Another mysterious plumbing noise question

[kylebellamy]

Recently, my ground floor toilet has been making a periodic noise that sounds a lot like a pump is rapidly pumping water into the tank in little squirts. It is always the same length of time, about 15 seconds.

The toilet is on the ground floor near the line in pipes and I can hear the noise there as well.

It's not a hammer sound or anything remotely moaning or hissing. Literally a squirt, squirt, squirt, squirt about 2 a second, very precise. Like a pump somewhere outside the house system is running on and off at irregular times.

Any thoughts? Should I drain the house or something else as a test?

 

[ShaunCorbs]

Sounds like the fill valve is at fault I would replace the fill

 

[kylebellamy]

Sounds like the fill valve is at fault I would replace the fill

Ah, I didn't think of that! Will try it and report back.

Thank you!