The results of the drinking water quality control in 2025 confirm the maintenance of high performance standards by the Municipality of Angra do Heroísmo. According to the Annual Report of the Regulatory Authority for Water and Wastewater Services of the Azores (ERSARA), the municipality achieved a compliance level with parametric values of 99.85%, having recorded the same result in the "Safe Water" indicator, a value exceeding the regional target of 99% established for the sector.
The municipal supply system currently serves 33,771 inhabitants




