The last year approved a rate increase on water and service from the that went into effect with the start of 2012.
The increase of 6 percent for water and 2 percent for waste water actually is less than the county had projected when the commissioners passed a financial Aug. 28, 2007, according to the county's fact sheet on the rate increase.
The increase was supposed to be 8 percent for water and 4 percent for waste water. But the water system's supplier, the Cobb County-Marietta Water Authority, didn't raise its prices as much as expected, and the water system slashed its expenses as part of the county budget cuts last year.
The county answers frequently asked questions about the higher rates on its website.
Sunday also brought a change in the rebate program for toilets that use less water.
The water system is no longer offering a $50 rebate for approved low-flow toilets. Any toilet purchased now must be a a federal Environmental Protection Agency WaterSense-labeled toilet to qualify for a $100 rebate.