So the one other final matter is residual disinfection. Most of the 229 submitters on this issue opposed chlorine being added to their drinking water. The Christchurch City Council presented evidence that there were fewer breaches of drinking-water guidelines in Europe and the UK where residual disinfection wasn't required, compared to the US where it is, and the city council in Christchurch wanted a greater focus on risk management because of the complacency which can result by relying on chlorine. 