A small water pump on ground level has an inlet pipe down into a well at a

Question:

A small water pump on ground level has an inlet pipe down into a well at a depth H with the water at 100 kPa, 15C. The pump delivers water at 400 kPa to a building. The absolute pressure of the water must be at least twice the saturation pressure to avoid cavitation. What is the maximum depth this setup will allow?