How much “contamination” (non-compostable material) is acceptable in the compost bin?
No contamination is acceptable in the Portland Composts! program due to its negative impact on the safety, appearance, and marketability of the finished compost product. The best rule of thumb is this: if you’re not sure an item is compostable, dispose of it as garbage until you can determine that it is, in fact, acceptable. Make every effort to keep plastics, foil, metal, and especially glass out of the green bins.
