The treatment of olive oil mill wastewater poses a significant environmental challenge due to its elevated concentration of phenolic compounds, resistant to degradation. This study employs coagulation with the PACTM2 coagulant to treat these effluents. Analytical findings confirm a pH of 5.97, high turbidity at 4845 NTU indicating suspended particles, and a noteworthy polyphenol concentration at 7.006 g/L, signaling the presence of potentially harmful substances. An absorbance of 0.900 at 254 nm suggests that organic substances absorb light at this wavelength, while the measured color at 0.363 nm indicates the presence of colored compounds in the effluent. These parameters underscore the complexity of water pollution from olive oil mills, emphasizing the need for effective intervention. Coagulation with the PACTM2 coagulant proves to be a promising method for treating these effluents. A significant reduction in turbidity, polyphenol concentration, and absorbance at 254 nm is achieved through pH adjustment and appropriate coagulant usage. This suggests that coagulation could be a crucial step in the olive oil mill wastewater treatment process.