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They discharged untreated sewage and they operated dangerously inadequate water treatment plants.
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Will our fishing and tourism industries be grateful for algal blooms from untreated sewage?
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An earlier version of this piece suggested that cruise ships release untreated sewage at sea.
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Some untreated sewage had flowed out onto the streets.
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After extreme rainfall, the treatment works cannot cope with the volume of water and untreated sewage.
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Buller's mayor Garry Howard says some homes have been affected by untreated sewage after torrential flooding
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Some Buller homes affected by untreated sewage.
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The monitored storm overflows discharged untreated sewage for 272,518 hours in 2019.
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This means that 50 000 litres of untreated sewage is released every second.
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The pathogens in untreated sewage can also threaten people's health, causing gastroenteritis and even septicaemia and hepatitis A.
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The environmentally unlawful practice of sending untreated sewage into the ocean has been going on for two decades.
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This spring was probably contaminated by sewage material, due to its proximity to a source of untreated sewage effluent.
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The Nelson City Council says untreated sewage and stormwater contaminants has flown into the Nelson Haven and Waimea Estuary.
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The Nelson City Council says untreated sewage and stormwater contaminants have flown into the Nelson Haven and Waimea Estuary.
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Clare County Council has moved to stop unlicensed pumping of untreated sewage by Aer Rianta into the Shannon estuary.
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A failure of the Atawhai Rising Main at Marybank on Wednesday afternoon resulted in an overflow of untreated sewage.