Indicator C1 — Contractor Concentration (Flood Control)

AI-verified / Na-verify ng AI Data as of October 22, 2026

Contractor Concentration (Flood Control)

A contractor holds a very large share of flood-control contract value in a district or province.

This is a statistical anomaly or indicator worth examining — not proof of wrongdoing, fraud, or corruption against any person.

Indicator: E F CHUA CONST INC received 26.8% (₱450.36M of ₱1.68B) of recorded flood-control contract value in MAKATI CITY across 34 contracts and 12 contractors, at or above the 25% share threshold (HHI 0.109). This may be due to the contractor's strong track record or specialization in flood-control projects in Makati City.

Public record entityE F CHUA CONST INCOrganization record →

LocationMAKATI CITY

Amount₱450,359,445.2526.8% of peer-group contract value in public records sumbong source

Only contractors and government agencies named in public procurement records are shown. Private individuals are not named.

How this was checked

publish · confidence 0.98

Model: gpt-4.1

Prompt: v4.1

Checked: October 22, 2026

The contractor E F CHUA CONST INC holds 26.8% of the total flood-control contract value in Makati City, which is above the 25% threshold and meets the minimum contract count. The evidence is complete, and the indicator is genuinely unusual relative to the supplied baselines. The HHI is below the 0.25 threshold, but the share percentage is the primary trigger for this rule. There is no data artifact or evidence of different legitimate works that would invalidate the indicator.

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Project completion

Schedule fields from DPWH transparency portal records and the Sumbong sa Pangulo flood-control list — not inferred beyond those columns.

Flagged peer group: MAKATI CITY

Reported complete (DPWH): 7Ongoing: 0Delayed: 0Status unknown: 0

Project	Prog.	Target end	Actual end	Days late	Status
Construction of Drainage Main along A.P. Reyes Avenue (South Bound) from H. Santos St. Drainage Main towards J.P. Rizal Avenue, District I, Makati City, Metro Manila22OC0180Flood control	100%	December 18, 2022	December 13, 2022	No target date from DPWH, so lateness cannot be computed	completedsumbong source
Construction of Drainage Main along Chino Roces Avenue from Calatagan Creek towards Buendia Avenue, Makati City, Metro Manila21OC0028Flood control	100%	October 8, 2021	August 22, 2022	No target date from DPWH, so lateness cannot be computed	completedsumbong source
Construction of Drainage Main along A.P. Reyes Avenue (North Bound) from H. Santos St. Drainage Main towards J.P. Rizal Avenue, District I, Makati City, Metro Manila22OC0005	100%	December 13, 2022	October 24, 2022	No target date from DPWH, so lateness cannot be computed	completedsumbong source
Construction of Drainage Main along H. Santos St. towards Barangay Carmona Pumping Station Including One (1) Unit Additional Pump and Sump Pit with Accessories, Barangay Carmona, Makati City22OC0013	100%	December 13, 2022	December 13, 2022	No target date from DPWH, so lateness cannot be computed	completedsumbong source
Construction of Revetment Wall Along Maricaban Creek Makati Side (Phase 5), Makati City22OC0007	100%	November 13, 2022	November 13, 2022	No target date from DPWH, so lateness cannot be computed	completedsumbong source
Construction of Revetment Wall Along Maricaban Creek Makati Side (Phase 6), Makati City22OC0008	100%	November 13, 2022	November 13, 2022	No target date from DPWH, so lateness cannot be computed	completedsumbong source

Show 1 more project in this bucket

Rehabilitation of Drainage Structure along J.P. Rizal Street (including Sidewalk and Driveway) Phase 2, District I, Makati City24OC0084

100%

November 19, 2024

No target date from DPWH, so lateness cannot be computed

completedsumbong source

Rule Definition

Share of contract value by contractor within DEO or province; flags top share > 40% or elevated HHI.

Triggering Data & citations

Contractor holds a large share of flood-control contract value in its district/province

{
  "hhi": 0.10851656457337085,
  "scope": "province",
  "bucketKey": "province:MAKATI CITY",
  "contractor": "E F CHUA CONST INC",
  "thresholds": {
    "share": 0.25,
    "minContracts": 3,
    "minBucketContracts": 10
  },
  "bucketTotalPhp": 1682878404.25,
  "contractorShare": 0.2676125881184562,
  "contractorTotalPhp": 450359445.25000006,
  "contractorContracts": 7
}

Source documents

sumbong — https://raw.githubusercontent.com/rukku/sumbongsapangulo.ph-datasets/main/flood_control_projects.geojsonFetched October 21, 2026

Possible Innocent Explanations

This may be due to the contractor's strong track record or specialization in flood-control projects in Makati City.

Project completion

Rule Definition

Triggering Data & citations

Possible Innocent Explanations

Where this contractor works