Ofwat also issued penalties of £47million to Yorkshire Water and £17million to Northumbrian Water.
Thames, facing the record fine, has been struggling with £14.7billion debts. It said last month it only had enough cash to fund operations until the end of next May.
The regulator can fine firms as much as 10% of annual sales. In the case of Thames, the biggest water supplier, the proposed fine is 9% which Ofwat chief executive David Black said "reflects the severity of the offences".
He added: "Ofwat has uncovered a catalogue of failure by Thames Water, Yorkshire Water and Northumbrian Water in how they ran their sewage works and this resulted in excessive spills from storm overflows.
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