Service · Koh Samui
Deep Well Drilling on Koh Samui
We drill cased, sealed water wells for villas, developments and resorts across Koh Samui — through granite ridges, laterite and coastal sediment. Every project starts with the geology of your specific plot and ends with a measured, documented water source.
Useful to send: the plot location (a map pin is enough), what you are building, and any wells you know of on neighbouring plots.
Who this service is for
- New builds on plots without a reliable mains connection
- Villas currently depending on tanker deliveries
- Owners of shallow wells that weaken or dry out in high season
- Developers planning shared water infrastructure for multiple units
How it fits together
From survey to a documented water source
A drilling job is five stages. The price depends on the first one more than most owners expect.
Survey the plot
Geology, rig access, the drilling point and its distance from septic and drainage.
Drill to stable water
Depth is set by what the cuttings and water strikes show on the day, not by a promise made in advance.
Case, screen and seal
Casing through loose ground, screen at the water zone, grout seal at the surface.
Develop and test-pump
Clean the bore, then measure what it sustains and how far the level draws down.
Pump, test and record
A pump sized from the test, a laboratory water analysis and an as-built record you keep.
Service · Koh Samui
Common symptoms & problems
The first water isn't the right water
Shallow layers look promising in wet season and vanish in March. We drill to aquifers below the seasonal water table.
Unsealed boreholes contaminate
A well without a proper surface seal is a channel for runoff into your drinking water. Sealing is not optional in our scope.
Wrong casing shortens well life
Undersized or badly joined casing collapses or lets fines in. We specify casing for the geology, not the cheapest bill of materials.
No yield data means guesswork sizing
Pumps and tanks bought before the yield is measured are a gamble. We measure first, then specify.
Service · Koh Samui
What we check before we quote a well
Geology & terrain
Surface rock, slope and whatever is known of the local strata.
Rig access
The route and working space a drilling rig needs to reach the point.
Neighbouring wells
Depths and yields of nearby wells, where that information exists.
Plot layout
Setbacks from buildings, boundaries and any septic systems.
Drilling point
The location that balances geology, access and your site plan.
Service · Koh Samui
What the service includes
Site survey & drilling-point selection
Geology, access for the rig and what's known about neighbouring wells — before anything is committed.
Rotary drilling to a stable aquifer
We drill past seasonal shallow layers to water that holds through the dry months.
Casing & gravel pack
Casing specified for the geology, with a gravel pack that keeps sediment out and yield stable.
Surface seal & wellhead
The annulus is sealed so surface water and contamination cannot migrate into the aquifer.
On-site yield measurement
Flow is measured at the well before any pumps or tanks are specified — sizing follows data.
Documentation & as-built records
Depth, casing, yield and construction details — the paperwork the next owner will thank you for.
How it works
Site survey
We walk the plot, assess geology and access, and agree the drilling location with you.
Fixed drilling plan & quote
Target depth, casing specification and an itemised fixed price — in writing before the rig mobilises.
Drilling & yield test
The borehole is drilled and yield measured on site. If geology differs from expectation, you hear it before we proceed.
Casing & sealing
Casing, gravel pack and surface seal installed — the workmanship that decides how long the well lives.
Handover documentation
You receive the well records, measured yield and our recommendations for equipment sizing.
Service · Koh Samui
Important technical considerations
- Aquifer depth and yield vary by location and can't be known with certainty before drilling — a survey reduces the risk but doesn't remove it.
- Casing specification follows the geology: the right material and diameter for the ground, not a fixed recipe.
- The surface seal is what keeps contamination out of the aquifer, so it is never left out of our scope.
- Granite and hard strata drill more slowly than sediment, which affects the schedule.
- Yield is measured on site before any pump or tank is specified.
Service · Koh Samui
What affects cost & timeline
- The final depth reached — deeper wells cost more and take longer.
- Geology: hard rock is slower and harder on tooling.
- The casing material and diameter your ground requires.
- Rig access and any site preparation needed.
- Permitting and documentation that apply to your plot.
Site conditions vary from plot to plot, so we quote a fixed, itemised price after the site assessment — never a fixed figure beforehand.
Before you decide
Guides from the field
Most questions owners ask before a drilling quote are answered in these guides.
Frequently asked questions
How deep does a well on Koh Samui need to be?
Most wells on the island reach between 30 and 120 metres, depending on location and geology. We confirm a target depth during the survey and drill to a stable aquifer rather than stopping at the first water.
Can you guarantee you'll find water?
No honest driller can guarantee yield before drilling. What we can do is reduce the risk with a proper survey, tell you what we know — and what we don't — before the rig arrives, and measure everything once the borehole is down. You'll never be asked to decide on missing information.
Do I need a permit to drill?
Groundwater use in Thailand is regulated and requirements depend on depth and usage. We advise on what applies to your plot and handle the documentation as part of the project.
How long does drilling take?
Drilling itself typically takes several days, depending on depth, geology and access. The full sequence from survey to documented handover is agreed as a timeline in your quote.
What do you need from me before you can quote a well?
The plot location, what is being built and roughly how many people the property serves. Plans help but are not required. We confirm access and geology on a site visit, then quote the well as fixed, itemised lines.
What happens if the first hole does not find enough water?
We explain the options on site before anything else is spent: drilling deeper where the geology supports it, completing the well for a lower yield with more storage, or moving to a second point. How a dry or weak hole is charged is written into the quote beforehand, not decided afterwards.
Send us the plot, and we will tell you what it allows
A location pin, what you are building and how many people it serves are enough to start. We review access and geology, visit the site and quote the well as fixed, itemised lines.
Send plot details