At one of those wells they found an elevated level of manganese in the untreated water.
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If levels continue to rise faster than pumps can abstract, untreated water could enter the Carnon river.
BBC: Concern contaminated Wheal Jane water may pollute river
Requiring no other technology or special skills, the filters are simply immersed in untreated water, stirred and then removed, leaving behind safe drinking water.
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The Environment Agency said it was concerned if levels had continued to rise faster than pumps could abstract, untreated water could enter the Carnon river.
It was feared untreated water from Wheal Jane, near Baldhu, could spill into a nearby river if levels continued to rise following the heavy rain.
But water companies needed to invest in the sewer network to ensure untreated waste water was only released in urgent cases.
Unfortunately, these systems frequently overflow, and so untreated sewage and storm water runoff are expelled into surrounding water bodies.
New pollutants, such as detergents, are entering the water supply untreated.
Like many cities, Cincinnati has a combined sewer system that is easily overwhelmed in wet weather, when untreated stormwater mixes with wastewater and overflows into water bodies or backs up into homes.
When storms hit, these systems can overflow, sending untreated sewage into rivers, lakes, beaches, and drinking water supplies.
The water from the mine is contaminated with a range of metals which, untreated, could impact on shellfish and other ecology in the Fal Estuary.
The water from Wheal Jane mine is contaminated with a range of metals which, untreated, could impact on shellfish and other ecology in the Fal Estuary.
Carried by contaminated water or food, it causes severe dehydration through diarrhoea and can prove fatal if untreated.
The court heard how the spills saw untreated sewage engulf areas around the loch, "smothering" plant life and starving the surrounding water of oxygen.
Delhi draws three-quarters of its drinking water from the Yamuna river, into which the city dumps quantities of sewage, almost all of it untreated, to join a cocktail of farm chemicals and industrial effluents, including arsenic.
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