Emma Hood Swim Center

The City Council voted unanimously on Tuesday to extend its agreement to jointly use and operate the school district’s high school pools through September 2014 as council members sought to assure Alameda’s swimmers that they’re working to secure a long-term fix for the aging pools.

Fixing Encinal High School’s pools could cost more than $2.1 million, a newly released estimate shows – a bill that’s four times what city staffers thought needed fixes would cost and a few hundred thousand dollars less than building new pools from scratch.

Estimates obtained by the city put the cost of fixes for Encinal’s pools at $500,000 – about a quarter of the school district’s new estimate. But the city’s estimate doesn’t include fixes the school district would need to make the pools comply with county and state regulations, Alameda Unified’s chief business officer, Robert Shemwell, told the Board of Education at a meeting Tuesday night.