Commercial Borehole Feasibility: The Study Before the Spend

Drilling a commercial borehole without a feasibility study is a bit like building a warehouse without a soil investigation — you might get away with it, or you might spend a six-figure sum on a dry hole. A feasibility study is the structured process that tells you, before any drill bit touches the ground, whether your site has workable groundwater, how much you can realistically extract, and what hoops the law requires you to jump through.

This guide explains what a study covers, what it costs, and how to use it to make a sound decision.

Why Feasibility Matters More for Commercial Sites

Residential boreholes carry risk too, but a homeowner who hits a low-yield hole has lost perhaps R60,000–R100,000. A business that drills for process water, irrigation, or staff ablutions on a large site faces higher stakes: bigger systems, stricter licensing thresholds, and the operational consequence of a borehole that cannot meet daily demand.

Johannesburg Water’s own audited figures show non-revenue water running at 44.8% for 2024/25 — a reminder that municipal supply is already under strain. Businesses that depend on uninterrupted water need to understand groundwater as a serious infrastructure decision, not a quick fix.

For a broader view of water-supply options beyond boreholes, the commercial water solutions overview sets out the landscape of technologies and approaches available to Johannesburg businesses.

What a Feasibility Study Actually Covers

A credible study has four working parts:

1. Hydrogeological desktop review A hydrogeologist reviews existing regional geological maps, borehole registers (held by the Department of Water and Sanitation), and any aerial or satellite data relevant to your site. This tells you what rock formations are likely beneath your property and whether the area has a history of productive boreholes.

2. Site investigation and geophysical survey The consultant visits the site and typically runs a geophysical survey — often electrical resistivity or electromagnetic methods — to identify fracture zones where groundwater is most likely to collect. This is the part that genuinely changes the odds of a successful drill: targeting a fracture zone rather than solid rock can be the difference between a productive borehole and an expensive lesson.

3. Demand modelling A feasibility study worth commissioning will compare the site’s estimated daily water demand against the projected yield range for the aquifer. If your operation needs 50,000 litres a day and the geology suggests a yield of 5,000 litres a day at best, the numbers do not work — and you need to know that before you drill. The consultant should also consider seasonal variation and the effect of pumping on neighbouring users.

4. Regulatory and licensing assessment This is where many business owners are surprised. Under the National Water Act, large commercial abstractions require a water use licence from the Department of Water and Sanitation. The feasibility study should map out which licensing category applies to your expected abstraction volume, what the application process involves, and roughly how long it takes. Skipping this step and drilling without the correct authorisation creates legal exposure that no water saving justifies.

Typical Costs and Timelines

Feasibility study costs vary considerably depending on site size, geological complexity, and how much geophysical work is needed. As a rough guide, desktop reviews and basic site visits for smaller commercial properties might run in the range of R8,000–R25,000, while full studies including geophysical surveys and detailed demand modelling on larger sites can reach R50,000 or more. Treat those figures as orientation only — get formal quotes from registered hydrogeologists before budgeting.

Timeline is typically two to six weeks for the study itself, though licensing applications can add months to a project schedule. Factor that into your planning if water supply is time-sensitive.

For context, typical complete borehole systems in Johannesburg run R40,000–R150,000, with most commercial installations falling between R60,000 and R100,000 for the borehole itself, plus R15,000–R35,000 installed for the pump. A feasibility study that costs a fraction of those figures and prevents a bad drill is straightforward value.

If you're weighing up whether a borehole makes commercial sense for your site, comparing installer quotes is a useful parallel step. Get 3 free borehole quotes — vetted installers, no obligation.

The Licensing Question: Do Not Skip This

The National Water Act and the regulations administered by the Department of Water and Sanitation set out what constitutes a registerable or licensable water use. For many commercial abstractions, registration alone is required at lower volumes; larger abstractions need a full water use licence. Neither is optional.

The Groundwater Division (a professional body for hydrogeologists in South Africa) maintains guidance on responsible groundwater use and can help identify registered practitioners. Using a registered professional hydrogeologist for your study is not just good practice — some municipal and provincial processes expect it.

The article on boreholes for business goes into more detail on what commercial operators need to know about compliance and operational management once a borehole is in service.

Reading the Study Output: Key Questions to Ask

When you receive a feasibility report, focus on these points before deciding to proceed:

Question	What a good report should tell you
What is the estimated sustainable yield?	A realistic range, not a best-case figure
What is the recommended drilling depth and target zone?	Specific, based on the geophysical data
What water quality is expected?	Reference to SANS 241 (2024) for potable use
What licensing is required?	Category, application process, estimated timeframe
What are the risks if the borehole underperforms?	Honest assessment, not just a positive scenario

A report that answers all five clearly is one you can make a decision from. A report that hedges on all of them without explanation warrants a follow-up conversation with the consultant.

Comparing Quotes for the Study Itself

Just as you would compare quotes for the drill and pump installation, compare quotes for the feasibility study. Scope varies: some consultants include geophysical survey in their fee, others quote it separately. Make sure you are comparing equivalent scopes.

The guide on how to compare water quotes covers the mechanics of reading and comparing contractor proposals — the principles apply equally to feasibility studies as to installation quotes.

Ready to move from study to installation quotes? Compare 3 free quotes from vetted installers — no obligation, no pressure.

Making the Go or No-Go Call

A feasibility study does not guarantee a successful borehole — geology involves uncertainty and any honest consultant will say so. What it does is give you structured, professional information on which to base a decision, rather than relying on a neighbour’s anecdote or a contractor’s optimism.

If the study says the aquifer is marginal and licensing is uncertain, that is a valuable result even though it is not the one you wanted. It has saved you the cost of a full installation on a site that would never deliver. If it says conditions are favourable and yield projections match your demand, you can proceed with reasonable confidence and a defensible paper trail.

For most Johannesburg businesses, the feasibility study is not an optional extra. It is the first line item in a responsible borehole budget.