Borehole Drilling
Stellenbosch

Two things drive borehole projects here, and they pull in different directions. Domestic properties want garden irrigation. Farms and estates want sustained seasonal volume, which puts them squarely in water use authorisation territory.

The ground is granite and Malmesbury rock, so yield is a fracture question rather than a depth question.

What Is Under Stellenbosch

Formation	Where it sits	What it means for drilling
Cape Granite Suite	The Stellenbosch batholith underlies much of the town and surrounding farmland	Water sits in the weathered mantle and in jointing at the contact zones. Depth to fresh rock is unpredictable between properties.
Malmesbury Group	Much of the lower-lying farmland and the ground west toward the N1	Modest yields as a rule, with the productive holes being those that intersect fault and shear structures. Salinity can be elevated.
Table Mountain Group	Jonkershoek, the Simonsberg and the surrounding mountains	Fractured quartzitic sandstone and the principal recharge for the valley. High yields where fractures are intersected.
Alluvium	Along the Eerste River and its tributaries	Shallow, permeable, and more exposed to agricultural surface influence including nitrate.

What That Means for Your Borehole

• Siting matters more than depth. The productive holes are the ones that hit structures, so a geophysical survey is worth doing before committing to a per-metre rate.
• Farm boreholes need extended testing. Sustained irrigation abstraction behaves very differently from a short domestic test.
• Nitrate is worth testing for on ground near working farmland, alongside the usual salinity parameters.
• Cumulative abstraction is a live issue where several boreholes on a farm draw from the same ground. Individually sustainable rates can be collectively unsustainable.

Where We Work Around Stellenbosch

• Stellenbosch central, Mostertsdrift and Brandwacht
• Jonkershoek and the properties up the valley
• Devon Valley, Vlottenburg and the wine farms west of town
• Koelenhof, Klapmuts and Muldersvlei
• Idas Valley and Paradyskloof
• Lynedoch, Raithby and the smallholdings toward the R310
• Kayamandi and Cloetesville

What to Watch For Here

Water use authorisation is the critical path on any farm project. Irrigation abstraction goes well beyond Schedule 1 domestic use, and the DWS registration or licensing process takes time. Start it early, because a drilled borehole you may not legally use at the volume you need is an expensive asset.

Nitrate and agricultural influence. Shallow groundwater near cultivated land can carry elevated nitrate, a genuine health parameter rather than a nuisance one. It needs specific treatment, not general filtration. Test before any domestic use.

What the Water Is Used For

• Vineyard and orchard irrigation, where sustained seasonal yield is the constraint
• Estate and guest farm landscaping
• Cellar washdown and process water, which sets its own quality requirements
• Large residential gardens on the older stands
• Student accommodation and guesthouse supply, where continuity matters
• Livestock and smallholding supply toward Klapmuts and Lynedoch

Wellpoint or Borehole?

Not viable across most of the area. Granite and Malmesbury rock offer nothing for a driven point, and the water table generally sits below suction lift. Alluvial ground along the Eerste River is the only setting where a shallow point might work, and even there quality is a real concern given surrounding land use.

Registration and Abstraction

This area falls under Stellenbosch Municipality rather than the City of Cape Town, so local registration requirements and by-law conditions are that municipality's. This catches people out when they read Cape Town borehole guidance and assume it applies. Estates and farms often add their own conditions on top.

Abstraction itself is governed by the National Water Act. Reasonable domestic use generally falls under Schedule 1, but irrigation and commercial volumes usually require registration or a water use authorisation from the Department of Water and Sanitation. Confirm both before drilling.

Related Services

For the drilling process itself, the geology across the wider metro and how a quote is put together, see Borehole Drilling Cape Town.

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	R500 - R1,200 /m	Granite and Malmesbury rock drill slowly. Farm boreholes at larger diameter cost more per metre again.
uPVC casing, installed, per metre	R400 - R700 /m	Diameter and class. Weathered-zone thickness is not known until drilling starts.
Mobilisation and site establishment	R2,500 - R9,000	Farm access is usually straightforward; add DWS authorisation time and cost to the programme.
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	R90,000 - R250,000+	Everything above, excluding treatment, which depends entirely on the water analysis.

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