The Science of Saving a River

The Iloilo River Esplanade is, without question, one of the most celebrated urban renewal projects in the Philippines. It is a testament to what political will and thoughtful design can achieve, transforming a neglected waterfront into a vibrant public space. We have made the river look good. But the new partnership between the University of the Philippines Visayas and the Iloilo City Government forces us to ask a more difficult, more important question: Is the river truly good?

The project, “Revitalizing an Urban River,” goes beyond the aesthetic and plunges into the ecological. It moves past landscaping and into the laboratory. This scientific study is the critical, unseen foundation required for the river’s long-term survival, because true sustainability is measured in parts per million, not in picturesque promenades.

For years, we have treated our urban rivers as little more than drainage canals, the unfortunate recipients of the city’s effluent. The Iloilo River is no exception. While the Esplanade offers a pleasant stroll, the water itself tells a different story. Data from the Environmental Management Bureau (EMB) has consistently shown that sections of the Iloilo-Batiano River System struggle to meet water quality standards. Monitoring stations frequently show high levels of fecal coliform, indicating contamination from domestic wastewater, and low levels of dissolved oxygen, a sign of an ecosystem gasping for breath. Much of the river is classified as Class C, suitable for fisheries and boating but not for swimming. Other parts have historically dipped even lower.

This is the invisible reality that beautification alone cannot fix. Mayor Raisa Treñas correctly identified the core issue when she said, “The study is very important as we are also looking into the water quality of the river to ensure its sustainability and biodiversity.” This scientific deep-dive, covering 29 barangays, will finally give us a clear diagnosis of the river’s health, tracing pollution to its sources and documenting its impact on the communities who call its banks home.

Perhaps the most telling detail is that this initiative will inform the first update of the river’s master plan since 2002. As UPV Vice Chancellor for Planning and Development Rhodella Ibabao noted, “This will be the first time that we will be updating the master plan.” Let that sink in. The city of Iloilo has been operating on a developmental blueprint for its central artery that is over two decades old. The urban pressures, population density, and commercial activity of today bear little resemblance to the landscape of 2002. To continue using an outdated plan is not just negligent; it is a recipe for ecological failure.

To understand the journey ahead, we can look to global examples. This year, the world watched as athletes swam in the River Seine during the Paris Olympics—a feat that was unthinkable 30 years ago when the river was declared biologically dead. That achievement was not the result of a single project, but the culmination of a €1.4 billion, multi-decade effort rooted in rigorous scientific study, massive infrastructure investment in wastewater and stormwater management, and uncompromising political will.

Paris is in its moment of fruition; Iloilo is at its foundational stage. This comparison is not meant to diminish our local efforts but to contextualize them. A swimmable Iloilo River may seem like a distant dream today, but the path to that dream does not begin with wishful thinking. It begins exactly where we are now: with methodical data gathering, stakeholder engagement, and the creation of an evidence-based plan.

The collaboration between UP Visayas and the city government is a commendable and necessary step forward. However, the true test will come when the study is completed this December. The findings cannot be allowed to gather dust on a shelf. They must become the basis for a new master plan with real teeth—one that includes stricter zoning regulations, investment in septage and sewerage systems, and consistent enforcement against polluters.

The Esplanade was Phase One, the successful revitalization of the river’s body. This study marks the beginning of Phase Two: the critical, urgent work of healing its soul.