The water can still be boiled and bathed in but not used for drinking or preparing food.

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Local residents and livestock were not at risk as the river was not used for drinking water, officials added.

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But he said the boys had also learned from the experience, not least from a youth advice website they used for researching teenage drinking.

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From medieval times, the Fleet was lined with wells, used by local people for drinking water.

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The natural gas industry has argued that flawed casing practices used while drilling shale-gas wells were responsible for methane contamination in drinking water supplies surrounding shale-gas wells.

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In fact, a recent survey of teens revealed that while 87 percent of teen passengers would speak up to ask a driver to refrain from getting behind the wheel after drinking, only 72 percent of teen passengers would do the same for a driver who has used marijuana.

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