SEIU Local 1021 represents over 4,000 Alameda County Government workers. These workers are members of three different chapters in Local 1021, all working under the same contract. The Social Services Agency (SSA) Chapter includes mostly members from the former Local 535, as well as some members from former Local 616. All members of the SSA chapter work for that county agency. The Behavioral Health Care Services (BHCS) Chapter includes members who work in the BHCS branch of the Alameda County Health Care Services Agency (HCSA). The ALCO Chapter consists of former Local 616 members who work in all the other departments and agencies of Alameda County, including the other branches of the Health Care Services Agency (except BHCS).

Local 1021 represents the following Bargaining Units in Alameda County: Units 3, 4, 5, 6, 7, 8, 10, 11 and 12.

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