Section 8 and high utility bills - Should I make them pay overages?

[Justin Case]

I pay w/s/g in this economy and I am on the forth month now with two newer sets of section 8 tenants really high on their w/s/g bills. They are each running $45 over a month. Should I make them pay the difference to enforce it?

The overage is due to them always having extra guests over and them not working being home all day.

I put a lease addendum in that they pay overages but I do not want to piss them off and have them move since there are now some other cheaper rentals in the area. So for they are good tenants and mind their own. (besides getting that pit bull with out asking)