MARTINEZ -- Most of the county-level incumbents standing for re-election in Contra Costa County, including two supervisors, will face no opponent on June 3, according to the county Election Office's tally as of the close of the filing period Friday.

The incumbents running unopposed include:

  • District 1 Supervisor John Gioia, of Richmond.

  • District 4 Supervisor Karen Mitchoff, of Pleasant Hill.

  • District Attorney Mark Peterson.

  • Sheriff-Coroner David Livingston

  • Assessor Gus Kramer.

  • Clerk-Recorder Joe Canciamilla.

  • Treasurer Russell Watts.

    An exception is Auditor-Controller Robert Campbell, who is being challenged by Ayore Riaunda.

    Two candidates, Karen Sakata and Linda Delehunt, are competing to replace County Superintendent of Schools Joe Ovick, who is retiring. Because there is no incumbent in the race, the filing period is extended to Wednesday.

    Several bond and parcel tax measures also are on the ballot in different parts of the county.

  • In the Contra Costa Community College District, a $450 million bond measure would add $13 a year per $100,000 of assessed value to the current $13 assessment, for a total of $26 a year per $100,000 of assessed value. The measure needs 55 percent voter approval to pass.

  • In the West Contra Costa Unified School District, voters will decide on a $270 million school construction bond measure that would add $10 a year in taxes per $100,000 in assessed valuation for property owners initially, rising to a maximum of $36 per $100,000. The measure needs 55 percent voter approval to pass.

  • In the Livermore Valley Joint Unified School District, which includes parts of Alameda and Contra Costa Counties, a proposed parcel tax of $138 a year for seven years requires two-thirds voter approval. It would fund advanced math, science and engineering courses; facilities maintenance; teacher retention; and classroom technology and instructional materials.

  • In San Pablo, voters are being asked to authorize a quarter-cent sales tax hike to fund increased emergency medical services; two-thirds voter approval is required.

  • In Orinda, voters will decide on a $20 million bond measure for repair and maintenance of roads and storm drains. It would cost taxpayers an estimated $16.33 a year per $100,000 of assessed valuation and would require a two-thirds majority to pass.

  • In the Kensington Police Protection and Community Services District, voters are being asked to approve a $2 million bond measure to modernize the Kensington Community Center and make it seismically safe. It requires two-thirds voter approval.