the different levels of water tariffs across cities figure suggest that there is scope for increasing tariffs and the derived revenue in many municipalities but there is also scope for increasing revenue as well as the incentive effects of water pricing from enhancing billing and collection of water tariffs in water operators collected of the mxn billion billed to their clients conagua c down from a peak of in this means that mxn billion were not collected in ten mexican states water operators collect or above of the amounts billed see figure