Well, 10 gauge is probably overkill but there's nothing wrong with margin. I am assuming that it's a 2hp motor on the pump. The last version of the NEC I have (not the current one) calls for 12 ampere conductors for a 2hp, single phase, 230 volt AC motor. 12 gauge would have been adequate at 20 amperes but 10 gauge is good for 35 amperes. This neglects any derates for number of conductors in conduit. You'll be fine.

If by chance the pump is a 2 1/2hp pump, the NEC values are 17 amperes for a 3hp so you still have plenty of capacity.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".