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However, short periods of excess exposure can cause gastrointestinal disturbance, while longer-term effects include liver and kidney damage, which is why the EPA monitors copper in drinking water.

India, meanwhile, has been pushing to review and modify the treaty, citing changing needs - from irrigation and drinking water to hydropower - in light of factors like climate change.

“Infrastructure being offline for maintenance or repairs is part of the regular operational need of a water system and critical for maintaining safe drinking water standards.”

Heal the Bay found concentrations of aluminum, iron, selenium and manganese that were higher than drinking water standards, sometimes by 10 times as much.

Mr Guy said pictures showed Emily enjoying herself, and she was later seen coming out of a toilet and putting something into her mouth and drinking water.