NOVELTY - System, comprises: humidity, pressure and temperature sensors placed in the layer of the solid household wastes; data monitoring and analysis unit; command unit; and water and auxiliary substance supply system, which contains the liquid feeder and the system of pipes, located in the layer of solid household wastes. The humidity, pressure and temperature sensors are connected to the data monitoring and analysis unit having a possibility to send and receive electronic signals, which is connected to the command unit having also a possibility to send and receive electronic signals.    USE - The system is useful for maintenance of optimal anaerobic environment in biogas production (claimed).    DETAILED DESCRIPTION - System comprises: humidity, pressure and temperature sensors placed in the layer of the solid household wastes; data monitoring and analysis unit; command unit; and water and auxiliary substance supply system, which contains the liquid feeder and the system of pipes, located in the layer of solid household wastes. The humidity, pressure and temperature sensors are connected to the data monitoring and analysis unit having a possibility to send and receive electronic signals, which is connected to the command unit having also a possibility to send and receive electronic signals, which, in its turn, is connected to the liquid feeder having a possibility to send and receive electronic signals. The liquid feeder is designed with a possibility, when receiving a command from the command unit, to selectively supply liquid into the system of watering pipes for watering a segment of the solid household waste polygon. The watering pipe system is designed with a possibility to provide uniform watering of a segment of the solid household waste polygon. Each mentioned segment of the waste polygon contains humidity sensors, which are placed at the borders of the segment, at least one temperature sensor and at least one pressure sensor, which are placed in the center of the segment. The position of the humidity sensor is chosen in such a way that the coordinates of the humidity, pressure and temperature sensors would correspond to the existing formula as given in the specification where the reference point is the south-eastern corner of the solid household waste polygon.