Plastic waste separation is useful to minimize the production number of wastes that will contaminate environment. Waste separation is also needed for recycling needs. This research investigates the household behavior towards the plastic waste separation in Indonesia according to the Norm Activation Model (NAM), Theory of Planned Behavior (TPB), situational factors, and habit. Data were collected using questionnaires and analyzed using SmartPLS. The result of this research shows that the awareness of consequences is positively affect the ascription of responsibility. Both have positive influence on personal norms. Personal norms, attitude, and habit influence the intention and waste separation behavior, whereas the situational factor directly affect plastic waste separation behavior.