Sandton sits on the Johannesburg Dome granite. Most stands have a cover of decomposed, sandy granite over hard fresh rock, and water is usually found in the fractured zone where the two meet rather than in the rock itself.
Two very different kinds of property share the name. Sandhurst, Sandown and Inanda have generous gardens with room for a rig, while the high-rise CBD around Sandton City needs careful planning around basements, parking and building management.
What Is Under Sandton
| Formation | Where it sits | What it means for drilling |
|---|---|---|
| Johannesburg Dome granite and gneiss | The basement rock under the whole suburb, part of the Kaapvaal Craton | Hard, slow drilling once fresh rock is reached. It holds water only in joints, fractures and quartz veins, so the hole has to intersect them to produce. |
| Decomposed granite (saprolite) | The upper few metres to tens of metres on most stands | Drills quickly but is unstable, sandy and clayey. It has to be cased off, and its thickness sets the casing length. |
| Diabase dykes and quartz veins | Narrow intrusions cutting the granite, often aligned with valleys and spruits | The fractured margins of a dyke are a favoured drilling target. A survey looks for exactly these linear features. |
Send your street and what the water is for, and get an itemised quote for Sandton.
Get a Sandton Borehole QuoteWhat That Means for Your Borehole
- The water is usually at the weathered-to-fresh transition or in fractures below it, rather than at any fixed depth.
- Casing length follows the decomposed granite which varies across a single stand.
- Yields are typically modest to moderate which suits garden irrigation with storage better than high continuous draw.
Where We Work Around Sandton
- Sandhurst and Sandown
- Sandton CBD towers near Sandton City
- Benmore Gardens
- Strathavon and Atholl
- Wierda Valley
- Inanda and Hurlingham
- Gautrain station precinct
What to Watch For Here
Commercial sites bring extra paperwork. Office blocks, hotels and retail centres in the Sandton CBD often draw more water than a household, so the use may fall outside Schedule 1 and need registration or a licence from DWS. Building managers also have to plan around basements, services and loading bays before a rig can set up.
Big Sandhurst gardens are not automatically good targets. A large stand gives freedom to choose a spot, but mature trees, pools, staff quarters and buried irrigation lines still narrow the options. Picking a site away from old soakaways and close to a likely fracture matters more than simply drilling in the most open stretch of lawn.
What the Water Is Used For
- Irrigating large established gardens in Sandhurst and Sandown
- Topping up swimming pools during dry Highveld winters
- Landscaping and water features at Sandton office parks
- Standby supply when Sandton mains pressure drops
- Washing paved driveways and courtyards without using mains
Wellpoint or Borehole?
Rarely. Decomposed granite can look sandy, but it is mixed with clay and the water table usually sits well below suction lift. Only a thin strip of alluvium beside a spruit might suit a driven point. A drilled borehole is the realistic route here.
Approval and Abstraction
Sandton falls under the City of Johannesburg. Both main metros require approval before drilling. The City of Johannesburg requires an application to its Environment and Infrastructure Services Department, and an approved application comes with a drilling certificate that has to be kept on site while the rig works; drilling without one risks a fine and impoundment of equipment. The City of Ekurhuleni requires authorisation, with applications reviewed by its Dolomite Section and by Water Demand Management. Elsewhere, including Mogale City, confirm the municipality's current requirements. Separately, the National Water Act governs how much you may abstract: reasonable domestic use generally falls under Schedule 1, and in 2026 the Department of Water and Sanitation confirmed that households using borehole water for reasonable domestic purposes do not need to register nationally. Commercial, agricultural and larger abstraction may need registration or a water use authorisation. Rules change, so confirm the current position before drilling.
Related Services
For the drilling process itself, the geology across the wider area and how a quote is put together, see Borehole Drilling Johannesburg.
Nearby Areas
Borehole Prices in This Area
Drilling is charged per metre, so depth drives the total. The ranges below are framed for local ground conditions and access.
| Item | Indicative range | What moves it locally |
|---|---|---|
| Drilling, per metre | R450 - R1,100 /m | Decomposed granite drills quickly; fresh granite is slow and wears bits. The split between the two on your stand sets where the cost lands. |
| uPVC casing, installed, per metre | R400 - R700 /m | The depth of decomposed granite decides how much casing is needed, and it changes across short distances. |
| Mobilisation and site establishment | R2,500 - R9,000 | Access and site conditions move this; a site visit settles it before quoting. |
| Water survey | R5,000 - R12,000 | Targets structure rather than depth. Worth most where yield is fracture-dependent. |
| Yield testing | R3,500 - R15,000 | Establishes the sustainable rate that pump selection depends on. |
| Pump, supplied and installed | R15,000 - R45,000 | Greater depth means more head, which means a larger pump and heavier cable. |
| Storage and booster | R12,000 - R35,000 | Needed wherever peak demand exceeds the borehole's sustainable rate. |
| Typical complete project | R60,000 - R180,000+ | Everything above, excluding treatment, which depends entirely on the water analysis. |
These are indicative ranges, not a quotation. They are compiled from published South African supplier and contractor pricing to give you a starting point for budgeting. They are not our rate card, and no figure here is a commitment.
Treat them as a broad guide only. Published borehole pricing in South Africa varies enormously - 2026 guides quote per-metre drilling rates for Gauteng ranging from under R300/m to R1,500/m, a spread of more than five to one - because depth, geology, access, specification, distance and fuel costs all move the number. Depth in particular is not known until the hole is finished. Figures generally exclude VAT unless noted, and change over time. Only an itemised written quote against your actual site means anything.
Sandton Borehole FAQs
Why does drilling in Sandton start fast and then slow down?
The upper part of the hole usually passes through rotten, weathered granite, which cuts quickly but can collapse, so it is cased. Below that the bit meets fresh granite, which is far harder and slows penetration noticeably.
The useful water typically sits in the transition between those layers and in joints below it, so the drilled depth depends on what each individual hole actually encounters on the day.
Can an office building near the Sandton CBD have its own borehole?
Often it can, if there is a workable spot for the rig and the landlord or body corporate agrees. Basements, underground parking and dense services are the usual constraints on a commercial plot in the node.
Larger commercial abstraction may need a national water use registration or authorisation, which is separate from the Joburg pre-drilling application, so it pays to check both early in planning.
Is borehole water safe to use around Sandhurst homes with old septic history?
Granite groundwater here is usually good and fairly soft. The main risk is nitrate or bacteria from old soakaways and septic systems, which some older Sandhurst and Sandown properties relied on before sewer connections.
A laboratory water test after drilling is the sensible step, especially if the water will be used for anything beyond irrigating the garden or topping up the pool.
What should a Sandton homeowner expect on cost and yield?
Neither can be fixed in advance. Granite yields here tend to be modest to moderate and can differ sharply between neighbouring stands, while cost follows depth, casing and the pump that suits the result.
A quote should explain those variables honestly. There is no guarantee of a particular volume from any hole, and anyone promising one is guessing.
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