Water falling on Earth does produce sound, but it is often masked or overshadowed by other environmental sounds. When water falls, it creates vibrations and disturbances in the surrounding air, which are perceived as sound waves. However, the sound produced by falling water is relatively quiet compared to other common sounds in our environment, such as traffic noise or people talking.
The reason why the sound of falling water may not be very prominent is that it is typically a low-frequency sound. Human hearing is more sensitive to mid-range frequencies, which is why we tend to notice sounds like speech or music more easily. Additionally, the sound of falling water is often diffused and scattered by the surroundings, such as rocks, vegetation, or the water's own splashes, which further diminishes its audibility.
On the moon, where there is no atmosphere, the absence of air means there is no medium to transmit sound waves. As a result, we wouldn't be able to hear the sound of water falling on the moon. However, if there were water droplets or any other objects impacting a solid surface on the moon, there could be vibrations generated that might be detected by instruments, but they would not be heard in the same way we perceive sound on Earth.