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Rate Calculator (Residential Service)

Water Bill Frequently Asked Questions

I only use my irrigation system 3 days a week. How much water can it use?
Having an automated irrigation system can add up fast. Running a system with 4 zones 5 spray-heads per zone, for just 20 minutes three times a week, can add 24,000 gallons of water to a typical bill.

I only have a small leak how much water can it waste?
Leaks add up. A small leak, losing a ¼ gallon of water a minute, can add 10,000 gallons of water to a typical bill. Leaks worsen over time and the water loss increases. Even small leaks left unrepaired can damage your property.

It is only my toilet. It can't use that much water.
For more information and tips on how to be more water efficient or how to detect a water leak in your home, please visit our Water Efficiency subsite.

Why are street light charges on my water bill?
When the program began for streetlight service, there was no billing system in place. Utilizing the Cobb County Water System’s existing billing system proved to be cost-effective; whereas, creating a separate street light billing system would have significantly added costs. The street light fees go to the County’s Streetlight Program fund to pay for utility costs and other maintenance associated with providing this service. For street light repairs/outages, please use the online form, or contact your power company at one of the numbers listed below:

Cobb EMC: 770-429-3432
Marietta Power: 770-794-5125
Georgia Power: 1-888-660-5890
Greystone: 770-942-6576


While we provide this calculator to help our customers get an idea of how much they would incur on water bills based on the amount of water consumed, note that it calculates an approximate charge only.  This calculator is formatted with the standard 5/8 & 3/4 meter rate and base charge.  Customers should call our Call Center at 770-419-6200 to get an accurate charge on their accounts.