As of 4 a.m. the Contra Costa County Elections Department had not posted the final results.
With all but one of the 154 precincts reporting, voters in the Mount Diablo Unified School District appear to have approved Measure C, which will authorize the district to issue a $348 million bond to help reduce the impacts of state budget cuts and fix and improve school facilities.
The measure required 55 percent voter approval to pass and, according to preliminary election results, it received appears to have received at least 60.7 percent voter approval.
By approving the measure, voters in the district agreed to tax themselves an estimated $40.83 per $100,000 of assessed value of property until the bonds and interest are repaid.
The bond money will be used to improve science, career and technical education facilities, upgrade classroom instructional technology, repair leaking roofs, improve safety, install solar panels and modern air conditioning systems and modernize other school facilities.
Voters in the West Contra Costa County Unified School District also appear to have approved Measure D, which authorizes the district to issue a $380 million bond to improve school safety, repair and upgrade facilities, qualify for state matching grants, remove asbestos, install lighting and security systems, construct new facilities, repair restrooms and increase energy efficiency.
With 126 or 129 precincts reporting, Measure D appears to have received more than 62 percent of the vote. It required 55 percent voter approval to pass.
Property owners in the district will pay an estimated annual tax of $48 per $100,000 of assessed property value until the bonds are paid off.
Voters in the unincorporated El Sobrante and North Arlington neighborhoods appear to have rejected Measure E, which would have funded increased sheriff's patrols in the area.
The measure required two-thirds of the vote to pass, but, with 11 of 12 precincts reporting, it appears to have received just over 45 percent approval.
Voters in Kensington, however, appear to have passed Measure G, agreeing to tax themselves to pay for increased police protection in the Kensington Police Protection and Community Services District.
According to complete unofficial results, voters in the district approved the measure by more than 70 percent.
The new annual tax, which will be $200 for a single-family residential parcel, will be in addition to the existing $300 annual tax.
The new tax will begin July 1 and has no expiration date.
Voters in Brentwood appear to have rejected Measure F, which would have extended the city's urban limit line to make way for a major new development on 740 acres west of the city's current city limits, according to complete unofficial election results.
The measure required a majority vote to pass, but more than 57 percent of voters appear to have rejected it.
Voters appear to have overwhelmingly approved Measure B, which changes change the number of divisions in the Byron Bethany Irrigation District from nine to seven, which will save an estimated $48,000.
The district, which was formed under the California Water Code to provide water service for agricultural, municipal and industrial lands in its boundaries, encompasses parts of Contra Costa, Alameda and San Joaquin counties.