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Good practice Imported

Estero de San Miguel — Manila's Phytoremediation-Led Waterway Rehabilitation

Philippines · Manila · See the Philippines profile · See the Manila profile

Evidence: Observational / pre–post Top 89% 27/100 · Ask Evidence Copilot about this practice

The Pasig River Rehabilitation Commission spent ₱52 million dredging and phytoremediating Manila's 2.3 km Estero de San Miguel with vetiver-planted floating islands, earning DENR's 'Most Improved Estero' award — though sister waterways nearby remain neglected.

2.3 km
Waterway length rehabilitated
52 million PHP (~US$1 million)
Programme spend on dredging
100+ families
Riverside families relocated
20+ esteros
Esteros targeted under DENR-MPIC accord

Details

Promoter
Pasig River Rehabilitation Commission (PRRC) / DENR-NCR
Period
2012–2022
Keywords
urban water management, waterway rehabilitation, phytoremediation, wastewater

Context

Manila's esteros — the city's historic tidal waterway network — became heavily polluted urban drains lined with informal settlements over the 20th century. DENR and city agencies have since targeted at least 20 of the dirtiest esteros for rehabilitation under a joint DENR–MPIC accord.

Activities

On the 2.3 km Estero de San Miguel, the Pasig River Rehabilitation Commission spent approximately ₱52 million (roughly US$1 million) on dredging, relocated more than 100 riverside families, and installed floating islands of vetiver grass and ornamental vegetation for phytoremediation — using plants to filter sediment and absorb heavy metals — alongside new linear parks along the banks.

Results

DENR-NCR named Estero de San Miguel Metro Manila's 'Most Improved Estero' at the 2nd Gawad Taga-Ilog awards (2021–2022), citing visible before-and-after improvements in water clarity after decades during which the waterway was covered in floating trash. An independent academic assessment of Manila's esteros network (covering landscape change from 2019–2024) found mixed results system-wide: riverside green patches increased and fragmentation decreased in rehabilitated stretches, but other esteros in the same network, such as Estero de Vitas, remain largely neglected.

Conclusions

Analysts and local reporting attribute the gap to short-term programme targets rather than sustained maintenance funding — a caution worth weighing against the San Miguel result.

Implementation
Indicative cost
Medium (€50k–€500k) — Approximately ₱52 million (~US$1 million) spent on dredging for the 2.3 km stretch; broader programme-wide or per-estero costs are not published.
Time to results
Medium (1–3 years) — Recognised as 'Most Improved Estero' for 2021–2022; the independent landscape assessment covers 2019–2024.
Staffing & skills
Pasig River Rehabilitation Commission (PRRC) — dredging and rehabilitation delivery, DENR-NCR — recognition/oversight, City of Manila and other DENR–MPIC joint accord partners

Conditions for success

  • Dredging combined with phytoremediation (floating islands of vetiver grass and ornamental vegetation) to filter sediment and absorb heavy metals
  • Relocation of riverside informal-settler families (100+) to reduce ongoing pollution loading
  • New linear parks along the banks to support community stewardship

Common failure modes

  • An independent 2019-2024 landscape assessment found other esteros in the same network (e.g. Estero de Vitas) remain largely neglected
  • Analysts attribute the gap to short-term programme targets rather than sustained maintenance funding
  • No quantified pollutant-reduction metrics have been published for Estero de San Miguel itself

Where it fits

Governance type
national environmental agency (DENR) plus a dedicated river rehabilitation commission (PRRC), with city government coordination
Scale
single 2.3 km waterway within a citywide 20+ estero programme
Income level
lower-middle-income (Philippines)

Commonly funded by

National / regional programmes

Indicative funding routes for practices of this type — always check each programme's current calls and eligibility rules.

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Data sources

Where this practice's information was retrieved from, and when.

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