Wastewater treatment facility works to be contracted 2026 Tender

Original: Arıtma tesis işleri yaptırılacaktır

AYDIN ASKİ GENEL MÜDÜRLÜĞÜ

About this tender

The tender concerns the Zemin İyileştirme ve Yalıtım (ground improvement and waterproofing) construction works for the İleri Biyolojik Arıtma Tesisi (advanced biological wastewater treatment plant) in Kuşadası district, Aydın Province, Türkiye. The works are procured by Aydın Su ve Kanalizasyon İdaresi Genel Müdürlüğü (ASKİ) under Law No. 4734 on Public Procurement, by open tender (açık ihale) with electronic submission only via EKAP. The scope comprises a total of 6 bill-of-quantities items (kalem). Detailed specifications are in the administrative specification within the EKAP tender documents. Bidders must tender for the whole works. The contract is awarded on a unit-price basis: bidders state a unit price for each item, and the total is the item quantity multiplied by the unit price. The contract will be signed on that unit-price basis with the successful bidder. The contract duration is 240 calendar days from the date of site handover. Site handover takes place within 15 days of contract signature. Bid validity is 120 calendar days from the tender date. Electronic bidding is not held, and consortium bids are not permitted.

Bidder eligibility

Required bid documents: (1) bid letter; (2) documents proving authority to bid, including, for legal entities, information on management and partners/shareholding ratios, and for bids made by proxy, the proxy's documents; (3) provisional guarantee (geçici teminat) of at least 3% of the bid price, at the bidder's chosen amount; (4) a joint venture declaration if bidding as a joint venture. Economic and financial capacity: no specific criteria are stated. Technical and professional capacity: experience certificates for the tender subject or similar works, within the last 15 years, under a contract with a value of at least 50% of the bid price. For legal entities, a certificate issued by a chamber of commerce or registered public accountant is required where the experience certificate belongs to a partner holding more than half of the company's shares. Experience gained abroad, outside contracts with 4734 administrations, must be supported by documents evidencing any group-of-companies relationship under Article 195(2) of Turkish Commercial Code No. 6102, where used. Similar works: Groups AI, XI, AXVII and AXVIII of the Yapım İşlerinde Benzer İş Grupları Listesi (A) Alt Yapı İşleri. Qualifying engineering and architecture disciplines: Civil Engineering (İnşaat Mühendisliği), Architecture (Mimar), or Environmental Engineering (Çevre Mühendisliği). Open to domestic and foreign bidders. Consortium bids are not allowed.

How bids are scored

The economically most advantageous tender is determined solely on price (sadece fiyat esasına göre). No quality or technical scoring weights are disclosed. The applicable limit value coefficient (N) is 1.00, per the Yapı İşleri Genel Müdürlüğü communiqué published in the Official Gazette of 14 July 2026, No. 33310. Bids below the limit value require a written explanation under Article 38 of Law 4734.

Key requirements

• ✓Wastewater treatment facility construction and installation
• ✓Compliance with Turkish Public Procurement Law (4734)
• ✓Experience in water treatment and environmental infrastructure

Procurement contact

The notice names a procurement contact for clarification questions.

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.