Overview
ISO/TR 24589-2:2025 - "Examples of good practice for the management of assets of water supply and wastewater systems - Part 2: Wastewater systems" is a Technical Report from ISO that compiles selected practical examples for managing physical assets in wastewater systems. It is a supporting document to ISO 24516-3 and ISO 24516-4, intended to help utilities and asset managers realize value from existing assets by applying condition‑based, risk‑oriented practices at strategic, tactical and operational levels.
Key topics and technical highlights
This document focuses on operational‑level asset management for wastewater infrastructure (collection networks, treatment plants and ancillary elements). Key technical topics covered include:
- Asset management objectives for multiple utilities and individual system components.
- Strategies: maintenance strategy, renewals decision‑making, and inspection approaches for collection networks.
- Investigation techniques: non‑destructive sewer condition investigations, best practices for CCTV inspection (including automated CCTV assessment), and hydraulic investigations (flow monitoring and hydraulic modelling).
- Assessment methods: deterioration predictive models, maturity assessment of operations, and simplified/monetized FMECA (Failure Mode, Effects and Criticality Analysis) for treatment plants.
- Implementation and field works: sustainable construction and rehabilitation practices.
- Operation & maintenance: odour management, dynamic simulation for process optimization at wastewater treatment plants (WWTPs), monitoring and control, hypervision and integrated information systems.
- Rehabilitation planning: network renewal plans, condition‑ and material‑based rehabilitation strategies, and plant renewal planning.
- Annex A provides a recapitulative table summarizing the examples of good practices.
Practical applications
ISO/TR 24589-2:2025 is designed to be applied where utilities need concrete, technical examples to implement the guidelines in ISO 24516 series. Practical uses include:
- Developing condition‑based maintenance and inspection programs for sewer networks.
- Informing renewal and rehabilitation investment decisions with predictive deterioration models and FMECA outputs.
- Implementing CCTV and automated inspection workflows to improve condition assessment accuracy.
- Using hydraulic modelling and flow monitoring to prioritize rehabilitation and optimize WWTP performance.
- Improving operations, odour control, monitoring and control systems, and integrating asset data into information systems for better decision making.
Who should use this standard
- Wastewater utilities and operators
- Asset managers and planners
- Consulting engineers and inspection contractors
- Regulatory bodies and public works departments
- Project managers responsible for rehabilitation and renewal programs
Related standards
- ISO 24516-3 and ISO 24516-4 (guidelines for management of assets of wastewater systems)
- Other parts of the ISO 24589 series (see ISO website for the full list)
Keywords: ISO/TR 24589-2, wastewater asset management, CCTV inspection, condition assessment, rehabilitation planning, hydraulic modelling, FMECA, odour management, wastewater treatment plant.
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