The study attempted to facilitate the micropollutants removal evaluation during the ozonation of secondary effluent by developing an index that relates the inactivation of common and worldwide used bacteria as disinfection indicators (total coliforms and Escherichia coli) with the removal of micropollutants. The developed index, named Microlog, was tested in three different WWTP samples as well as compared to literature data. Good correlations were obtained between the numbers of log10 of bacteria removal with a percentage of a specific micropollutant removal, independently of the quality of the effluent. The Microlog concept can be easily used as an additional tool to assess micropollutants removal when ozone disinfection of the effluent was measured.