Responding to consultations that ended last week, SEERA called for the agency's water resource strategy to complement the South East Plan and not rely on demand management.
It added that the strategy should help water companies promote low-carbon solutions in supplying and treating water, for instance by avoiding high-energy uses such as desalination.
Assembly chairman Keith Mitchell said: "South East residents are using less water than in previous years, but we should try to do better. It is about managing our need and our environment."
Also this week, South East Water launched a number of roadshows to gauge ideas on tackling climate change and dealing with population growth in its area. Information will be fed into its draft water management plan, due to be submitted by the end of March.