This publication carried out by the Environment Agency examines rainwater harvesting systems for non-potable domestic uses in houses and gardens. This guidance is for homeowners, house builders, planners, plumbers, architects and building managers. It contains information on the benefits of rainwater harvesting systems, their design, installation, maintenance requirements and cost. It also contains examples of systems that have been installed and are in use. Many of the concepts discussed can also be applied to industrial and commercial premises.