Risks from sediments contaminated with organochlorine pesticides in Hangzhou, China

► The distribution of OCPs in sediments in waterbody in Hangzhou was influenced by total organic carbon. ► (−) Enantiomer of o,p′-DDT and α-HCH was degraded preferentially in sediment samples. ► More ecotoxicological concern should be paid to DDTs, especially p,p′-DDE.