This document provides guidelines for the planning and implementation of hardening of different water and wastewater infrastructures aiming to improve the resilience of water and wastewater services provided by water utilities through security measures.

It applies to the determination of measures for the protection of water supply systems and sewer collection systems from unwanted or unplanned access, as part of risk management. This document is applicable to all water and/or wastewater utilities.

This document does not include guidelines for the protection of large water sources such as lakes or rivers.