A few years back, every house in the north end of Tacoma had infestations of tiny black "sugar ants". No house was spared. Hardware stores couldn't keep ant traps in stock.
Since then it's been an annual thing every spring around here as soon as the weather warms up.
The ONLY thing we found that actually killed the little bastards was this stuff:
https://www.syngentapmp.com/product/optigard-ant-gel-bait-insecticide
