Single-bounded dichotomous choice questions were asked to derive households’
willingness to pay for possible improvements in water services; the choices included
higher water quality and reliable water pressure. In the choice modeling survey, non-
piped households (i.e. those not connected to central water supplies) were presented
with a series of choice sets, each containing one water project option, defined by water
quality levels and water pressure levels. The results showed that the amount that
households were willing to pay for improved water services was higher than the sum of
their existing water bills plus coping costs (incurred by coping behaviors like collecting,
pumping, treating, storing or purchasing water). The marginal values for the water
quality attribute were much higher than for the water pressure attribute. The welfare
estimates obtained from contingent valuation and choice modeling were fairly similar.