If you were going to get your security deposit back you should have had it by now - 10 to 30 days is typical. I suspect that the landlord will not be returning it. Send one more letter, Certified Mail AND 1st class mail. Leave a copy at the Landlord's door as well. Demand return of your deposit within 3 days. If not returned, you should file in small claims court immediately to get it refunded.
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I don't completely understand the question you are asking, but under Pennsylvania law, your landlord must return your security deposit within 30 days from the moment you relinquish control of the rental unit.
If your landlord is complaining that the security deposit is being withheld due to an improper eviction process on your part, then you should contact an attorney immediately to discuss your next move, either through the courts or not.
It sounds to me from the description of the events that your implied warranty of habitability was violated due to the flooding of your bathroom. Under Pennsylvania law, all landlords must provide a safe and sanitary environment to their tenants.
You should contact an attorney immediately to discuss your next move. If you wish, you can contact me for a free initial consultation. Good luck.
Michael Thomas Muha, Esquire
The Law Office of Michael T. Muha, Esquire
Hermitage, PA 16148
Disclaimer: This response does not constitute an attorney-client relationship.