CCMWA provides drinking water on a wholesale basis to its customers, who then sell and deliver it to homeowners and businesses. These customers include:

• Cobb County Water System
• Douglasville/Douglas County Water and Sewer Authority
• City of Marietta
• City of Austell
• City of Smyrna
• Paulding County
• City of Mountain Park
• City of Woodstock

CCMWA also provides water directly to Lockheed Martin Corporation/Dobbins Air Reserve Base on a wholesale basis.

The Quarles WTP withdraws water from the Chattahoochee River. The Wyckoff WTP withdraws water from Allatoona Lake, which is part of the Etowah River Basin. This makes the CCMWA one of the few multi-source water systems in Georgia.

The Wyckoff WTP is permitted to produce a maximum of 86 million gallons per day (MGD), and the Quarles WTPs are permitted to produce 87 MGD for a total maximum system capacity of 173 MGD. 

Most water usage occurs in the early morning between 4 a.m. and 9 a.m. Demand slows during the middle of the day, when most people are at work or school, and increases in the evening between 7 p.m. and 11 p.m. Operations staff monitor demands in real time, and make adjustments to treatment and pumping rates to ensure flows and pressures meet demands. Since electrical costs for pumping is one of the highest components of the cost of water, great effort is placed on pumping more during the off-peak power demand periods to keep electrical costs lower.