SWW said the trial was “pioneering” and that it had been careful to exclude customers on social tariffs who may be struggling to pay their bills.
It also said customers who felt they could not be part of the trial due to financial concerns, moving house, or a health condition that would be exacerbated by being on the trial, should let the company know.
CEO Susan Davy said the company believed “everyone deserves a fair, transparent, and simple way of being charged for the water they use”.
She said: “The introduction of our new customer tariffs is a direct response to what our customers have told us.
“We are launching two new tariffs as part of a trial to find better ways to charge customers based on the water they actually use.
“Water is precious and we are doing more than ever to secure resources for now and the future.”
The trial is due to start on 1 October.
