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[[File:sust portal icon.png|right|100px|alt=Water4icons.png]] {{#ev:youtube|BV_zTDQ1BTk|200|right|<center>WASH FIETS animation</center>}}

Sustainability is about whether or not WASH services and good hygiene practices continue to work over time. No time limit is set on those continued services and accompanying behaviour changes. In other words, sustainability is about permanent beneficial change in WASH services and hygiene practices. <ref>Richard C Carter, Erik Harvey, Vincent Casey (WaterAid, UK), [http://www.washcost.info/page/1066 User financing of rural handpump water services]. IRC Symposium 2010. Pumps, Pipes and Promises. IRC.</ref>