Bogged down:The government's stance on well water is: Drink at your own risk.
Aug 4 / The Asahi Shimbun
In March, the prefectural government urged households to switch to tap water after arsenic levels about 40 times higher than the government standard were detected in Ikeda's and nearby wells.
The contamination is believed to have come from leaking chemical weapons buried by Japanese troops at the end of World War II....An official at the Environment Ministry implied that anyone drinking water from a private well does so at his or her own risk.
``Drinking well water is the same as drinking water from a puddle,'' he said.
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Also see the thread: Beer bottles found to contain mustard gas