A method for treating waste in a mechanical or mechanical-biological waste treatment plant is provided. Waste is introduced into the waste treatment plant at at least one input point, the waste is homogenized by way of at least one agitator and the consistency of the waste in the waste treatment plant is determined. Water or waste which has a higher water content than the waste in the waste treatment plant is added in one scenario. Water is removed or waste having a lower water content is added in another scenario. Further, the method involves transporting the introduced waste to at least one output point, and removing the waste. The waste treatment plant is subdivided into at least two zones and in each zone the consistency of the waste is regulated separately by the input of waste and/or addition or removal of water.