Do I have increased legal liability if I let my neighbors use my pool when I am not at home?

In addition to the good advice given by other counsel, there is, perhaps a more neighborly approach if you don't mind your neighbors and friends using your pool: a hold harmless and indemnification agreement. This written consent, signed by the neighbors could acknowledge that there are inherent risks of swimming such as drowning, slips and falls, and that pool is private pool without lifeguards, that use by any children will be supervised by adults on the premises at all times, and any and all risks are borne by the neighbors and they will indemnify and hold you harmless for any claims of any nature by them any third party. Also, as other counsel have said, check with your homeowners insurer that pool is covered and in compliance with reasonable safeguards and municipal ordinances regarding locked fences to keep young children out and pool alarms if required. That said, pools are common and with reasonable care they shouldn't be looked at as inherent "attractive nuisances" (trampolines in particular) opening you up to damage claims