When we had a "good" friend watching our house up in Idaho. We were doing him a favor letting him stay there.
He never noticed the bathroom toilet running non-stop... for 6 months!!! It had a leak running into the ground.
But you could hear it.
Let's just say he was sleeping in and staying out late a bit too much. Doing some things he shouldn't have.
We received a bill from our water company. Almost $2000.00 for 6 months!!!
They only read the meters every 1/2 year back then.
So when we asked him to just by chance go and look around and listen for any sounds.
WOW, hmm, the toilet had a fricken simple leak that was fixed in a 1/2 hour!
"Oh, wow man that was what that noise was?" You have to imagine someone who is smoking A LOT of pot saying this!
I was so mad. All we asked was for him to watch over the house, for free!
I hope yours is easy to fix and cheap! And not very inconvenient.