The company said between 40 and 50 of its wastewater treatment plants are currently operating in breach of their permits.
Dozens of Welsh Water treatment plants have been illegally spilling untreated sewage for years, the company has admitted
The analysis was shared with the BBC by mathematician and former University College London Professor Peter Hammond, from campaign group Windrush Against Sewage Pollution. However, it is not allowed to release any before it reaches the overflow level stipulated on its permit.
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