The social tariff for water and sanitation is not a new concept in the Brazilian legal system. However, it gained clearer normative contours with the publication of... Law No. 14,898, on June 13, 2024, which consolidated national guidelines for its implementation, expanding the scope of the benefit and reinforcing the logic of protecting low-income families.
For years, although foreseen in the legal framework for sanitation, the social tariff faced practical implementation difficulties. The absence of uniform criteria, regulatory fragmentation, and the lack of clarity regarding economic compensation mechanisms meant that the institution remained, in many cases, more at the normative level than in the concrete execution of contracts.
This scenario began to change with more recent regulatory action. In November 2025, the National Water and Basic Sanitation Agency (ANA) approved a reference standard (ANA Reference Standard No. 13/2025, approved by...). ANA Resolution No. 271/2025This document focuses on the tariff structure and operationalization of the social tariff, offering guidelines for tariff holders, regulatory bodies, and service providers. It represents a significant step towards giving concrete form to a legal institution that, until now, lacked greater national coordination.
The initiative is legitimate and socially necessary. However, as with all public policies implemented within the framework of concession contracts and public-private partnerships, the social tariff is not contractually neutral.
By altering assumptions considered in the economic-financial modeling — whether by reducing tariff revenues or by expanding the universe of beneficiary users — the implementation of the social tariff can directly impact the economic-financial balance of the contracts, requiring careful technical analysis, regulatory coordination, and the use of contractually stipulated readjustment instruments, when applicable.
This point deserves attention.
The economic and financial sustainability of contracts is an indispensable condition for the effective achievement of sanitation universalization goals. Inclusion cannot mean making it unfeasible.
It is in this context that contract management assumes a central role. The guidelines recently published by ANA make it clear that the social tariff requires:
- Assessment of the economic and financial impact throughout the entire contractual cycle;
- A clear definition of how the burdens of public policy will be allocated (holder, cross-subsidies, public funds, or tariff mechanisms);
- Consistent performance by subnational regulatory bodies;
- and, when necessary, mechanisms for economic and financial rebalancing.
Practical experience indicates that many of the controversies that tend to arise in the sanitation sector will not stem from classic defaults, but from legitimate changes in public policy introduced after the contract is signed, the absorption of which requires technically sound, preventive, and institutionally mature legal responses.
In this scenario, it is essential to understand the regulatory nuances, the cost structure of the service, the operational indicators, the economic incentives, and the role of the regulator, so that both the public and private sectors understand the best possible solutions throughout the contract execution.
More than litigation, what is projected on the horizon are processes of contractual restructuring, renegotiation, and adaptation, which require good faith, governance, and technical capacity.
The social tariff is, therefore, an emblematic example of how well-intentioned public policies need to go hand in hand with efficient contract management, otherwise they risk generating legal uncertainty, excessive litigation, and frustration of sectoral objectives.
The challenge of sanitation in Brazil is not choosing between social inclusion and contractual sustainability.
The real challenge is to make both coexist, through well-managed contracts, consistent regulation, and technical and preventive action from all actors involved.
Put Anne Elisa Perez.
