Some, however, state whether the wells have pumps, which enables application of the criterion of the necessary effort to obtain water (per the international standard). As in the case of water sources, a usual practice in the evaluation of improved sanitation is consideration of the features of the surroundings. For example, in some rural settings, households, irrespective of their poverty status, would not have access to a sewerage system or to mains water. Households in urban areas are deemed not to suffer deprivation if they have sanitation systems for removal of waste into a sewerage system or a well with a septic tank.