This is the center of the kidney disease phenomenon known in medical circles as CKDu (Chronic Kidney Disease of Unknown etiology). Kidney failure (CKD) caused by diabetes and heart disease is common around the world, including Sri Lanka where up to 15% of the population has some level of the condition. However, in the past decade or so, a new cases with unknown causes have increased, mostly among agricultural workers. Pesticide exposure, contaminated water and even cooking utensils have been implicated, but still no clear cause has been identified. In the highest risk areas, the National Water Supply and Drainage Board has been providing treated water to reduce people’s use of well and river water. This seems to be having some benefits. So, what exactly is in the water? And will I be able to figure it out?