Toxic Spill Pollutes Filipino River

In April 2025, the Department of Environment and Natural Resources (DENR) presented a cumulative impact assessment that acknowledged both the continued “vibrance” of Manila Bay and the serious risks posed by ongoing reclamation projects, which could harm marine ecosystems and threaten the livelihoods of fisherfolk. For anyone living near or depending on the Pasig River and Manila Bay, this isn’t an abstract environmental debate — it’s a direct challenge to the water quality, food security, and flood safety that communities rely on every day.

The Pasig River has long been a symbol of both the country’s natural heritage and its pollution crisis. But recent developments — from a major international cleanup partnership to new scientific findings about reclamation — suggest the situation is more layered than a simple story of degradation. Understanding what is actually happening requires looking at the specific threats, the responses being deployed, and the gaps that remain. For a broader look at how pollution and climate change interact in the Philippines, you can read more about dual threats from climate change and pollution.

What the Pasig River Cleanup Partnership Actually Involves

The core of the new strategy is a formal partnership between the Philippine government and The Ocean Cleanup, a global non-profit that has deployed 21 Interceptors in 10 countries and collected more than 52 million kilograms of trash from aquatic environments as of April 2026. The agreement, signed by the DENR, represents a two-front approach: it aims to complement the government’s upstream regulatory push under Republic Act 11898, the Extended Producer Responsibility Act, which requires large companies to recover and recycle the plastic packaging they produce.

This is not just about installing trash-catching booms. The partnership prioritizes knowledge transfer to the Pasig River Coordinating and Management Office (PRCMO) under the DENR-National Capital Region. Over five years, the goal is to build local capacity to manage the river’s waste long after the international organization’s direct involvement ends. The Ocean Cleanup has already surveyed nearly 100 sites and is working with the DENR to identify key deployment locations that will yield maximum impact. The first Interceptor barrier is set for the Meycauayan River in Bulacan, a tributary that feeds into the larger system.

Reclamation Projects and the Hidden Threat to Manila Bay

While the cleanup partnership addresses floating trash, a separate and potentially more consequential threat is unfolding beneath the surface. More than 20 reclamation projects have been proposed or are underway in Manila Bay. Since August 2023, most have been suspended following President Ferdinand Marcos Jr.’s order for a comprehensive review, but the scale of what is planned remains enormous. Among the suspended projects are the 318-hectare Manila Waterfront City and the 400-hectare New Manila Bay Reclamation and Development Project. One of the few allowed to proceed is the Pasay Harbor City reclamation, which has secured the necessary permits and approval from the Philippine Reclamation Authority (PRA).

The DENR’s cumulative impact assessment, presented in April 2025, acknowledged both the continued ecological value of Manila Bay and the risks posed by reclamation. Researchers from the Marine Environment and Resources Foundation (MERF) documented 51 coral genera and 167 fish species in the bay — biodiversity that could be severely affected by reclamation. The assessment specifically looked at water quality and biological resources using models for flood risk and water circulation. Based on these findings, the DENR will review the environmental compliance certificates issued to Manila Bay reclamation projects and hold consultations with the PRA, local governments, and stakeholders.

Repollo’s warning about the “bottleneck effect” is worth understanding. When reclamation narrows the bay’s natural water channels, the same volume of water has to pass through a smaller space. This increases the speed and height of floodwaters during typhoons and heavy rain, and it also means pollutants have less opportunity to disperse. The result is a compounding problem: more flooding, worse water quality, and greater health risks for the millions of people living in low-lying cities and municipalities around the bay. The loss of mangroves, which act as natural coastal defenses, further weakens community resilience. For a deeper look at how water quality issues affect communities, see our report on toxic chemicals fouling water sources.

What Gets Missed in the Cleanup Conversation

Most coverage of the Pasig River focuses on visible trash — the plastic bottles, sachets, and floating debris that are easy to photograph and understand. But the river’s problems run deeper than what floats on the surface, and several important dimensions are often overlooked.

The Upstream-Downstream Disconnect

The cleanup partnership and the EPR Act are designed to work together, but they address different parts of the problem at different speeds. The Ocean Cleanup’s Interceptors can capture floating waste that has already entered the river, but they cannot stop the continuous flow of new trash from the 30 million people living in Metro Manila and its surrounding provinces. The EPR Act targets large companies, but its implementation and enforcement will determine whether it meaningfully reduces the volume of plastic entering the system in the first place. If upstream reduction fails, the Interceptors will be fighting a losing battle against an endless current of waste.

Reclamation’s Long-Term Consequences

While the cleanup partnership has a clear five-year timeline and measurable targets, reclamation projects operate on a different scale — both in terms of physical footprint and duration of impact. The suspended projects alone cover hundreds of hectares. If they eventually proceed, the changes to water circulation, sediment patterns, and pollutant concentration could undo much of the water quality improvement that cleanup efforts aim to achieve. The DENR’s review of environmental compliance certificates is a critical juncture, but the outcome remains uncertain.

Biodiversity as a Living Indicator

The presence of 51 coral genera and 167 fish species in Manila Bay is not just a scientific curiosity. It is evidence that the bay, despite decades of pollution and reclamation pressure, still supports a functioning marine ecosystem. That biodiversity is also a livelihood anchor for thousands of fisherfolk. When reclamation projects disrupt natural water flow and trap pollutants, the first casualties are often the species that local communities depend on for food and income. The loss is not just ecological — it is economic and social.

To understand how these issues connect to broader pollution patterns, consider the role of sachet production. A new report reveals familiar corporations lead in sachet production, which directly feeds the plastic waste that ends up in rivers like the Pasig.

What You Can Actually Do About River Pollution

Individual action on a problem this large can feel futile, but there are concrete steps that make a measurable difference — especially when done collectively. The following actions are grounded in the realities of the current policy and cleanup landscape.

Support and Engage with the EPR Act’s Implementation

The Extended Producer Responsibility Act is the most significant regulatory tool for reducing plastic waste at its source. Large companies are now required to recover and recycle the plastic packaging they produce. As a consumer, you can pay attention to which companies are complying and which are not. Public pressure and informed purchasing decisions can influence corporate behavior. The DENR is responsible for monitoring compliance, and citizen reports can help identify violations.

Reduce Personal Plastic Use, Especially Sachets

Sachets are the single most common form of plastic waste found in Philippine rivers. They are lightweight, non-recyclable in practice, and easily carried by rainwater into drainage systems that lead to the Pasig River. Switching to refillable or bulk alternatives for household products like shampoo, detergent, and condiments directly reduces the volume of sachet waste entering the system. This is not about perfection — even a 20 percent reduction in sachet use by a household makes a difference when multiplied across millions of homes.

Participate in Local Cleanup and Monitoring Efforts

The Ocean Cleanup partnership includes a knowledge transfer component aimed at building local capacity. Community-based organizations and local government units can participate in monitoring water quality and reporting illegal dumping. The PRCMO, under the DENR-National Capital Region, is the coordinating body for these efforts. Contacting your local DENR office to ask about volunteer opportunities or community monitoring programs is a direct way to get involved.

Stay Informed About Reclamation Decisions

The DENR’s review of environmental compliance certificates for Manila Bay reclamation projects is ongoing. Public consultations are part of the process. Attending these consultations, submitting comments, and staying informed through official channels ensures that community voices are heard. The decisions made in the next year will shape the bay’s health for decades.

Frequently Asked Questions About the Pasig River and Manila Bay

What to Watch for Next

The next 12 to 24 months will determine whether the Pasig River cleanup partnership translates into measurable improvement or becomes another well-intentioned but underdelivered initiative. The key indicators to watch are the first Interceptor deployment in the Meycauayan River, the DENR’s final decisions on reclamation project environmental compliance certificates, and the compliance rates of large companies under the EPR Act. Each of these represents a concrete milestone that will tell us whether the two-front strategy — upstream regulation and downstream cleanup — is actually working. If this was useful, you might also want to read how algal blooms are choking Filipino waters.

Sources

Empowering youth through pollution education — A look at how education programs are building the next generation of environmental stewards in the Philippines.

The Ocean Cleanup and Philippine Government Forge Alliance. The Ocean Cleanup, 2026.

DENR: Manila Bay ‘alive’ but reclamation threatens biodiversity, livelihood. Philstar.com, April 2025.