DIN EN 1717:2026-02

The DIN EN 1717:2026 standard establishes guidelines for protecting drinking water systems against contamination caused by backflow. It specifies comprehensive requirements for protective devices ensuring that contaminated water cannot flow back into drinking water systems. This standard covers the assessment of risks posed by mechanical, hydraulic, and atmospheric factors, as well as the selection of appropriate safety measures. It provides a critical framework for planning, installing, and maintaining water supply systems.

How does the book support professionals in their daily work?

This document is an essential tool for water and gas professionals, planners, and installers, as well as operators of drinking water systems. It provides assistance by:

• Identifying contamination risks in water installations and defining targeted protective measures.
• Selecting and installing appropriate safeguarding devices, such as backflow preventers or system separators.
• Ensuring precise implementation of requirements and solutions for various application scenarios, including domestic and non-domestic uses.
• Reviewing technical changes compared to previous versions – for example, the updated Annexes A to C and revisions to sections on free outflow arrangements.

The publication is especially practical, offering real-world examples such as the use of rainwater, livestock watering troughs, or flushing compressors, alongside tabular overviews and installation requirements for specific protective devices.

What technical changes have been made?

The updated version includes significant changes:

• Clarification and expansion of the scope of application.
• Updated tables, annexes, and illustrations.
• Revisions to the section on overflow arrangements.
• New details on installation requirements for protective devices.

What are the additional benefits of the product?

• Comprehensive guidance within the context of European and national legislation.
• Integration into the DVGW (German Technical and Scientific Association for Gas and Water) rulebook for water, ensuring maximum applicability in practice.
• Clear and well-structured presentation of all requirements.
• Assists in maintaining long-term drinking water quality and protecting against legal disputes by ensuring compliance.

Who is the book aimed at?

• Professionals from the plumbing, heating, and air conditioning sectors.
• Engineers and planners responsible for designing and optimising water installations.
• Operators and maintenance managers working with drinking water systems.
• Technical inspectors and auditors assessing water systems.

Conclusion:

The DIN EN 1717:2026 standard is essential for the effective protection of drinking water systems and provides practical support for professionals involved in the planning, installation, or maintenance of these systems. With its precise guidance on risk assessment and protective measures, it significantly contributes to operational security and compliance with legal standards.

This document replaces DIN 1988-100:2011-08 and partially replaces DIN EN 1717:2011-08 .