The Subsidy Law No.18.778 established a direct subsidy for drinking water consumption and sewage services to low-income family groups and residential customers. The law set a percentage to be subsided on fixed and variable charges, not less than 25% nor more than 75% of consumption. This subsidy had to be equivalent for beneficiaries of the same geographical region with a similar socioeconomic status. In addition, it established that the subsidy could not exceed a total consumption of 20 m3 per month.
This law also set the terms on how a direct subsidy for the consumption of drinking water and sewerage services is granted to residential users of low-income. This subsidy system is managed by the corresponding municipalities, which in turn are responsible for the registration process and selection of beneficiaries. The municipalities also facilitate water companies with a list of selected users to ensure that the bill clearly and separately reflects the amount to be paid to the water company by users and the amount to be paid by the municipalities. The subsidy is compatible with any other subsidy the beneficiary may have received or be entitled for, in accordance with the attributions set by each municipality. Therefore, the selection system has been established to adapt on specific socio economic situation at municipal level. It constitutes a method of socio economic characterization enabling state social action to be targeted on the poor. It is achieved by the so-called CAS form (Socioeconomic Characterization Survey), now FPS (Social Protection Form). This form enables differentiation among the poorest households by assigning scores. It is designed for an equitable distribution of the various subsidies granted by the Government's social protection network.