Triclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acid, and its ethylene glycol butyl ether ester (EGBE), equivalent to 3.5 mg of the acid, were applied, separately, to the top layers of columns (40 cm X 8.9 cm i.d.) packed with a loam soil or with quartz sand. Water, equivalent to 2.5 cm of precipitation, was leached through each column every second day. After 54 days, residues were found only in the top 10-cm layers of the soils; they were triclopyr and the metabolites 3,5,6-trichloro-2-pyridinol (TP) and 2methoxy-3,5,6-trichloropyridine, accounting for about 5, 85, and 10%, respectively, of the total of the residues which, in turn, was equivalent to 65% of the amount applied initially to the top layers. No residues were detected in the lower soil layers or the eluates. Triclopyr-treated sand: Found were 10 and 65%, respectively, in the sand and the eluates after 54 days. EGBE-treated sand: All residues were in the eluates after only 34 days. All residues from sand and eluates were in the form of triclopyr, except a few eluates from the latter treatment with traces of EGBE or TP.