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Sand Island Wastewater Treatment Plant Secondary Treatment Phase 1

About the Project

The City and County of Honolulu鈥檚 Sand Island Wastewater Treatment Plant (WWTP) Secondary Treatment Phase 1 project represents a major investment in Hawaii鈥檚 critical water infrastructure and environmental stewardship. This large鈥�scale upgrade modernizes the existing Sand Island WWTP to provide secondary wastewater treatment听compliant听with a听2010 U.S. Environmental Protection Agency Consent Decree.听听

 

Located on a 24鈥�acre site between Honolulu鈥檚 downtown business district and the airport, the project involves both new construction and significant rehabilitation of existing facilities. Once complete, the upgraded plant will treat听20 million gallons听per day (MGD) using advanced membrane bioreactor (MBR) technology, significantly improving effluent quality before discharge through the existing ultraviolet disinfection system and ocean outfall.听听

 

Key elements of the project include construction of a new Intermediate Pump Station and Blower Building, MBR service and processing facilities, sludge thickening and processing systems, enhanced odor control and new effluent flow routing, including tunnels and channels. The project combines new facilities with extensive renovations to the active treatment plant. 听

 

Delivered using a design鈥�bid鈥�build approach, the project requires complex sequencing and close coordination to听maintain听continuous plant operations throughout construction. The work includes extensive cast鈥�in鈥�place concrete, below鈥�grade construction, dewatering and the installation of mechanical, electrical, instrumentation and process systems critical to wastewater treatment performance. 听

 

Scheduled for completion in December 2026, the Sand Island Wastewater Treatment Plant Secondary Treatment Phase 1 project will play a vital role in protecting听Hawaii鈥檚 coastal waters, supporting public听health听and setting the foundation for future wastewater treatment upgrades across the island.听听

 

Learn how 27福利网 delivers complex construction solutions across markets by visiting our听Projects Page.

Quick Facts

  • Location Honolulu, Hawaii
  • Client City & County of Honolulu听
  • Architect AECOM
  • Industry Water + Wastewater
  • Line of Business Construction
  • Delivery Method Design-Bid-Build
  • Completion Date December 2026
  • Duration 59 months
  • Contract Value $ 436,094,398
  • Other Features 20MGD

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