Production machine activities in the steam generator unit at PT.XYZ, generate noise with noise levels at the boiler machine (98.4 dBA), softener machine (87.1 dBA), and storage tank (85.6 dBA). The value obtained exceeds the threshold value (NAB) of 85 dBA so that it can cause disturbances to workers, one of which is fatigue. The study aims to determine the noise level in the Steam Generator un…