GWA set to start $122 million northern wastewater upgrade project


The Guam Waterworks Authority is all set to upgrade the Northern District Wastewater Treatment Plant (NDWWTP) after awarding a $122 million contract to Black Construction for the upgrade work.

According to GWA general manager Miguel Bordallo, the work is expected to begin in early 2020 and take approximately 2.5 years to complete.

“This upgrade to NDWWTP Is the largest project to date under GWA’s system improvement plans,” Bordallo said in a news release. “This award will ensure that NDWWTP will move to secondary treatment which would meet the National Pollutant Discharge Elimination System permit requirements by the U.S. Environmental Protection Agency and increase hydraulic capacity throughout the facility to accommodate future flows.”

He added that the enhancement will improve the quality of effluent sent out into the Philippine Sea, something that GWA has been concerned about for some time now because it impacts coral reefs.

In addition, an Autothermal Thermophilic Aerobic Digestion System will be constructed reducing the NDWWTP end product sludge quantity that currently needs to be landfilled.

The Northern District Wastewater Treatment Plant was originally constructed way back in 1979 by the U.S. Navy.