Maybe you could get the landlord to reimburse you or go halves on it.

But, I'd also add a clause or addendum they all sign, that says the current tenant and the outgoing tenant are to make arrangements between themselves regarding reimbursing the outgoing tenant any security deposit money.  

If it was damaged, ask him to state it on the bill, then send it to the tenant for reimbursement.   

When they move out , dip the tank figure out how many gallons in the tank , reimburse them for whats there . 

She would normally have to pay the full rent for Aug, then you would reimburse her any overpaid rent after she moved out.  

Wait for the deposit itemization, send a demand letter for what you think he should reimburse you or that you disagree (required by small claims court), then take him to small claims court for the judge to figure out who should pay what.

It's your property and you need to get reimbursed for it.

Check out the lists of reimbursable expenses in Health and Safety 17987.7.

So, you should be reimbursed something for them, plus your labor.So, just CYA with lots of photos and documentation, and be sure and get the itemization to your tenants before the TX deadline for doing so.If you end up sending them a bill for money owed over and above the deposit - what you could end up doing, after they freak out - is offer to settle for "just" the security deposit and let the rest go.  

You'll have to reimburse the housing authority for any overpayment, so you might as well contact them and get that over with.Section 8 money is federal.