If a private contractor builds public infrastructure, does the water within its operational zone become public property?

This is one item in a broader list of public waters

Article 502 lists nine categories of waters that belong to public dominion — rivers, springs and brooks, waters on public lands, lakes formed by nature on public lands, rainwaters in ravines, subterranean waters on public lands, waters within public works zones, waters leaving certain lands, and waste waters of fountains and sewers. Waters within the zone of operation of public works sit in the middle of that list, but the rule that applies to them is the same across the whole article: once a water source falls into one of these categories, it belongs to the public rather than to any private owner.

Why the contractor's role does not matter

The article addresses the exact scenario in the question directly: it applies to public works even if constructed by a contractor. Public infrastructure — roads, waterworks, irrigation systems, and similar projects — is very often physically built by private construction companies under contract with the government. Article 502 makes clear that this arrangement does not privatize the water found within the zone where those works operate. The infrastructure remains public in character for this purpose regardless of who poured the concrete or laid the pipes.

What determines the classification

The trigger under this clause is the water being found within the zone of operation of the public works — not who owns the land beneath it, and not who was hired to build it. This distinguishes it from land ownership questions entirely: a private contractor who built the works, or even a private landowner whose property adjoins the works, does not thereby acquire private rights over water that falls within that operational zone. The classification tracks the public nature of the works themselves.

Cases citing this provision

These Supreme Court decisions cite the provision above. We list them so you can read them yourself; the summaries of what each decided are not ours to give.

• Republic of the Philippines vs. Arcadio Ivan A. Santos III, et al, G.R. No. 160453, November 12, 2012 — read the decision on LawPhil →
• Pilar Development Corporation vs. Ramon Dumadag, Ronaldo Bacabac, et al, G.R. No. 194336, March 11, 2013 — read the decision on LawPhil →
• Filinvest Land, Inc. vs. Flood-affected Homeowners etc., et al, G.R. No. 165955, August 10, 2007 — read the decision on LawPhil →
• Pelbel Manufacturing Corporation, et al. vs. Hon. Court of Appeals, et al, G.R. No. 141325, July 31, 2006 — read the decision on LawPhil →

Related provisions

• Civil Code, Article 502 — Waters Of Public Dominion