Triclosan (TCS) is a synthetic broad spectrum antimicrobial agent that has been added in amounts of personal care products and household products. Its widespread use and resistant to degradation resulted in the inevitably release into aquatic environment and thus its potential toxicity towards aquatic organisms is of concern. To understand the risk associated with TCS in aquatic ecosystems, a min review of available literature on its acute and chronic toxicity towards aquatic organisms was conducted in this study. The acute toxicity data showed that TCS always would not show lethal effects at realistic concentration and the LC50 of TCS towards different trophic species spanned more than six orders of magnitude in concentration. Among the tested organisms, algae are the most sensitive species.