1. Taiwan and the global arsenic problem -- 2. Geological controls of arsenic concentrations in ground- and surface-waters : an overview of our worldwide state-of-the-art knowledge -- 3. History of blackfoot disease -- 4. Cause of blackfoot disease : arsenic in artesian well water -- 5. Non-vascular health effects of arsenic in drinking water in Taiwan -- 6. Arsenic sources, occurrences and mobility in surface water, groundwater and sediments -- 7. Arsenic in soils and plants : accumulation and bioavailability -- 8. Potential threat of the use of arsenic-contaminated water in aquaculture -- 9. Current solutions to arsenic-contaminated water -- 10. Future areas of study and tasks for the Taiwan arsenic problem.