I lived in a small building along with a French family with 5 children. The amount of trash they had every week was incredible. We had our small trash bag and theirs would be a heap of bags chest high. I sometimes wondered if he was throwing out trash from his business too.

While living there the system changed from paying for a disposal service to pre-buying special bags that cost around 2.50chf per 35L bag. The French family moved back to France within a couple of months.

Did they still have children wearing diapers? If so, that's your answer.

You didn't say where you live, and what kind of waste.

Is your separated into general/food/plastic/cardboard? As often it's the plastic bin that overflow if families are not cooking from ingredients but buying ready made food.

I think the children alone are enough of an explanation…