Water Supply

In some regions, roof-collected rainwater supplies for household or community use are very common. These systems are very vulnerable to contamination by volcanic ashfall because of the high ratio between the collection area and the volume of the tank. Tank water contaminated by ash is unlikely to be a health hazard as elements released from the ash (particularly iron, manganese and aluminium) can impart an unpleasant metallic taste to the water making it unpalatable to drink, with this effect outweighing the release of any toxic elements such as fluorine from the ash.