The Metropolitan Sewer District has approved its forth consecutive 6.5 percent rate increase, adding $2.31 to customers' average monthly bill.
MSD is under a federal mandate to comply with the Environmental Protection Agency and the Clean Water Act and is responsible for nearly $850 million of repairs and upgrades to its sewage system.
Spokesman Steve Tedder said the consent decree plan devised by MSD in 2008 calls for rate increases over the next several years.
