Master plan for wastewater and stormwater of the Champcueil treatment plant catchment 2026 Tender

Original: Réalisation d'un Schéma directeur d'assainissement des eaux usées et des eaux pluviales du bassin de collecte de la station d'épuration de Champcueil

Syndicat Intercommunal d'Aménagement, de Rivières et du Cycle de l'Eau (Siarce)

About this tender

The Siarce (Syndicat Intercommunal d'Aménagement, de Rivières et du Cycle de l'Eau) is procuring a sanitary master plan (schéma directeur d'assainissement) for wastewater and stormwater across the collection basin of the Champcueil wastewater treatment plant. The study covers the communes of Champcueil, Nainville-les-Roches and Chevannes in Essonne (FR104). Its aims are to give a global view of sanitation in the territory, resolve existing problems with the network and structures, account for demographic and urban development over 20 years, and define a coherent policy for wastewater and stormwater. The master plan includes a study of options for infiltrating stormwater and a multi-year works programme. The contract is a services contract (CPV 71300000) structured in three tranches: a firm tranche covering the EU-EP master plan excluding stormwater for Champcueil and Nainville-les-Roches, plus two optional tranches: TO1 for stormwater in Champcueil and TO2 for stormwater in Nainville-les-Roches. The optional tranches must be firmed up within 10 months of the start order for the firm tranche. Tranches may run simultaneously. The planned duration is 30 months from the start order, and the contract is not renewable. Pricing is mixed: a lump-sum global price for the items in the price breakdown, plus a framework agreement with unit prices and purchase orders, with no minimum and a maximum of 25,000 EUR excl. VAT over the contract term. The notice does not state a total lump-sum estimate. The figure used for budget_max_usd is therefore only the framework ceiling, converted at EUR×1.10, and understates the full contract value. The procedure is an open adapted procedure (procédure adaptée ouverte). Negotiation is reserved, and award without negotiation is possible. Variants are not permitted, and the contract is not split into lots.

Bidder eligibility

The notice refers to the consultation rules (Règlement de la Consultation, RC) for all participation conditions. These cover suitability to practise the professional activity, economic and financial capacity, and technical and professional capabilities. Specific thresholds, required registrations, references and proof documents are not stated on this page and must be checked in the RC. Candidates may bid individually or as members of a group. The buyer does not impose a group form. If a joint group is used, one co-contractor is named as mandatary and is jointly liable to the buyer. A candidate bidding both alone and in a group must prove the independence of the two offers. Electronic signature of documents and the contract is not required.

How bids are scored

Award criteria as disclosed on the notice: technical value 50%, price 40%, and environmental performance 10%. Sub-criteria are defined in the RC. Negotiation is reserved, and award without negotiation is possible.

Key requirements

• ✓Comprehensive diagnostic of existing wastewater and stormwater networks and assets
• ✓20-year strategic plan integrating demographic and urban development scenarios
• ✓Study of rainwater infiltration opportunities and green infrastructure options
• ✓Multi-year capital works programme with prioritisation and cost estimates

Procurement contact

The notice names a procurement contact for clarification questions.

CPV codes

Relevant sectors

About this sector

Water funding covers supply, sanitation, wastewater treatment, water efficiency, catchment management and flood risk. A large share is public procurement for infrastructure and services, alongside grants for innovation and access in underserved areas. Bidders and applicants are typically assessed on technical capacity, operating experience and community impact.