Construction of household wastewater treatment plants in Liw municipality

Summary

The tender covers design, supply, installation and commissioning of approximately 42 household mechanical-biological wastewater treatment plants in Liw municipality, including external sewer connections, treated-water receivers, electrical supply, start-up and technical and technological commissioning. The contractor must complete the design, obtain the necessary permits and approvals, perform geotechnical and hydrogeological investigations, build the installations, carry out testing, train each user and provide as-built documentation. The installations must comply with EN 12566-3+A2:2013 and achieve treated-water parameters of BOD5 up to 40 mg O2/l, COD up to 150 mg O2/l and suspended solids up to 50 mg/l. The contract must be completed by 15 September 2027; design documentation and required permits are due within 5 months of signing, and the construction schedule must be submitted within 30 days. The bid deadline is 29 September 2026 at 09:00. The bid must include a PLN 12,000 tender guarantee. Offers are evaluated by price (60%) and warranty period (40%); the minimum warranty is 36 months and the scored maximum is 60 months. A 5% performance security is required from the successful bidder.