Waste Management Inc. is making a public offering of $500 million of 2.90 percent senior notes.

The Houston-based Waste Management said in a news release it plans to use the proceeds to repay the $400 million principal amount plus interest of its outstanding 6.375 percent senior notes when they mature in November.

The company expects the offering to close Sept. 12. It is for notes due Sept. 15. The notes have been assigned ratings of BBB by both Standard & Poor’s and Fitch and Baa3 by Moody’s.