The study aimed to evaluate the effectiveness of constructed wetland systems (CWS) in degrading specific herbicides present in wastewater. To enhance process efficiency, accelerate degradation rates, and reduce the compounds' half-lives in wastewater, a biopreparation was introduced. Conducted on a semi-technical scale, the research compared two CWS systems: one with the biopreparation and one without. The findings demonstrated a high overall efficiency of 96.2%. On the first day, herbicide removal efficiency was 26% in the standard CWS, whereas the system with the biopreparation achieved 41%. By the tenth day, removal efficiency exceeded 90%. The study also determined the DT50 half-life parameters of the herbicides in wastewater and calculated the theoretical time required to reach a concentration of 0.01 mg/dm³. The application of the biopreparation reduced the degradation time of the carbamate herbicide by up to seven days.