Waternet's largest published procurement is the works contract for a second slow sand filter at Weesperkarspel, estimated at €54 million in a notice of 25 November 2024. Waternet plans construction from 2027 and use from 2031, adding up to 6 billion litres of drinking water a year.
A building team, not a simple bid
The contractor will work in a building team with Waternet and the engineering firms it has already contracted, through preparation and construction. Waternet's project page has not yet named the contractor. A second notice, published on 18 June 2026, announced an open tender for the third week of August 2026 for €4 million of prefab concrete beams and planks forming the base of twelve new filter beds, to be awarded on best price-quality ratio.
Two frameworks already closed
Waternet's tender for water meter replacement, published on 21 July 2026 with an estimated value of €2 million, closed on 2 October 2026. The contract runs from 30 November 2026 to 30 November 2030 and can be renewed twice. A seven-year contract for groundwater telemetry in Amsterdam, covering about 2,500 monitoring wells and estimated at €11 million, closed on 20 April 2026.
Market soundings come first
Waternet uses prior information notices to consult suppliers before it tenders. In August 2024 it tested the market for a staffing partner for civil engineering and drinking water treatment professionals, with a maximum value of €77 million. Documents and questions run through its Mercell buyer profile, and drinking water work falls under the EU utilities directive, 2014/25/EU.
Which of these contracts stay with Waternet after the second phase of its split, how its finances will carry the capacity programme and where suppliers should focus first are among the questions the brief answers. The full report, Waternet: Utility Account Brief, is available for USD 499. For a free overview, read the Waternet Utility Snapshot.