United Utilities says the discharge into Windermere occurred because of heavy rain.
Untreated sewage was continuously discharged into a Site of Special Scientific Interest for six days.
The water company said overflows are "designed to operate during heavy rainfall, like that seen in the Lake District over recent days". The wastewater treatment works at Near Sawrey began discharging into Cunsey Beck, which flows from Esthwaite Water to Windermere, at 06:11 BST last Thursday.
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