Having secured $635 million in federal loans for Sunnyvale’s 20-year Cleanwater Program, city staff on May 24 took the opportunity to show federal and local environmental officials what they’ve achieved with the funding so far. The low-interest loans are being used to rebuild Sunnyvale’s aging wastewater treatment plant, which was originally built in 1956 and is one of the oldest on the West Coast. … The tour highlighted projects that have received federal funds through the Clean Water State Revolving Fund and the Water Infrastructure Finance and Innovation Act of 2014. Radhika Fox, the Environmental Protection Agency’s assistant administrator for water, said Sunnyvale is a “power user” of federal funding.