# Portugal water service tariff regulation

> Live situation record from CLSTR: https://clstr.news/situations/portugal-water-service-tariff-regulation
> Updated: 2026-09-22T05:38:50.000Z. Sources: 5. Developments: 2.

The Water and Waste Services Regulatory Authority (ERSAR) in Portugal has introduced a new Water Services Tariff Regulation (RTA) to harmonize the rules for defining, reviewing, and updating water and urban wastewater sanitation tariffs. The regulation establishes a common framework for all state and municipal management entities to increase transparency, predictability, and trust.

The new rules aim to balance economic accessibility for users with the efficient recovery of service costs. While the regulation is set to take effect in October 2026, a transition period has been established, allowing management entities until January 1, 2029, to fully adapt their tariff structures to the new model.

## Timeline

### 2026-09-22: Regulatory agencies announce new utility and infrastructure adjustments

Regulatory agencies in Brazil and Portugal are implementing new measures: AGERGS is consulting on highway concession rebalancing, while ERSAR introduces harmonized water service tariffs.

2 sources. https://clstr.news/cluster/regulatory-agencies-announce-new-utility-and-infrastructure-adjustments

### 2026-09-10: ERSAR introduces new regulation to harmonize water service tariffs

ERSAR has introduced a new regulation to harmonize water and wastewater tariff rules in Portugal, aiming to balance user affordability with service cost recovery by 2029.

4 sources. https://clstr.news/cluster/ersar-introduces-new-regulation-to-harmonize-water-service-tariffs

---
Cite as: Portugal water service tariff regulation. CLSTR, https://clstr.news/situations/portugal-water-service-tariff-regulation