World Water Day

Last year, a total of 8,415,537 m³ in drinking water was supplied and average consumption was 21,432 ^m3 per day. Owing to technological improvements, the average amount of drinking water consumed per resident per day has dropped from 183 l/day in 2015 to 163 l/day in 2025, which constitutes an 11% decrease. It should be noted, that this average includes not only residents' consumption but also that of industrial facilities, offices, secondary schools, swimming pools and other infrastructure in the city.

At the end of the year, the City of Luxembourg's drinking water supply network spanned 447,164 km of pipe, covering the entire city. In order to ensure uninterrupted supply and to cope with the city's urban development, outdated pipes need to be replaced and new ones laid. In 2025, no less than 4.8 km of pipes were replaced and 1.5 km of new pipes were laid. In addition, the City has continued to deploy smart meters to detect leaks on residents' private networks. At the end of 2025, smart meters comprised 57% of connections, up from 37% in 2024.

The quality of the capital's water supply is one of the City's top priorities: some €354,000 was invested in quality control to ensure that the city's drinking water is completely clean and safe. The water supplied by the City undergoes regular chemical and microbiological testing in the springs and reservoirs, as well as in the supply network. In 2025, 4,737 tests were carried out. This far exceeds the mandatory number of tests.

At the end of 2025, the City of Luxembourg's sewer network spanned 708 km, an increase of 4 km on the previous year. As part of ongoing network maintenance work, 419 km of network pipes were cleaned, and 20,182 siphons and 4,228 culverts emptied. To ensure the proper disposal of wastewater, the <em>Service Canalisation</em> has undertaken the systematic and strategic renovation and refurbishment of old or damaged sections of the sewer network. It should be noted that water mains are renovated – using the pipe-lining technique – only if their structural condition is sound, and if their hydraulic capacity will remain sufficient. On the other hand, if the mains are in poor condition, or if their hydraulic capacity is deficient, they are replaced. Accordingly, 520 m of sewer lines were upgraded, and 3,450 m of water mains were completely replaced.

The Beggen water treatment plant, which processes wastewater from Luxembourg City, the municipalities of Bertrange, Strassen, and Leudelange-Schléiwenhaff (belonging to the municipality of Leudelange), as well as the village of Roedgen (belonging to the municipality of Reckange-sur-Mess) and the western part of Findel (belonging to the municipality of Sandweiler), treated 18,296,208 m³ of wastewater. Processing wastewater leads to the build-up of sewage sludge. In 2025, the water treatment plant produced 7,308 tonnes of sludge. The sludge was recycled by incineration in Luxembourg (284 tonnes), Germany (6,981 tonnes) and Belgium (43 tonnes).