Keeping the swimming pool in operation at Barton Community College is likely to require an increase in the mill levy, but it won’t be the only reason for a possible increase, college trustees said Wednesday.Trustees and administrators have talked about budget shortfalls for months, and have sought to maintain the tax rate through budget trimming, dipping into cash reserves and raising tuition rates. On Wednesday, Chairman Mike Johnson said maintaining the pool might require another .81 mills next year, and .19 mills in subsequent years.“Quite honestly, this depends on the price of crude oil,” Johnson said, noting lower valuations will affect the mill levy.Trustee Mike Minton said it isn’t just the pool. “We’re also looking at a potential mill levy increase,” he said.Johnson said that was correct. (Today’s story about the BCC swimming pool describes some budget concerns.)Barton President Dr. Carl Heilman said the board hasn’t purposefully raised the mill levy since 2008.