Maine's highest court has denied an appeal by Frye Island aimed at freeing it from a requirement to support education costs in the school district that includes the town it seceded from a decade ago.

The Supreme Judicial Court on Thursday upheld a 2005 state law that exempted municipalities in SAD 6 from a new formula the would allocate school district costs in accordance with the percentage of students from each municipality.

Frye Island, which is located in Sebago Lake and used to be part of Standish, shuts down in the winter and sends no children to SAD 6 schools. Therefore, its costs under the new formula would be zero.

The island town and three of its residents challenged the 2005 law on constitutional grounds.