Water is precious, especially in Saudi Arabia. The local water supplier General Directorate of Water Qassim (GDOW) wants to get the problem of non-revenue water under control. GDOW Qassim ensures the supply of water to over 1.4 million people in the Al-Qassim region of Saudi Arabia. Within the Fixed Network up to 85,000 HYDRUS ultrasonic water meters with integrated radio modules were ready for fully automatic reading in the Al Qassim region immediately after installation. Permanently installed IZAR RDC PREMIUM receivers collect the data sent by the ultrasonic water meters and transmit them to a central FTP server every two hours. The server imports the data to the IZAR@NET meter data management software for on-site monitoring of the distribution network at the local water commission. IZAR software also transmits accurate data for the consumption calculation using an interface to the billing system of the water supplier. The extensive radio range of the Fixed Network enables the stationary radio receivers to collect the meter data without errors. By incorporating IZAR@NET software, GDOW Qassim can now analyse the hourly meter data in detail. Alarm functions alert in case of disruptions within the pipeline or errors with the water meters, allowing leaks to be discovered and repaired promptly. An interface to the billing system enables a precise consumption billing. The improvement of the pipeline network has minimised the non-revenue water problem and has positively affected the water supplier’s revenue. Overall, the Diehl Metering solution enables an efficient and sustainable use of the valuable water resources for the whole Al-Qassim region.