July 1, 2026, 5:16 a.m. ET Homeowners are renting out their private pools by the hour using apps like Swimply. Many towns prohibit short-term pool rentals, but the rules can be difficult to enforce. Despite the app providing insurance, lawyers warn homeowners face increased liability risks. Homeowners seeking to make a few extra dollars by renting out their swimming pools by the hour are running into a problem: the rules.