Solution: Risk assessment of water supply systems
Solution: Risk assessment of water supply systems
Dipl.-Ing. Thomas Fleischanderl
Risk assessment of water supply systems
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Risk assessment of water supply systems
The new version of the European Drinking Water Directive makes it mandatory to carry out a risk assessment for water supply systems that supply more than 100 m³ of water per day or serve more than 500 people by January 12, 2029. The risk assessment and the risk management measures derived from it must be reviewed regularly, at least every six years, and updated if necessary.
The results must be subjected to risk management. The risk assessment must be based on the general principles of risk assessment. This is based on international standards such as EN 15975-2 “Security of drinking water supply – Guidelines for risk and crisis management”.
Mandatory performance of a risk assessment
As part of the risk assessment of the water supply system
- the results of the monitoring programs pursuant to Sections 59c to 59f of the Water Act 1959 are taken into account
- the supply system is described from the point of abstraction through the treatment, storage and distribution of the water to the delivery point
- the hazards and hazardous events in the supply system are identified
- assessed the risks that these hazards and events may pose to human health through the use of water intended for human consumption
- Considers risks to the quality of water intended for human consumption arising from climate change, water losses and leaking pipes
Risk control: regular updating
Based on the results of the risk assessment carried out, the operator of a water supply system must take the most appropriate risk management measures for the identified risk. The aim is to prevent and reduce risks that could endanger the quality of water for human consumption:
- Determine and implement risk control measures to prevent and mitigate the risks identified in the supply system
- Determination and implementation of risk control measures in the supply system to reduce risks from the catchment areas of abstraction points. This obligation applies to the operator of a water supply system provided that the definition of such measures is within its sphere of influence.
- Ensure that where the treatment or distribution of water intended for human consumption includes disinfection, the effectiveness of the disinfection process used is verified. Any contamination from disinfection by-products should be minimized without compromising the disinfection process
- Verification that materials and substances used in the supply system that come into contact with water intended for human consumption, as well as substances and products used for treatment, meet the requirements applicable to them.
- The risk assessment and the risk management measures derived from it are regularly reviewed and updated if necessary. The maximum interval between reviews is six years.
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