Access to clean and safe water is a fundamental human right, yet billions of people still lack access to safe water and sanitation, worsened by climate change. Achieving universal access by 2030 requires significant investment in infrastructure, and in the Philippines, public-private partnerships (“PPPs”) have emerged as a potential solution with mixed reactions—some see them as privatization, while others highlight the benefits of efficiency and innovation. This Article explores how PPPs can operationalize the Public Trust Doctrine (“PTD”) in water governance, ensuring that private sector involvement aligns with the State’s duty to protect public access to water. It articulates a doctrinal framework that harmonizes the PTD’s environmental stewardship mandate, first introduced in Maynilad v. DENR, with the principles of PPPs. Further, the Article argues that PPPs can fulfill the PTD when structured correctly, with a focus on preserving public control, enforcing fiduciary duties, and ensuring strong governance.