Sometimes Two Part Increasing Block Tariff are also called ''lifeline tariffs'' or ''social block tariffs'' because they aim to address the needs of the poor by providing a basic level of consumption either for free or at very low cost, with a form of block tariff for consumption above the lifeline level. A further refinement can be to provide a basic amount of water (e.g. 20 m<sup>3</sup> per household per month) free of charge, and introduce the volumetric rate for amounts exceeding this (Winpenny, 2011).
* '''Decreasing Block Tariff'''; Consumers consumers are charged a higher cost per unit of water at lower consumption levels. As the consumption level increases, the price per unit decreases.
* '''Output-Based Tariff'''; users pay in exchange for improved service and based on a schedule of improvements promised by the water or sanitation supplier.
* '''Seasonal or zonal tariff'''; tariffs are dependent on seasons or areas where water availability varies or in areas which are not easily reachable by the service provider.
* '''Pay per use and subscriptions'''; For for public toilets or communal sanitation blocks (i.e. toilet, shower and laundry facilities), users can be charged per visit (pay-and-use) or through household subscriptions for unrestricted use, or an agreed number of visits over an agreed period of time, per adult user or for the whole family. (Sijbesma, 2011)
Where wastewater services (e.g. sewerage, wastewater treatment and/or removal of sludge) are provided their costs are normally recovered through a surcharge on the tariff for drinking water. This is partly because the volume of wastewater is highly correlated with the use of clean water, and partly because of consumer resistance to paying for wastewater services separately (Winpenny, 2011).
