Table 2.

Water reuse capacity in typical regions from 2006 to 2017 [6,11].

Country/Region	Water Reuse Volume Estimation (×106 m3·d−1)	Water Reuse Rate *	Year	Reference
U.S.A	13.0	9.7%	2000	[12]
China	5.90	2.9%	2015	[13]
Arab region (Arabian Peninsula)	3.63	23%	2013	[10]
India	3.54	30%	2017	[14]
Europe	2.65	2.4%	2006	[15]
Korea	2.58	13.5%	2014	[16]
Israel	1.1	87%	2016	[17]
Australia	0.8	16.8%	2010	[18]
Mexico	0.67	9.0%	2010	[19]
Japan	0.59	1.5%	2014	[20,21]
Singapore	0.58	40%	2013	[22]
Tunisia	0.4	83%	2006	[23,24]

* water reuse rate is the ratio of reused water volume over the total wastewater collected.