Would you charge tenants for sewer clog?

[Seth Levey]

I know many will say yes, however it's a bit complicated. My lease specifically states that tenants will be responsible for the cost of plumbing charges if due to their negligence. I had a backup in a unit with four girls living there, for the second time. The first time I sent the plumber out to snake the lines and it cleared easily, small bill and I did not charge them. This time, I had a camera clean out to really find out what's going on. The plumber did find feminine products in the clog, but there was also a sagging low point in the line of 30' that probably contributed to the problem. This was an almost $900 bill. Should I charge them the whole amount? Maybe charge them half, with a message that it will be the full charge if it happens again?