Honouliuli Wastewater Treatment Plant Secondary Treatment Phase 1A & 1B

Serves one of the fastest growing parts of Oahu

Honouliuli Wastewater Treatment Plant serves one of the fastest growing parts of Oahu: From Halawa to Kapolei to Ko’olina. The plant currently does not meet minimum treatment standards set by the Clean Water Act, so under the 2012 consent decree between US EPA and the City and County of Honolulu, the plant will expand to full secondary treatment capability.

The new system will take the waste sludge from Honouliuli and various other wastewater plants on Oahu, thicken and dry the product so that it is suitable for use as fertilizer. This beneficially reuses a resource that was previously sent to the landfill and helps make Hawaii’s agriculture more sustainable. In order to accomplish the upgrades the new facilities must be constructed and commissioned in a phased timeline while maintaining operation of the existing solids processing system. This requires extremely close coordination with the plant operators as well as the numerous other simultaneous projects on the plant.


Ewa Beach, HI


City & County of Honolulu, Department of Environmental Services

Year Completed

  • Ongoing


  • Construction Management


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