Contingency plan

If a water supply fails, it is very serious. This can, at worst, cause the installation to demobilize. The potable water regulations, activity and management regulations therefore require a risk and vulnerability analysis as a basis for contingency planning.


These five undesirable dimensioning events constitute the events that are considered a minimum in relation to contingency planning for the potable water area:

  • Water Shortage
  • Failure in hygienic barriers
  • Outbreaks of waterborne epidemics / disease
  • Outbreak of Legionella infection
  • Chemical contamination

Based on the risk and vulnerability analysis, a contingency plan is drawn up that deals with implemented measures that reduce the likelihood of an undesirable event occurring. The contingency plan addresses the remaining risk. The purpose is to reduce the risk of the problem arising and to establish procedures for dealing with problems that still arise.


The contingency plan should be divided into an operational part and an administrative part.


The operative section describes action lists which in turn tell us how the emergency organization should deal with the various design events.


The administrative section describes how the contingency organization is structured, what roles are responsible for what, what contingency resources are available and a description of the design of undesirable events.

It is important that the contingency plan is a functional and useful document that can actually be used in a drinking water crisis. Everyone in the emergency organization must know the content of the plan and its roles and responsibilities.

The Norwegian Food Safety Authority’s guidance “Increased safety and preparedness in the water supply” provides a description of hazard mapping and hazard management according to the ROS method, which is also in accordance with the procedure described in standard NS-EN 15975-2. By following the method described in 14 this guide, you can satisfy the requirements in the drinking water regulations for hazard mapping and hazard management in section 6, for ROS analysis in section 11 and for the risk assessment in accordance with NS-EN 15975-2 in section 21.