Siargao Water

Who we are · On-island · Independent

Know what's under your land before you drill.

We're two independent locals running US-developed seismoelectric technology: we read your ground for depth, an indicative yield range, and saltwater risk, in writing, before the rig moves. We own no rig, so the read is straight, and that's exactly why people trust the report.

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Our story

Why two surfers started a water company.

We are two surfers driven by a deep connection to the island we call home. The same mountains, rivers, and coastline that shape our adventures are the places we are committed to protecting. That's why we specialize in non-destructive geophysical water surveys, using advanced technology to locate groundwater without unnecessary disturbance to the land. Every survey is guided by a simple belief: the best way to discover nature's resources is to work with nature, not against it.

Around here, finding water usually means drilling and hoping. Sometimes it works. Sometimes the well comes up dry, or turns salty after the first dry season, so you dig again. On an island where fresh water is already stretched thin, that gets expensive fast.

We think there's a better way. Before any rig shows up, we read what's under your land and tell you plainly: how deep the water likely sits, how much it might give, and whether salt is a risk. You get it in writing. We don't drill and we don't sell rigs, so our read stays straight. Something solid to build on, not a guess.

Siargao Island · where we live, surf, and survey

Who we are

The two of us.

Cito de Leon

Co-Founder

As Co-Founder, Cito brings together a passion for the outdoors with years of experience in geophysical technology. An avid surfer and wellness enthusiast, he believes that a healthy lifestyle begins with a healthy environment. His expertise in supplying advanced geophysical instrumentation has helped make modern, non-destructive groundwater exploration more accessible and effective. Naturally curious about the patterns and forces that shape both the world around us and our place within it, he approaches his work with open-mindedness and a deep respect for nature.

Jay Sueno

Co-Founder

As Co-Founder, Jay brings together a passion for technology, wellness, and the natural world. A surfer, family man, and the founder of Vultun Wellness, he believes that caring for people and caring for the environment go hand in hand. With expertise in AI, data science, and geography, he combines analytical thinking with a curiosity about the deeper patterns that shape our world. Through the company, Jay is committed to advancing sustainable, non-destructive water exploration that serves communities while respecting the landscapes they call home. Learn more at jaysueno.com.

The method, in plain language

What a seismoelectric survey actually reads.

A seismoelectric survey sends a small, controlled seismic pulse into the ground. When that pulse passes through water-saturated, permeable rock, the movement of water against the mineral grains generates a tiny electrical signal that sensors at the surface record. The strength and timing of that signal indicate the depth, thickness, and likely productivity of a water-bearing layer.

The seismoelectric effect is documented in peer-reviewed geophysics: Thompson and Gist (1993) detected a response from a fluid interface at about 300 m, and Pride (1994) established the governing theory. The method is still studied today. The signals are small and interpreted, so operator experience and site-specific judgment matter, and we report a confidence level rather than a promise.

Non-invasive · no drilling · no chemicals
The ground a survey reads

How strong each reading is

The honesty hierarchy of a seismoelectric read.

A seismoelectric survey gives you a genuinely strong read on what's underground. Some parts of it are firmer than others, and we tell you exactly which, with a confidence rating on every line. Here's how much weight each part of the report carries.

Depth Strong

Our strongest, most reliable read. Depth-to-water is what the method pins down best.

Thickness Solid

A solid estimate of how thick the water-bearing layer is.

Yield Indicative

A dependable range for likely productivity, rather than a single promised number.

Saltwater Clear read

A clear read on saltwater-intrusion risk at the time of survey.

Our promise

We give it to you straight.

We read your land without touching it, interpret what's there, and put it in writing. We own no rig and we don't drill, so nothing tilts the read toward a hole. No one can promise water that's still underground, but we can tell you the odds and point you at the best place to drill. We aim for one precise hole instead of a field of dry ones, because we live here and the island's water is worth protecting.

We survey without touching your land.

No holes, no excavation. We read what's under your land, interpret it, and write down the limits.

One precise hole, not a field of dry ones.

We recommend a registered driller for the drilling, and aim to point the rig at the one spot most likely to work.

Because we live here.

The island's water is worth protecting. We complement government and academic services, and respect the dowsers and drillers who came before us.

The trajectory

We're building toward end-to-end support for your water decision, starting with the survey.

Survey now, and over time, from your land to water in your tank.

Straight answers

Questions people ask before they drill.

What kind of soil and geology is underneath the ground in Siargao?

Siargao is predominantly karst limestone, sitting on an older volcanic and ophiolite basement, with no significant surface drainage because water disappears into underground channels. A peer-reviewed 2025 geological study describes the basal rocks as limestone karst over a Late Cretaceous ophiolite basement, with a volcanic formation in the island's center. The practical meaning for a well: in karst, water travels through fractures, conduits, and dissolved channels rather than evenly through the rock, so yield and quality can change sharply over short distances. That is the core reason the exact spot you drill matters, and why we read your specific parcel rather than quote an island-wide number.

How deep is the water table on Siargao or in General Luna?

There is no single water-table depth for Siargao, because it varies a lot by location across the island's karst. The island is limestone over a volcanic basement, where water moves through uneven fractures, so depth can change sharply from one lot to the next, and near the coast a freshwater lens sits on salt water. That is why an island-wide number would mislead you. The reliable figure for your build is a measured estimate of your own parcel, which we provide: the most likely depth, an indicative yield range, and saltwater risk, in writing.

What are the main issues you face when searching for water in Siargao?

The two big challenges on Siargao are unpredictable karst geology and coastal saltwater intrusion. In karst limestone, water moves through uneven fractures and conduits, so a productive aquifer and a dry zone can sit a few meters apart. Near the shore, fresh water floats as a thin lens on salt water, so a well can come up brackish or turn salty in the dry season when demand peaks. On top of that, the island already sees dry-season shortages and springs that drop in summer. We read these conditions on your land and put the most likely depth, an indicative yield range, and salt risk in writing, so you drill on data.

Why should I trust a water survey that is independent from the drilling company?

We own no rig, so the read is straight. A read that comes from whoever sells the drill has an incentive to recommend drilling; ours has none. Our written report reflects only what your parcel actually reads, which is exactly what an owner doing diligence, a lender, and an NWRB file want. The deliverable is the same regardless of the outcome: most likely depth, indicative yield range, saltwater risk, recommended location, and confidence. Independence is the whole point: the numbers we hand you are the numbers your ground shows.

Free Risk Snapshot

Thinking about a well? Start with a free Risk Snapshot.

Tell us about your site. We'll come back with a straight read on what to expect before you commit to a drill. No obligation, and nothing oversold.

Get your free Risk Snapshot See how a survey works