Based on the context and the answer, generate a question. 

Context: Somebody has to come test the water before you can use it , " she said . I stood in the middle of my brick walkway , staring down at a long list of names and numbers , remembering the cartoon Dad used to quote whenever someone questioned his love of sailing . " A boat is just a hole in the water you pour money into . "

Answer:

To ensure it is safe .



Why does the water need to be tested ?