After being turned off for 4 days through Hurricane Irene... the pump will trip the breaker whenever we turn it on. The switch is good. We can only assume maybe the water is wet. Any suggestions?

I assume when you say breaker you mean a Ground Fault Circuit Interupter (GFCI) breaker or receptacle. If this is the case then what happens is water can get into devices such as pumps and the water can cause unintended electrical paths from 120VAC nodes to the motor frame which is grounded. The GFCI is designed to detect a nominal 5 mA of current to ground and trip. If the GFCI is tripping I would let the motor dry out for a day (if the weather is dry) and try it again.

If by tripping you mean a standard beaker without a test button is tripping then it is tripping because of high current. If this is the case then it may be a water problem but you are just as likely to have a short in the wiring or the motor. I would try shutting off the safety switch, disconnecting the wires to the motor and wrapping the exposed wires with electrical tape. If you turn the switches on that would normally turn on the pump and the breaker again trips you have a problem in the switches or wires. If the breaker does not trip you have a motor problem. You can try to dry it out but probably it has an internal metalic short. If you have access to the location is you could fix it but if not the motor will need to be replaced. I hope this helps.