Latvian water utilities are faced with growing operational and maintenance costs as a result of aging pipeline infrastructures. Leaks, ruptures in water supply pipelines and water theft costs a lot, thus monitoring and repairing this underground infrastructure presents a severe challenge. However, in recent years, many applications, based on wireless sensor networks for monitoring waters distribution networks, leaks and pipe burst detection have emerged. Various technical issues, such as power consumption, signal propagation models, sensors etc need to be considered. In this paper we propose a particular solution for wireless sensor networks, specifically a water distribution network monitoring system and also discuss an approach and algorithm for leak detection in water distribution pipes. We describe how this solution was successfully piloted at water distribution networks in Latvian municipalities.