Does your sump pump plug into a water level float switch, which then plugs into the wall outlet? If so, you could wire a Micro On/Off Module to two line cords, one plugged into the wall outlet (to provide the Micro Module operating power) and the second connecting the Sense terminal to a splitter plugged into the float switch.
Use the INSTEON model 2245 Hub and INSTEON for Hub iPhone app to receive the signal and send iPhone notifications.
I have a similar situation where I want to know when a well pump (110v) is on or off. This information lets me know of a leak or if a hose bibb or other faucet has been turned on long enough for the pump to run and pressurize the pressure tank. Each time the pump runs or cuts off I am sent am sent an email. The device that provides this information is an Insteon Synchronic (2423AS). I have an Insteon On/Off Outdoor Module (2423AS) that powers the SynchroLinc. This arrangement allows me to turn the pump off if I get messages that it is running when it shouldn't be. The program is activated as a part of my security settings using a KPL. This has been a dependable solution that lets me manage the pump from a distance of 325 miles.