Louisville Metropolitan Sewer District rates go up 6.5% starting Wednesday.The increase is to help pay for extensive construction projects mandated by the federal government. The overflow improvement projects are expected to cost around $850-million.MSD Director Bud Schardein says the rate hikes are not related to the economy.“I understand rate increases are tough, and I understand these are tough economic times," says Schardein, "but in essence, we have no choice but to comply and it is the right thing to do for water quality and for the environment.”The average customer’s bill will go up about two dollars per month.MSD has another 6.5% increase planned for next year.