Electrical transformers, like any other type of electrical device, must be disposed of in the correct manner or it will present a hazard to the environment. Finding out and following the proper steps for disposing a transformer will prevent harmful chemicals from getting into the ground and relieve crowded dumps. This process is commonly known as "recycling." Many different items are recycled according to their potential use and the actual composition of components. There are rules that guide the recycling of electrical devices as well.
Determine if the transformer is in working condition before recycling, as you may be able to donate the appliance. If it is not working then you can contact the transformer manufacturer. They may be able to provide details on specifically how to recycle the transformer. The manufacturer may even allow you to send the transformer back to them. Some companies send boxes or shipping labels to you so that you can recycle the item by sending it back to the them.
Contact the electric utility company that serves your area. Ask about programs which allow you to turn the electrical device in to them. If they do not have such a program, ask about the recycling details concerning transformers.
Find a recycling center in your vicinity that accepts transformers. You can get this information by contacting the sanitation department in your area.