N-tert-Butyl-N-ethylnitrosamine (CAS No: 3398-69-4) is identified as probable carcinogenic agents and thus their concentrations in drinking water and recycled water intended for potable consumption have been regulated by water authorities around the world.
Fujioka, Takahiro, et al. “Effects of Membrane Fouling on N-Nitrosamine Rejection by Nanofiltration and Reverse Osmosis Membranes.” Journal of Membrane Science, vol. 427, Jan. 2013, pp. 311–19, https://doi.org/10.1016/j.memsci.2012.09.055.?