Stilbaai sits on coastal limestone and sand around the Goukou estuary, which is a genuinely different aquifer from the sandy towns further east.
Limestone means solution cavities and variable results over short distances.
What Is Under Stilbaai
| Formation | Where it sits | What it means for drilling |
|---|---|---|
| Quaternary coastal sand | The dune cordon and the flatter ground behind it | Unconsolidated and permeable with a relatively shallow water table. Boreholes need screening and a gravel pack; a wellpoint is often possible. |
| Calcrete and cemented horizons | Within and beneath the sand sequence | Hard cemented bands inside otherwise loose ground. They slow drilling, complicate the casing decision and are not predictable in advance. |
| Bokkeveld Group shale | The basement beneath the cover across the coastal platform | Generally modest yields with salinity often elevated. Productive holes are those that intersect fracturing. |
Send your street and what the water is for, and get an itemised quote for Stilbaai.
Get a Stilbaai Borehole QuoteWhat That Means for Your Borehole
- Finding water is usually straightforward; quality and sustainable volume are the real questions.
- Salinity belongs in every analysis given the coastal setting and the Bokkeveld basement.
- Proper screening and a gravel pack are what stop a sand borehole filling itself in.
Where We Work Around Stilbaai
- Stilbaai East and West
- The Goukou estuary margins
- Melkhoutfontein approaches
- Jongensfontein and the coastal road
- Holiday and retirement developments
- Smallholdings on the surrounding flats
- Riversdale-side approaches
What to Watch For Here
Limestone behaves unlike sand. Water moves through solution cavities and fissures rather than evenly through pore spaces, so two holes a short distance apart can give very different results, and a hole can intersect a good void or miss entirely.
Estuary proximity brings salinity into the analysis on the lower-lying and riverside properties.
What the Water Is Used For
- Garden and lawn irrigation on coastal stands
- Holiday and retirement property landscaping
- Smallholding irrigation on the flats
- Pool top-up, subject to salinity testing
- Guesthouse and hospitality grounds
- Standby water for planned and unplanned municipal shutdowns
Wellpoint or Borehole?
Commonly viable, and worth pricing before a borehole. The shallow coastal water table is what a point is designed for. It falls short where the sand is thin, where calcrete intervenes, or where you want water clean enough to bring indoors.
Registration and Abstraction
This area falls under Hessequa 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. The district also falls in the Breede-Gouritz water management area rather than the Cape Town one, which affects how abstraction is administered.
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 | R450 - R1,000 /m | Coastal sand and calcrete drill faster than the mountain rock inland, though calcrete bands slow things and complicate casing. |
| 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 | Distance from base and site access both move this; the site visit settles it. |
| 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. |
| Wellpoint alternative | R7,000 - R11,000 | Where sand depth and a shallow water table allow it, this covers garden irrigation for a fraction of the cost. |
| Typical complete project | R60,000 - R170,000+ | 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 - different 2026 guides quote per-metre drilling rates for the same province that differ by a factor of three - 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.
Stilbaai Borehole FAQs
Why do Stilbaai boreholes vary so much?
Because much of the ground is coastal limestone, where water moves through solution cavities and fissures rather than evenly through pore spaces.
A hole that intersects a good void produces well; one a short distance away that misses can disappoint. That unpredictability is inherent to the rock rather than a reflection on the drilling.
Is Stilbaai groundwater salty?
It can be on the lower-lying and estuary-side properties, where proximity to the Goukou and the sea makes raised chloride and sodium realistic.
Measure before designing irrigation, and stay within a tested sustainable rate rather than pumping hard, since over-abstraction near the coast worsens it.
Can I use a wellpoint in Stilbaai?
Where sandy cover has useful depth, sometimes. Where limestone sits close to surface, a driven point has nothing to penetrate and a drilled hole is the only option.
Establishing which applies to your stand is the first practical step and costs little.
Who do I register a Stilbaai borehole with?
Hessequa Municipality, not the City of Cape Town, so local registration and by-law conditions are theirs.
Abstraction is separately governed by the National Water Act, with the district falling in the Breede-Gouritz water management area.
DRILLING IN STILBAAI?
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