Voters in Regional School Unit 12 approved the district’s $20.27 million budget in a referendum vote Tuesday.

Of the district’s seven towns, a majority of voters rejected the proposed budget only in Somerville. The unofficial districtwide vote tally was 415-256.

The budget for the Somerville-based school district is about 3 percent greater, or around $600,000, than the budget approved last year. In some towns the shares will increase more dramatically because a cost-sharing formula approved in 2012 is still being phased in.

As a result of the budget and the cost-sharing formula, Somerville’s contribution will increase by 11.5 percent, Windsor’s share will increase by 11.1 percent and Palermo’s share will increase by 8.4 percent. Whitefield’s and Chelsea’s will increase by around 3 percent, Alna’s share will drop by less than 1 percent and Westport Island’s share will drop by around 14 percent.

The budget had been approved at the regional budget meeting May 19, attended by a little more than 60 residents, but not before several attempts at the meeting to lower the budget by around $600,000.

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