The contract was ratified on Sept. 9 and applies to local members of the American Federation of State, County and Municipal Employees (AFSCME).
The county is in negotiations with several other unions with expired contracts.
Other concessions in the AFSCME contract include higher co-payments and health care premiums and, for new employees, lower retirement and health care benefits and higher contributions to cost-of-living adjustments, the statement said. The same changes apply to the county's management employees.
In a temporary measure to help relieve the burden of these changes, the county will, in 2011 and 2012, contribute $200 per year per employee to their health care flexible spending accounts. Laid-off employees will receive a week's pay for each year of service up to 10 years.