Hmmmm. That is high. Did you get it cut off from the last owner & a reading taken?
The pump isn't a great power draw so I'm unsure if it would be that.
I would hazard a guess that it would be the cooking appliances myself. Maybe too many roasts & fry ups
I would wait for a couple of months & monitor the bill to see if it drops.
I have a energy consumption meter thing you can hook around individual wires to see what each circuit draws. i went thru my house with it & was quite interested in the amount of power different things used.
You may borrow it if you wish to delve deeper.