Discharging of swimming pool water must be performed in a manner consistent with best practices as outlined by the Wisconsin Department of Natural Resources (WDNR). The Village does not allow for direct discharge into the storm sewer system or the sanitary sewer system.
The best option is pumping it from your pool onto your lawn at a slow rate to allow for infiltration and aeration to avoid encumbering or overwhelming the storm sewer system or sanitary line.
Here’s some info from WDNR on residential pool water best practices:
DNR Fact Sheets
If it is suspected that any contaminants or non-storm water/non-permitted discharges are entering surface waters or the MS4, the WDNR reporting line is: 1-800-943-0003.