Non-revenue water

Vital resources and great efforts wasted around us every second

Access to clean water is in many places taken for granted, just like the fresh air we breathe. We forget that clean water is a product, and that producing enough is actually a comprehensive, detailed process. And resources are scarce. By adding inadequate distribution management, we are faced with a more invisible, yet crucial problem: water loss, also referred to as non-revenue water, or NRW.

Non-revenue water is basically produced, cleaned water which is lost somewhere in the water distribution system, never reaching its final destination. This means water not used or paid for, affecting local economies as well as local resources available. The problem is universal, ranging from NRW levels of about 5 % to as much as 80 % in certain areas.

A World Bank study puts the global estimate of physical water losses at 32 billion cubic meters each year, half of which occurs in developing countries. Could these water losses be halved, it would be enough to supply around 90 million people.

The reasons for water losses are many, ranging from leakages, pipe bursts, and poor water management to illegal connections and unauthorised consumption. But luckily, so are the available solutions - and their benefits.

Learn about managing NRW levels here


Non-revenue water management in Bulgaria

Surrounded by sprawling parkland, Sofia, the capital and largest city of the Republic of Bulgaria, is located at the base of the popular ski mountain, Vitosha, in the western part of the country. The city has 1.4 million inhabitants. Being in the centre of the Balkan peninsula, it is midway between the Black Sea and the Adriatic Sea and closest to the Aegean Sea.

AVK has been the sole supplier of gate valves for Sofia Water for 20 years, and in the meantime also the main supplier of butterfly valves. As a result of the city’s investments, the regulation of the drinking water networks in Sofia has become much more stable, flexible and comfortable for the customers. In case of repair or rehabilitation works in the networks, smaller areas can now be closed and isolated from the rest of the networks thus affecting much fewer households. Besides water losses caused by emptying and refilling the water networks before and after, the repair works have been reduced significantly as well.

Read about the case

Modernisation of Romanian water treatment plant

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AVK Non-revenue water

AVK offers various solutions for reduction of water loss in the water distribution network.


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