Yes, you will be billed for sewer on the water you use to fill your swimming pool. Your sewer bill is determined by the amount of water that you run through your water meter.
The Department of Environmental Conservation law states that pool water is considered contaminated water (gray water). Pool water contains chemicals that should be emptied directly into the sanitary sewer to be treated properly and not emptied into lawns or the storm sewer.
To see how much those charges will be, run your pool measurements through the usage calculator in the Water Division section of this web site.
For more information please contact the Sewer Maintenance Office at 716-661-1652.