Affordability of water and sanitation services 2015, para. 66
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Increasing block tariffs is a common model for differential pricing in which differing quantities of water (or sewage) are charged at different rates. The first "block" may be set at a "lifeline" tariff - a sufficient quantity for the average household - at a low rate, generally below the cost of providing the service. Once this first "block" has been used, there is an increase in price so that households using water beyond their basic domestic and personal needs will pay comparatively more.
Legal status
Non-negotiated soft law
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Special Rapporteur on the human rights to safe drinking water and sanitation