Abstract: A compact waste treatment facility comprises an optional surge basin, an aeration basin, a settling basin, and a digester basin. The basins are interconnected in the order named for therewith providing a sequentially arranged waste treatment facility. Each of the basins is comprised of six integral walls which are substantially equiangularly disposed one to the other so that each basin is hexagonally shaped in plan. Each basin has a wall common with the basin interconnected therewith. Each basin has an assembly for supplying fluid treated therein to the next interconnected basin. An aerator is provided in the aeration basin for causing fluid flow thereabout.