Borehole Water Testing: What to Test For and What It Costs

Sinking a borehole gives you access to groundwater that the municipality cannot interrupt. What it cannot guarantee is what is actually in that water. Johannesburg sits on a geologically varied Highveld, and borehole water quality varies enormously between stands — sometimes between neighbouring properties. Testing is not a bureaucratic formality; it is the only rational first step before you connect a pump to a tap or an irrigation line.

Why borehole water testing matters in Johannesburg

Groundwater picks up what it passes through. On the Witwatersrand that can mean naturally occurring iron, manganese, or fluoride, as well as legacy contamination from decades of mining, informal settlement runoff, or ageing municipal infrastructure. Johannesburg Water’s own figures show non-revenue water running at 44.8% — a reminder that the distribution network leaks, and those leaks can move contaminants in both directions depending on pressure conditions.

None of that is visible. Borehole water can look perfectly clear and still carry bacteria, nitrates, or dissolved heavy metals above the limits set in SANS 241 (2024 edition). Testing gives you a baseline — a document that tells you what you are actually dealing with.

If you are still weighing up whether a borehole is right for your property, the borehole drilling guide covers the full process from site assessment to commissioning.

What parameters should you test for?

Labs typically group tests into three categories:

Physical and aesthetic parameters — colour, turbidity (cloudiness), taste, odour, and total dissolved solids (TDS). These affect usability and can indicate deeper problems, but on their own they do not tell you whether water is safe.

Chemical parameters — pH, hardness, iron, manganese, nitrates, nitrites, fluoride, chloride, sulphate, and potentially heavy metals such as lead, arsenic, or chromium depending on your location. Mining-adjacent areas of Johannesburg warrant a broader heavy-metals screen. SANS 241 sets maximum limits for all of these.

Microbiological parameters — E. coli and total coliform counts are the minimum you should request. These are the indicators that tell you whether faecal contamination is present. The National Institute for Communicable Diseases (NICD) recognises waterborne illness as a significant public-health concern in South Africa; microbiology is the parameter you should never skip.

Test category	What it tells you	Minimum or optional?
Physical (TDS, turbidity, colour)	Aesthetic suitability, broad quality signal	Minimum
Chemical (pH, iron, nitrates, hardness)	Treatability, corrosion risk, health thresholds	Minimum
Heavy metals (lead, arsenic, chromium)	Contamination from geology or legacy industry	Optional — recommended near mining areas
Microbiological (E. coli, coliforms)	Faecal contamination, immediate health risk	Minimum
Extended organics / pesticides	Agricultural or industrial pollution	Optional — site-dependent

For drinking-water use, request a panel that covers all three minimum categories as a starting point. For irrigation of food gardens, microbiological testing is still important.

How to read a test report

Lab reports list results against the limits specified in SANS 241. A result marked as exceeding the aesthetic limit means water may taste or smell unpleasant but is not necessarily unsafe. A result exceeding the health limit requires action before the water is used for drinking or food preparation. The two categories are distinct, and confusing them leads either to unnecessary alarm or to genuine risk being overlooked.

Our guide on reading a water test report walks through the columns and flags on a standard South African lab certificate in plain language.

What borehole water testing costs in Johannesburg

Lab pricing varies by accreditation, turnaround time, and the number of parameters included. As a rough guide:

• A basic potability screen (physical, core chemical, E. coli and coliforms) typically costs somewhere in the low-to-mid hundreds of rand per sample.
• A comprehensive panel adding heavy metals, extended chemistry, and broader microbiology can run into a few thousand rand.
• Rapid turnaround or on-site testing tends to cost more than standard laboratory processing.

These are indicative ranges only — confirm current pricing directly with accredited labs before budgeting. Look for labs with SANAS (South African National Accreditation System) accreditation to ensure results are recognised and defensible. The South African Bureau of Standards (SABS) maintains SANS 241 and publishes the parameters labs test against.

It is worth budgeting for testing at three points: immediately after drilling and before pump installation; again after the system is commissioned and has been running; and periodically thereafter — annually is a common recommendation, though your installer or a hydrogeologist can advise based on your specific aquifer.

Getting a borehole installed and want to know your total costs upfront? Compare 3 free quotes — vetted installers, no obligation.

Test first, treat second — always

A common and costly mistake is purchasing a filtration system before testing. A salesperson may recommend a reverse-osmosis unit, a UV steriliser, or an iron filter — but without a test report, there is no way to know whether that equipment addresses your actual water quality or whether it is even necessary.

Some Johannesburg boreholes yield water that needs little more than basic sediment filtration. Others require multi-stage treatment before any drinking use is appropriate. You will not know which category your water falls into until you have a lab report in hand.

Our article on whether borehole water is safe to drink covers the treatment options relevant to different contaminant profiles and explains why professional assessment of your specific report matters.

Choosing an accredited laboratory

When selecting a lab, check that it holds SANAS accreditation for the parameters you need tested — this ensures the methodology and chain of custody meet national standards. Your borehole driller or a local hydrogeologist can often recommend labs familiar with Highveld groundwater profiles. Turnaround times vary; if you need results quickly for a property transaction or an urgent commissioning decision, confirm lead times before submitting samples.

Sample collection also matters. Contamination during sampling will produce a false result. Follow the lab’s exact instructions on container type, flushing the line before sampling, and transport conditions — most accredited labs provide a collection kit and written protocol.

Once your test results are in and you know what system you need, it pays to get competing installation prices. Get free borehole quotes from installers who know Johannesburg's groundwater conditions.

How testing fits into your overall borehole budget

Typical complete borehole systems in Johannesburg run R40,000–R150,000, with most falling between R60,000 and R100,000 — and that range does not always include filtration, which is scoped separately once water quality is known. Borehole pumps typically cost R15,000–R35,000 installed. Testing costs are modest by comparison and front-load information that shapes every subsequent decision, from pump specification to treatment train to whether a system is suitable for potable use at all. Treating testing as an optional add-on rather than a foundation step tends to produce more expensive outcomes, not fewer.