The contamination by organochlorine pesti- cides (OCPs) of water, sediments, rice grains and leaves, and animals of different trophic levels, collected from rice paddies surrounding Bueng Boraphet wetland, cen- tral Thailand, was studied during November 2009 to February 2010. The levels of total dichlorodiphenyltri- chloroethanes (ΣDDT) were too low to be detected in any samples. High levels of total hexachlorocyclohex- anes (ΣHCH) and total aldrins (ΣALD) and low levels of total chlordanes (ΣCHL) were detected in both sed- iments and rice grains. α-HCH, β-HCH, γ-HCH, and aldrin in rice grains exceeded the acceptable limits set by the Ministry of Public Health of Thailand. Rice grains were at high risk of contamination due to the direct spraying of OCPs. Fishes were contaminated with mod- erate levels of aldrin. Continued surveys of pesticide contamination in water, sediments, and organisms of each trophic level are recommended to more effectively monitor and control agricultural pesticide usage around