ISO 24516-4:2019

Overview

ISO 24516-4:2019 provides guidelines for the management of assets in wastewater systems, focusing on wastewater treatment plants, sludge treatment facilities, pumping stations, and retention/detention facilities. It helps utilities and organizations maintain the value of existing assets and meet user expectations over long (sometimes multi‑generational) planning horizons. The standard is applicable to all sizes and types of wastewater utilities and covers strategic, tactical and operational levels of asset management.

Key topics and technical requirements

ISO 24516-4 is organized to support a full asset lifecycle and contains practical guidance rather than prescriptive technical specifications. Key topics include:

• Objectives, functional and performance requirements for wastewater assets
• Risk and life‑cycle considerations to prioritise interventions and manage uncertainty
• Structuring asset management processes across strategic, tactical and operational planning horizons
• Investigation and data collection (inventory, condition and operational data) and locational referencing
• Assessment of hydraulic, process, structural, environmental and operational performance
• Integrated planning and development/assessment of solutions, including preparation of action plans and wastewater master plans (examples in Annex B)
• Implementation: creating/updating plans, carrying out works, monitoring and review
• Operation and maintenance best practices for reliability and performance retention
• Rehabilitation: long‑term strategic budgeting, tactical prioritisation using risk‑based approaches, and short‑term implementation planning
• Documentation and performance review, plus informative annexes with example data sets and risk assessment approaches

The standard includes informative annexes (e.g., data examples, master plan content and risk‑based rehabilitation methods) to support practical application.

Practical applications and users

ISO 24516-4 is intended for:

• Wastewater utilities and asset owners planning and maintaining treatment plants, sludge facilities, pumping stations, and retention/detention basins
• Asset managers, operators and service providers responsible for operations, maintenance and capital rehabilitation
• Planners and engineers preparing master plans, condition assessments, risk‑based prioritisation and lifecycle strategies
• Small and medium utilities - guidance is scalable; organizations decide the extent of application based on size and structure

Use cases:

• Establishing an integrated asset management program for treatment works
• Preparing rehabilitation budgets and risk‑based prioritisation of capital projects
• Standardising data collection and performance assessment for operational improvement
• Developing multi‑year master plans to preserve asset value and meet regulatory/environmental requirements

Related standards

• For guidance on wastewater networks, refer to ISO 24516-3 (wastewater networks and related assets).