As others have said there is ...

As others have said there is not a limit on the residual concentration, globally some countries may set them. It is also necessary to consider the type and extent of the distribution network as a wide range of water ages may mean that consumers experience different levels and require other solutions such as ammonia addition to stabilise the residual of disinfected water or network booster dosing of chlorine.

In fact in one recent incident in the UK the water company was prosecuted after a failure of the control at a network booster led to a massive overdose. However the grounds were not breaching a specific limit but supplying unwholesome water.