The ornamental design for container for household waste materials, as shown and described.
FIG. 1 is a full front elevational view, partially in phantom perspective, of container for household waste materials showing our new design, the rear elevational view being the same;
FIG. 2 is a plan view thereof; and,
FIG. 3 is a front elevational view, the rear view being a mirror image thereof.
The broken line showing in the figures is for illustrative purposes only and forms no part of the claimed design.