Price scheme and tariffs: a public policy favouring the costs redistribution among users and a reduction of consumption.

The results of the experiments carried out in Herault Department show that dual pricing can have very different impacts.

The dual pricing of "summer/winter" drinkable water makes it possible to charge more for water consumed during the summer months and, thus, to let the tourists pay their share of water cost. The purpose of dual pricing is not to generate additional revenues, rather to lower the consumption. The local authorities have different means to inform about this policy and, some of these, are more efficient than others. In fact, using the water bill, for example, would restrict the message dissemination, limiting just to the subscribers and, by consequence, excluding the tourists. This target, which is mainly at the centre of this measure, is more difficult to get aware of water savings attitude. The results of the experiments carried out in Herault Department show that dual pricing can have very different impacts depending on the water services and that the impact is not necessarily proportional to the adjusted prices. Actually, this measure must be accompanied by communication and awareness plans among users. Indeed, the measure understanding promotes its acceptability and therefore its effect.