This tender invites contractors in Karachi for critical repair and maintenance of sewerage lines across multiple locations including Manzoor Colony-II, Akhtar Colony, Azam Basti, Chanesar Goth, and Mehmoodabad. The Karachi Water and Sewerage Corporation requires replacement and desilting of defective sewerage pipes ranging from 09" to 18" diameter using winching machines, ensuring smooth sewerage flow and preventing blockages in these densely populated areas. Additionally, the construction of a new 11 KVA sub-station at the Hub Filter Plant is included, requiring adherence to K-Electric specifications and grid line connections. The scope involves excavation, dismantling, laying RCC pipes with rubber ring joints, manhole construction, and desilting operations using specialized mechanical and electrical equipment. The sites are located in busy urban zones of Karachi, demanding careful traffic management and safety measures to protect labor and public property. Contractors must be prepared for engineering challenges such as working in congested areas and ensuring minimal disruption to sewerage services. Bidders must hold valid PEC registration with relevant specialization, be on the active tax payer list of FBR and Sindh Revenue Board, and demonstrate experience with at least five similar projects completed in the last three years. Financial turnover must meet or exceed the estimated cost, and all required documents including income tax returns and audit reports must be uploaded on the EPADS portal. The tender fee and bid security must be submitted as pay orders in favor of Karachi Water and Sewerage Corporation. Submission deadline is set for 02-April-2026 at 2:00 PM, with bid opening at 2:30 PM in the office of the Accounts Officer (Sewerage) at KW&SC, Room No.12-A, 1st Floor Block-C, 9 Mile Karsaz Shahrah-e-Faisal Karachi. Bids must be submitted online via the EPADS portal and accompanied by physical bid security and tender cost pay orders. Pro-Tip: Ensure your bid documents include a notarized affidavit confirming the firm is not blacklisted and double-check the pay order details for bid security and tender cost to avoid disqualification. Also, carefully review the composite schedule of rates and quote rates in both words and figures as required.