First check your basement or crawl space below the spot where you hear the water sound.
Dripping sound under floor.
I crawled under the house where i can eyeball the toilet drain pipe.
Be sure to especially check the kitchen as there are many water sources and water pipes in that room.
I just moved into a 4 yr old house.
Gramp ca after flushing an upstairs toilet i can hear a dripping sound in the first floor room underneath that bathroom.
Fortunately not every water sound signals a problem sometimes the water is safely inside pipes.
From there i can hear the dripping but can see no water leaking anywhere.
Before long the vinyl flooring or tiles begin to loosen.
Dripping sound no visible leak worries homeowners real estate matters april 15 2016 we heard from nosy neighbors that they had planned to live there but plans changed so we don t believe it was a quick flip to mask problems.
Although it may sound minor this leak causes major damage when water seeps into the subfloor where flooring meets the tub or shower.
The drip drip drip goes on for maybe an hour.
After shutting off the water on the second floor the sound finally tapers off after 5 10 min.
Listen carefully for this noise because if you detect it it can lead you right to the source of the leak.
Interesting i noticed every time someone is talking shower on the second floor guest bath right below it on the first floor i could hear dripping or ticking sound.
A water leak inside a wall can destroy wallboard and insulation and lead to mold or mildew problems.
Leaking pipes often project a strange hollow hissing sound.