High quality drinking water delivered to customer taps
30 October 2026
Greater Western Water (GWW) has published its 2025-26 Drinking Water Quality Report, providing customers and the community with an overview of how drinking water is monitored, managed and tested across our service area.
This report is provided to the Secretary of the Department of Health in accordance with section 26 of the Safe Drinking Water Act 2003 (SDWA 2003) and regulations 21 and 22 of the Safe Drinking Water Regulations 2025 (SDWR 2025).
To help ensure drinking water remains safe from source to tap, GWW conducted almost 20,000 independent biological, physical and chemical tests on 130,000 samples through its source water and drinking water monitoring programs. The report outlines the extensive monitoring, testing and risk management activities that support the delivery of more than 148 billion litres of safe drinking water.
2025-26 highlights
More than 148 billion litres of safe drinking water delivered.
Continued monitoring of source water and drinking water across the GWW service area.
Successful recertification of our drinking water quality management system under the Hazard Analysis and Critical Control Point (HACCP) framework.
