Cobb County Government

What We Do

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How we provide you with water

The Cobb County Water System partners with our wholesale provider, the Cobb County-Marietta Water Authority, in distributing clean, safe water to our customers. Cobb County water is obtained from the Chattahoochee River and Lake Allatoona and treated at two plants. The James E. Quarles Treatment Plant located on Lower Roswell Road in Marietta treats water withdrawn from the Chattachoochee River. The Hugh Wyckoff Treatment Plant is located on Mars Hill Road in Acworth and treats Lake Allatoona water. The Cobb County-Marietta Water Authority also maintains nine storage tanks across the county with a combined capacity of approximately 40 million gallons.

The Cobb County-Marietta Water Authority was voted by the U.S. Environmental Protection Agency as the Southeast's "best in water quality control."

How we maintain the environment

Clean water is for everyone. We use it each day in homes, schools, businesses and industry. When it leaves these places it is piped to a water reclamation facility. At the wastewater treatment plant (water reclamation facility), used water, also known as wastewater, must be cleaned and treated before it can be released back into our environment to be used again.

First, sand, dirt and large particles are removed from the incoming wastewater. The second stage is primarily a biological process. Air and special nutrients are supplied to stimulate the growth of bacteria in one or more large basins. These bacteria actually eat most of the waste materials. The wastewater then moves through a series of filters, which remove whatever small particles are remaining. Separated solids are concentrated, de-watered and removed from the process as bio-solids. Bio-solids (sludge) are disposed of either though incineration or haul to a landfill.

In the last process, the treated wastewater receives final disinfecting which kills any remaining micro-organisms. Before the treated water is released into the river or stream, it is de-chlorinated to protect the receiving water.

As a regional system, we provide wastewater treatment directly to our retail customers and through wholesale relationships serving the cities of Marietta, Smyrna, Austell, Powder Springs, portions of Fulton County, the city of Atlanta and Cherokee and Bartow counties.