Instead of paying a waste disposal fee, how about paying by the bag?

A company that’s already working with New England cities to implement that kind of system is bulking up – and including North Carolina in its growth strategy.

In three years, Raleigh-based WasteZero has raised more than $15 million in equity – and it’s still fundraising, betting big that more municipalities will catch on to the concept.

A January securities filing shows that the company closed on $5.6 million from 11 investors…