Correct

不透水

/ bù tòushuǐ / 
Strokes

Definition

waterproof/watertight/impermeable

Example

As an Adjective

waterproof; watertight; impermeable

1
Bù
不
tòu
透
shuǐcéng
水层

impermeable stratum; impervious bed; confining bed

2
Bù
不
tòu
透
shuǐcāng
水舱

watertight compartment