Short answer. The water you artificially bring to the surface belongs to you. Article 513 of the Civil Code states that waters artificially brought forth belong to the person who brought them up. The effort and investment you made in extracting the water establishes your ownership of it.
What the law says
Waters artificially brought forth in accordance with the Special Law of Waters of August 3, 1866, belong to the person who brought them up.
Civil Code, Article 513 — Waters Artificially Brought Forth. Read the full provision →
Ownership follows the effort to extract
Underground water, before it is brought to the surface, does not automatically belong to the owner of the land above it. Article 513 of the Civil Code establishes a clear rule for water that someone actively extracts through artificial means — digging, pumping, drilling, or any other human effort that brings underground water to the surface: that water belongs to the person who did the work of bringing it up. This is sometimes called the principle that rewards the effort invested in extracting a resource that would otherwise remain inaccessible.
The reference to the Special Law of Waters
Article 513 anchors its rule in the Special Law of Waters of August 3, 1866, a colonial-era statute that provided the foundational rules on water rights in the Philippines. This cross-reference means the ownership right Article 513 grants is not unconditional — it applies when the extraction is done in accordance with that law. Modern water use in the Philippines is also regulated by subsequent legislation governing water appropriation and use. The Special Law of Waters established the legal framework under which private extraction of underground water creates ownership; the Civil Code then states that ownership belongs to the extractor within that framework.
The right is subject to regulation
Owning the water you bring up does not mean you can extract unlimited amounts without restriction. Water use in the Philippines is subject to regulatory requirements, including the National Water Code and permits from the relevant government authority for significant water extraction. The ownership Article 513 establishes operates within this regulatory environment: you own what you validly extract, but the right to extract may require permits and must not violate applicable rules on water allocation and environmental protection. Residential wells for household use are treated differently from large-scale agricultural or industrial extraction, and the applicable requirements depend on the volume and purpose of use.
What happens if you stop using the water
Your ownership of the water you bring up is tied to your continuing exercise of the extraction. If you abandon the water — meaning you stop extracting it and allow it to flow freely into the natural course — Article 514 of the Civil Code provides that it becomes public dominion water at that point. The act of abandonment ends your private ownership. This means the ownership Article 513 creates is not permanent in the way ownership of land is; it lasts as long as you are actively exercising the right to bring the water up. Letting the water flow away unclaimed effectively releases it back to the public domain.