Two water companies have been fined a combined £86.8m over sewage-related failures.
Industry watchdog Ofwat – itself set to be scrapped as part of a shake-up of oversight in the sector – said Anglian Water and its shareholders faced a redress package of £62.8m.
The penalty for South West Water stood at £24m.
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The pair are the latest firms to face financial consequences for breaching obligations in the operation of their wastewater treatment works and networks.
Ofwat said that both failed to operate, maintain and upgrade their wastewater assets adequately to ensure they could cope with flows of sewage and wastewater.
The reports also criticised the processes and management at the companies, including board level oversight.
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The regulator said its five wastewater investigations to have concluded this year had resulted in enforcement action worth more than £240m.
Much of the cash goes towards storm drain improvements and local projects aimed at restoring river eco systems.
Lynn Parker, senior director for enforcement at Ofwat, said: “Our investigations found failures in how Anglian Water and South West Water have operated and maintained their sewage works and networks, which has resulted in excessive spills from storm overflows.
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“These are serious breaches and are unacceptable.
“We understand that the public wants to see transformative change.
“That is why we are prioritising this sector-wide investigation, which is holding wastewater companies to account for identified failures.
“We are pleased both companies have accepted that they got things wrong and are now focusing on putting that right, and taking action to come back into compliance.”
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Household bills are on the rise, at inflation-busting rates, over the next five years as the industry scrambles to make improvements to infrastructure.
It is under pressure to save more water, through leak prevention and improved storage, as climate change presents twin problems of extremes.
While storm drains have been unable to cope with vast volumes associated with heavier storms, rainfall has been scarce since spring with the UK seeing its hottest summer on record.
