The Summer Sewer Ceiling is the recognition that during summer months, Single Family and Duplex residential customers may use water in areas where that water doesn't enter the wastewater system. Some of these areas include lawns, gardens, and flower beds.
The Ceiling is applied to your usage during the months of May to August and is calculated by adding up your usage from last October through May of the current year (listed on your bill). That total is then 1) divided by 8 months, and 2) rounded up to the next even one thousand (e.g., 4,300 rounds to 5,000). This is the maximum amount of sewer usage you’ll be billed from June thru September.