Global ILIs

Regional Summaries of Infrastructure Leakage Index

Real Losses Management Comparisons using International Best Practice

The IWA 1st Water Loss Task Force created the UARL and ILI in 1999 as the only measure specifically designed for national and international performance comparisons of technical Real Losses management. This site will summarise hundreds of ILIs that have been calculated by and for Utilities in different regions, countries and states or provinces.

Traditional performance indicators (per km mains, per service connection, per property) are often misleading for meaningful  comparisons; %s  always are.

In contrast, UARL and ILI make due allowance for key system specific parameters – system size, connection density, meter location, average pressure – to create a ‘level playing field.’

Utility performance in NRW and Real Losses management is an extremely sensitive issue in most countries. Some Utilities accept the challenges of openness, others prefer to participate in comparison exercises only if their anonymity can be protected; often so they can identify such weaknesses as may exist, and obtain guidance on how to improve their performance.

One of the simplest uses for a calculated ILI (which is a dimensionless number) is to broadly interpret Real Losses management performance at current operating pressure. An International Leakage Performance Category (LPC)  classification system,  shown in the Concepts webpage UARL and ILI, is used to identify general recommended strategies for improvement. The LPC classification has 8 categories (A1 to D2);  LPC boundary values of ILI for High Income Countries (HICs) are twice as large as boundary values for Low and Middle Income Countries, so it is necessary to identify if a particular country is an HIC or a LAMIC.  A list of High, and Low/Middle income countries (with High/Middle break point around $US 12 to $US13k median per capita income) can be found at

To access ILI data sets Click on the territory links below or the ‘Global ILIs’ drop down menu above.

Australian ILIs   New Zealand ILIs

European ILIs     AquaFlanders Utility ILIs   Austrian ILIs   Croatian ILIs  Danish ILIs  Netherlands ILIs  Portuguese ILIs

North American ILIs   Canadian ILIs

With free access to this ILI database, it is hoped that more Utilities and countries will be encouraged to calculate and publish ILIs (attributed or anonymous) for their systems. Quality control and data sources will be identified. ILMSS and WLR&A reserve the right not to include ILI data, particularly where they may be unsure of the reliability of the calculations.

Most of the ILI data sets for Countries, regions or groups within countries listed above are only partial ILI data sets. A simple initial overview approach to using the sample data to assess overall leakage management efficiency of each country/region/group – whether it has a complete or partial ILI data set – is described in ILI Overviews by Country.

12 August 2017