Certain compounds may also be distributed in the environment to the point at which they become ubiquitous. Such compounds may not be classed as persistent but their environmental levels may be maintained by constant addition, for example, by incomplete removal inwastewater treatment plants and therefore release into rivers and drinking water, or by wash-off into waterways and thus into the aquatic food chain. Their ubiquity can lead to concern that they may enter the food chain at significant concentrations. Possible examples include UV blocking agents, residues of pharmaceutical products [6,7] and residues of bacteriostats such as triclosan and triclocarban [8]. These and other similar classes of chemical have been proposed as ‘emerging contaminants’, reflecting concern about their increasing detection in the environment. Synthetic musk fragrances have been historically used in home cleaning and personal care products. Theyhave been detected in the tissues of freshwater and marine biota [9,10], leading to pressure to limit or end their use in consumer products. For such emerging contaminants, indirect human exposure (in addition to direct exposure during product use) may be linked to the consumption of drinking water, use of potable water in the manufacture of food or dietary exposure via the aquatic food chain (such as the consumption of freshwater and marine fish).