The route of triflumuron degradation was investigated in three different soils. The fast dissipation is due to microbial action, which leads up to mineralisation in a significant range. The degradation proceeds via two metabolites, i.e. 2-chlorobenzoic acid (2-CBA), containing the chlorophenyl-ring of the parent and 4-trifluoromethoxyphenyl urea (TMPU), containing the trifluoromethoxyphenyl-moiety of triflumuron. No photochemical degradation is observed. Both metabolites are either mineralised to CO2 or bound to soil (mainly to the fulvic acid and humin fraction). An accumulation potential of triflumuron or its metabolites did not become apparent.