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Infrastructure · California

San Mateo Unveils $597M Wastewater Plant

San Mateo has completed its $597 million wastewater treatment plant upgrade, marking the largest infrastructure project in the city's history. The facility is designed to be one of the most sustainable treatment plants in the country.

9/19/2026Source: Water Education Foundation

The ribbon-cutting ceremony marked the end of a five-year construction period for the upgraded facility. The plant is a central component of the city's $1 billion Clean Water Program, which was initiated in 2015 to address regulatory mandates regarding sewer overflows into the San Francisco Bay.

City officials highlighted the facility's advanced design, which focuses on sustainability and long-term environmental protection. The project was necessary to ensure the city could meet modern discharge standards and prevent future environmental incidents.

This investment represents a major commitment by San Mateo to modernize its utility infrastructure. The new plant is expected to provide reliable service for decades, supporting the city's growth while protecting the health of the local ecosystem.

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