Of more general concern, water treatment by chlorination or chloramination of organic nitrogen-containing wastewater can lead to the production of NDMA at potentially harmful levels.[2] Further, NDMA can form or be leached during treatment of water by anion exchange resins.[3] Finally, NDMA is found at low levels in numerous items of human consumption, including cured meat, fish, beer, tobacco smoke[3] and as an impurity in pharmaceuticals.[4] It is, however, unlikely to bioaccumulate.[5]