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Water Rates & Fees

Water & Sewer Rates

Cobb Water System customers are billed monthly for water and sewer usage. The water meter is read monthly to determine the consumption.

For more detailed information on the current rates and fees, please click here.

Up to a maximum of 10% of the Water System's revenue may be transferred to the County's General Fund. For further information, please visit the What is the County’s policy regarding water fund transfers? | Cobb County Georgia webpage to learn more.

Rate Adjustment Effective January 1, 2022

The Cobb County Water System asked the Board of Commissioners to adopt an adjustment to Water System rates effective January 1, 2022.  The request came during the September 14, 2021, board meeting.  The last rate increase was September 2018.  A rate increase is needed due to reduced revenues and increasing operating expenses and to fund planned infrastructure improvement projects.

In FY20, the Water System’s revenues were $12 million less than FY19 revenues. Through June 2021, our revenues are tracking about the same as they were in FY20, so we are not seeing the recovery in revenue that we had anticipated.   While our revenues declined, our operating expenses increased the past two years primarily due to the following:

  • The cost of water per 1,000 gallons purchased by the Water System increased 4.5% and is anticipated to increase another 2.5% on January 1, 2022. (The Water System purchases drinking water from the Cobb County-Marietta Water Authority and distributes it to our retail customers.)
  • There was a major increase in biosolids disposal costs in FY19, and costs have continued to rise. We paid $3.8 million for biosolids disposal in FY18.  Now we are paying about $9 million per year.  (Biosolids are the solids byproduct of the wastewater treatment process. Currently, we are disposing of biosolids in landfills.) 
  • Costs for chemicals used in the wastewater treatment process have increased about 20%.
  • Costs of water and sewer pipe and other materials increased significantly the past year.

In addition to funding daily operations, the Water System funds capital improvements to our water, sewer, stormwater, and wastewater treatment infrastructure. We anticipate awarding nearly $140 million for capital improvement projects over the next two fiscal years.  A rate adjustment is needed so that we continue to replace aging infrastructure to reduce water outages caused by main breaks and to ensure that our wastewater treatment plants operate properly to treat and clean wastewater before returning it to the Chattahoochee River and Allatoona Lake.

At this time, our average residential customer utilizes about 5,000 gallons of water per month and is charged $49.42 for water and sewer service plus a $7.00 base charge.  This is the lowest rate in the Atlanta Metro area, and it is substantially lower than most other large counties. For the average residential water and sewer customer, the rate adjustment will result in a monthly increase of $5.43.  For customers who use less than 5,000 gallons of water, the increase will be less.  Even with the rate adjustment, our rates will remain the lowest in Metro Atlanta.  Customers will pay about $1.20 for 100 gallons water to be withdrawn from Allatoona Lake or the Chattahoochee River and purified, delivered to their homes, removed once used, treated to a very high standard, and returned to either Allatoona Lake or the Chattahoochee River cleaner than it was when originally withdrawn so it is available for further use and enjoyment.

A comparison of current and proposed water and sewer costs to other utilities in the metro Atlanta area is provided below.

Note: The Cobb rates shown are our Unincorporated Rates, which also fund stormwater services.  The City of Atlanta’s rates are the only other rates depicted that also fund stormwater services. 

Current Water and Sewer Rates
Note:  Rates listed do not include the monthly service charge. The typical monthly service charge for a residential customer is $7.00.
Per thousand gallons
Per thousand gallons
Single Family Residential
TIER 1: 1000-3,000 $3.38 $3.51
TIER 2: 4,000-15,000 $5.22 $5.41
TIER 3: 16,000-29,000 $6.49 $6.73
TIER 4: 30,000-49,000 $7.60 $7.88
TIER 5: 50,000 and above $9.86 $10.22
Non-Residential $5.12 $5.31
Irrigation $9.86 $10.22
Wastewater Fee
Sewer Fee $6.46 $6.70

Water and sewer rates for customers located inside city limits are slightly lower to account for the portion of the
Water System’s revenues that fund stormwater services which do not benefit properties inside city limits.