How badly will one missed payment going to collections hurt my credit score?

Last december I changed power companies, then life drama came (and subsequently went) and I forgot to pay the final bill. I was never notified of the outstanding payment (<$30 )or I would have made good. Now they sent the bill to a collections agency. I will gladly pay the bill, but I want to know how bad this... show more Last december I changed power companies, then life drama came (and subsequently went) and I forgot to pay the final bill. I was never notified of the outstanding payment (<$30 )or I would have made good. Now they sent the bill to a collections agency. I will gladly pay the bill, but I want to know how bad this is going to hurt my credit score .
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