Water does not have a fixed cost. The cost depends on personal consumption, in line with the principle "whoever pollutes or consumes more, pays more" of the European Directive 2000/60/CE. The water service tariff is made up of fixed charges and unitary charges, established according to consumption levels and differentiated according to the category of user and the number of household members. The fixed charge, on the other hand, is independent of the user's consumption and is expressed in euros per year.