International Water Association | 127,730 followers on LinkedIn. Inspiring Change | The International Water Association (IWA) is a global organization that works with an interdisciplinary network of water professionals and partners to create a water wise world. Our experts collaborate and combine their knowledge to spread practical know-how throughout the entire water cycle to help us reduce, reuse, and replenish water resources. IWA is the global reference point for water professionals working in all aspects of the water cycle.