Sometimes we have to go against our DP/DHs... We had a leaking shower (its a townhouse and the shower was leaking into the cupboard below) and DP said not to worry it would all be ok... I didn't like the look of the water damage in the cupboard so I went against DP and made contact... and a BIG relief that I did as when it was assessed the guy said that the leak had been there for years and the wood etc in the cupboard was only now showing damage because it was too far gone.

I had all sorts of horrid thoughts of having been standing in the shower when it all went kaputz.

I think you need to ring the landlord - for the safety of everyone I really think it needs to be done.