International Water Association
IWA water loss and performance indicator framework
The standard international methodology for water balance and water loss accounting, defining system input volume, authorised consumption, apparent losses, real losses, non-revenue water and the Infrastructure Leakage Index.
Rights
- Licence
- Publisher terms — public access, reuse not clearly granted
- Commercial reuse
- Not clearly stated
- Redistribution
- No
- Derivative use
- Not clearly stated
- Attribution required
- YesData from International Water Association, used under Publisher terms — public access, reuse not clearly granted.
- Restrictions
- Freely viewable, but the publisher does not state an open reuse licence. Hydrionis cites and links rather than redistributing.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- International Water Association
- Website
- https://iwa-network.org/
- Geographic coverage
- Global — methodology
- Update frequency
- static
- Formats
- pdf, html
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- leakage, utility performance
Notes
Hydrionis uses the IWA water balance definitions to keep non-revenue water and physical leakage strictly separate (spec §41). The framework itself is a methodology rather than a dataset.