Umatac-Merizo Wastewater Plant upgraded

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The facility was originally constructed in 1981 and now it has undergone a $21 million upgrade.
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The Guam Waterworks Authority has announced the upgrade of its Umatac-Merizo Wastewater Treatment Plant (UMWWTP).

With the upgrade, more than 500 GWA customers in the villages of Umatac and Merizo can now enjoy significant improvements in the treatment of their wastewater.

The project will also help in the protection of the Toguan River and the surrounding marine environment.

The facility was originally constructed in 1981 and now it has undergone a $21 million upgrade.

The new features of the plant include: an upgraded pump station, upgraded electrical and controls, new equalization tank enhanced overland flow and constructed wetlands, and ultraviolet (UV) disinfection for occasional discharges during the rainy season.

Funding for the project came from 2010, 2013 and 2016 bond borrowing as well as system development charges assessed against land developers.

Like the Agat-Santa Rita Waste Water Treatment Plant, the Umatac-Merizo plant treats wastewater through a secondary treatment process.

The contractor’s team and GWA worked together to complete the project as quickly as possible after facing challenges, such as adverse weather and the presence of protected moorhens at the site.

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