A method for determining a leak in a line for fluid media can include providing at least one noise and/or frequency logger comprising a sensor, and a computing unit, attaching the noise and/or frequency logger to the line or to fittings thereof, measuring noise on the line via the sensor and determining a noise level by means of a frequency analysis of the noise level. The determined frequency spectrum may be divided into two or more frequency bands, and a threshold value may be determined for each frequency band. A threshold value can be determined for each frequency band, and compared the measured noise to determined if one or more threshold values are being exceeded. A leak in the line can be thus be determined and/or analyzed by means of the computing unit.