Table 1.

Nitrosamine contaminants in water.

Nitrosamine	Concentration (ng/L)	Water source	References
Total nitrosamines	60.8	Songhua River, China	[10]
NDMA	4.3 2.2	Raw and finished water, Japan.	[11]
NDMA	180	Water treatment plant, Canada	[12, 13]
NDMA	<2	Wastewater, USA	[14]