Opening the public record…
What changed on the sewer bill?
An adopted rate change, a later published schedule and an illustration you can adjust.
How does a 31-cent change per 1,000 gallons affect the sewer charge?
ATH2025-003 Authorization to increase sewer rate per thousand gallons from $8.99 to $9.30 effective April 1, 2025, to be billed on the May 2025 utility bills, and to recognize that Cobb County Water approved a 3.5% increase to the wholesale sewer rate charged to the wholesale customers effective April 1, 2025. Citywide
Read source · page 8 Official record ↗ · Open related decision2026 schedule publishes the $9.30 sewer rate
A later published schedule lists $9.30 per 1,000 gallons, consistent with the 2025 authorization. It does not audit individual bills. The 2025 schedule heading says January 1 while the council action specifies April 1 for the sewer change.
Read source · page 1 Official record ↗
These separately documented events do not establish broader causal impact.
Illustrative sewer volume charge
At 5,000 gallons: $44.95 → $46.50, an increase of $1.55.
This dated rate comparison excludes water, base charges, stormwater, sanitation and other fees.