Tenant shall pay for all loss, cost, or damage (including plumbing trouble)caused by the willful or irresponsible conduct of Tenant or by a person under Tenant’s direction or control."

I found a leak in my plumbing that has been causing damage under my duplex.

I have also learned to inform tenants upfront about plans to fill other rooms that will cause shared bathrooms.

This will cause a lot of owners to get out of the business and look for cash. 

How can I inform the client that this time and moving forward will be their responsibility, without causing so much backlash?

I'm dealing with a tenant who has caused me several issues in the past.

If they're not causing problems and they pay on time, let it be. 

I'm not sure I would let a one time cost of $65 dollars cause a rift with your relationship with your PM.

I know that somehow they caused the damage but I can’t prove it with video evidence or anything like that.

I would make it unpleasant for someone that overstayed their welcome.I have been doing this for about 10 years and have never had any cause for concern about someone not leaving when they were supposed to.I have a fishing team staying at the house that are in a tournament.