Filderwasserversorgung, Water supply cooperative in Esslingen, Germany

Filderwasserversorgung is a water supply cooperative in Esslingen that serves ten member communities with drinking water. A main pipeline network of about 24 kilometers transports water from Neckartailfingen to Vaihingen, supplying roughly 134,000 people along the way.

The cooperative was founded in 1904 when eight municipalities joined forces because groundwater in the western region of Esslingen was insufficient. Later, sources from Lake Bodensee were tapped as an additional water supply to meet the growing population's needs.

The name Fiwa is used locally for the Filderwasserversorgung, whose ten member municipalities elect a chairman for a ten-year term; since 2010 this has been Roland Klenk, mayor of Leinfelden-Echterdingen. The association's office is in the old town hall in Musberg, and its operations are run by EnBW Regional AG.

The office is in the old town hall in Musberg, while the pumping works and the 1,000-metre seepage gallery lie in the Neckar floodplain at Neckartailfingen. The works are technical installations, not a visitor site, so arrange any visit through the Zweckverband in advance. Since 2012 a nanofiltration plant has softened the hard Neckar water from about 21 °dH to roughly 9.5 °dH.

The intake at Neckartailfingen is a 1,000-metre seepage pipe laid on both sides of the Neckar in a gravel bed up to five metres high. The river water filters through the gravel before it is pumped into the 24-kilometre main to Vaihingen, which began operating on 6 October 1906.