Eight and a half million metric tons of silt and solid waste pulled from Metro Manila’s waterways in five years. That’s the tally from San Miguel Corporation’s Better Rivers PH program as of mid-2025 — a number that translates into 161 kilometers of river channels cleared and, more importantly, a measurable reduction in flood risk for communities that used to watch their streets fill with water every rainy season. At the same time, a separate five-year agreement between the Philippine government and Dutch non-profit The Ocean Cleanup is bringing solar-powered Interceptor barriers to the Pasig River and beyond, targeting the plastic waste that silt cleanups alone can’t stop. These two efforts — one private-sector, one international partnership — represent the most coordinated push to restore Philippine rivers in decades, and they work on different parts of the same problem.
Three Forces, One Goal
River restoration in the Philippines today runs on three distinct engines: corporate social responsibility, international technology partnerships, and government coordination. Each brings something the others can’t.
The three approaches aren’t competing; they layer on top of each other. Dredging restores river depth and flow. Interceptors catch what still floats in. Government regulation aims to reduce what enters the water in the first place. Together they form a strategy that addresses symptoms, ongoing pollution, and root causes.
What the SMC Cleanup Actually Did
When Better Rivers PH started in 2020, the Tullahan, Pasig, and San Juan rivers were the priority. These waterways had been made shallow by years of unchecked silt and garbage buildup, meaning even moderate rain caused overflow. The program’s early work focused on restoring hydraulic capacity — essentially giving the rivers room to hold and move water again.
From there it expanded north into Bulacan and Pampanga, and south into Parañaque and Laguna. By June 2025, SMC had completed cleanup of the Tunasan River in Laguna, removing 53,774 tons of silt and waste from that waterway alone. That followed the Biñan River cleanup, which pulled out 87,899 tons, and the San Isidro River in San Pedro, where workers removed 417,044 tons. Two more Laguna rivers are scheduled next.
The impact on flooding has been direct. Years of accumulated debris had reduced the carrying capacity of these river systems to the point where they couldn’t drain rainfall quickly enough. By removing the material and restoring channel depth, the program allowed floodwater to reach Manila Bay more efficiently. SMC reports that the intervention has lessened severe flooding risk in the communities along these waterways — a claim backed by the sheer volume of material extracted.
Where the Ocean Cleanup Fits In
SMC’s dredging tackles settled silt and waste at the bottom of rivers. But a different problem moves on the surface: plastic flowing downstream from communities, markets, and industrial areas. That’s where the DENR’s five-year agreement with The Ocean Cleanup comes in.
Signed in 2026, the partnership calls for deploying Interceptor barriers at strategic points along the Pasig River and its tributaries. These solar-powered, automated systems are designed to capture high volumes of floating trash around the clock. The Ocean Cleanup had already deployed 21 such Interceptors across 10 countries and collected more than 52 million kilograms of trash from aquatic environments by April 2026. The Pasig River, with its heavy and continuous waste load, presents one of the most challenging deployments the organization has taken on.
The first Interceptor barrier will be installed in the Meycauayan River in Bulacan — a site chosen after surveys of nearly 100 locations. Additional sites along the Pasig River are being identified by the Pasig River Coordinating and Management Office under the DENR’s National Capital Region office. The Manila Bay Region, including the Pasig River system, is a key focus of The Ocean Cleanup’s 30 Cities Program, which aims to eliminate up to one-third of plastic flowing from rivers into the ocean before 2030.
DENR Undersecretary Jonas Leanes described the Pasig River as having carried the burden of consumption habits too long, calling the agreement “a decisive step” to stop it from being a pipeline of plastic to the ocean. The partnership complements Republic Act 11898, the Extended Producer Responsibility Act, which requires large companies to recover and recycle plastic packaging. Together, the law and the technology create a two-front strategy: holding producers accountable upstream while intercepting what already escapes downstream.
What Makes This Hard
River cleanup sounds straightforward — remove the garbage, restore the flow, done. In practice, every phase of this work runs into complications that aren’t obvious from the outside.
Scale and recurrence. The 8.5 million metric tons SMC removed didn’t accumulate overnight. It built up over decades, and unless upstream sources are controlled, some of that material will return. The Ocean Cleanup’s Interceptors can catch floating plastic, but they can’t stop the garbage from being dumped or washed into rivers in the first place. Cleanup and prevention have to run in parallel, which is why the Extended Producer Responsibility Act matters — it tries to shrink the flow at the source.
Coordination across jurisdictions. Rivers don’t follow administrative boundaries. The Pasig River flows through multiple cities and barangays, each with its own enforcement capacity and waste management system. The Tullahan crosses several Metro Manila districts. The Laguna rivers fall under provincial and municipal authorities. Aligning permits, schedules, and disposal protocols across all these entities is a logistical challenge that slows every phase of work. SMC coordinates with the DENR and LGUs on each waterway, but the process is rarely quick.
Technology adaptation. The Ocean Cleanup’s Interceptors were designed for rivers with specific width, flow, and debris profiles. The Pasig River carries an unusually heavy and continuous waste load, so the technology has to be adapted — not just dropped in. Surveys of nearly 100 sites were needed before the first deployment location could be confirmed. Even then, the system will require ongoing adjustment and local knowledge transfer to the Pasig River Coordinating and Management Office, which is part of the five-year agreement’s mandate.
Knowledge transfer as a bottleneck. The Ocean Cleanup partnership explicitly prioritizes equipping local authorities for long-term maintenance. That means training, data sharing, and baseline analysis — not just installing hardware. If the knowledge transfer doesn’t stick, the Interceptors could become expensive monuments rather than working solutions.
What Communities and Readers Can Do
These large-scale programs handle what individual action can’t. But they also create openings for community-level participation that makes the work last.
- 1Report clogged waterways to your LGUsLocal government units coordinate with the DENR on cleanup scheduling. When residents report specific blockages or illegal dumping sites, it helps prioritize which sections need attention first. Many LGUs have hotlines or mobile apps for environmental complaints.
- 2Support the Extended Producer Responsibility ActRA 11898 requires large companies to recover and recycle their plastic packaging. Consumers can check which brands comply and choose products from companies that meet their EPR obligations. Public pressure reinforces regulatory enforcement.
- 3Join or organize community cleanupsWhile SMC and The Ocean Cleanup handle the heavy lifting, barangay-level cleanups along riverbanks prevent garbage from entering the water in the first place. These are most effective when coordinated with local waste collection schedules so that collected debris is properly disposed of, not left on the bank.
For readers who want a deeper look at how community-led action complements these large programs, local cleanup initiatives across the archipelago show what organized residents can achieve with minimal resources. Youth groups, in particular, have been driving riverbank restoration and waste segregation campaigns that directly reduce the load on formal cleanup operations — young Filipino leaders are increasingly taking on pollution in their own communities.
Frequently Asked Questions
Who funds the SMC river cleanup? â–ľ
How does The Ocean Cleanup’s Interceptor work? â–ľ
Which rivers have been cleaned so far? â–ľ
What is the Pasig Bigyang Buhay Muli project? â–ľ
How does the Extended Producer Responsibility Act help? â–ľ
Will the cleanup prevent flooding permanently? â–ľ
Where will the first Interceptor be deployed? â–ľ
Can local communities participate in these efforts? â–ľ
What to Watch For Next
The next milestone to track is the deployment of the first Interceptor barrier in the Meycauayan River, which will test how well The Ocean Cleanup’s technology handles Philippine conditions after surveys of nearly 100 sites. On the SMC side, the two additional Laguna rivers scheduled for cleanup will show whether the program can maintain its pace after already removing over 8 million metric tons of material. The longer-term question — whether the Extended Producer Responsibility Act and local enforcement can prevent reaccumulation — will determine whether these rivers stay clean or need to be cleaned again. If this was useful, you might also want to read how innovative waste management approaches are reshaping the Philippines.
Sources
Cleaning the archipelago: community action against water pollution — A closer look at how local groups complement large-scale cleanup programs across the country.
Philippines youth leaders fight pollution — How young Filipinos are organizing riverbank restoration and waste segregation campaigns in their own communities.
DENR, The Ocean Cleanup forge strategic alliance to purge plastic waste from Pasig River. Manila Bulletin, 2026.
