers and employees of the County of Los Angeles may act, ex officio, as officers and employees of the regional district and may discharge the authority and responsibility specified in this article. The County of Los Angeles may provide the services and facilities needed to carry out the functions of the regional district. Proceeds of assessments levied pursuant to Section 5539.9 may be used to reimburse the county for the actual costs of these services and facilities.