Is Borehole Water Free? The Real Cost of "Free" Water

The phrase “free water” gets used a lot by borehole enthusiasts, and it is understandable — once the capital is spent and the system is running, there is no monthly municipal water line on your bill. But free and zero-cost are not the same thing. Running a borehole costs money every month; it just costs differently from buying municipal supply. Here is an honest breakdown of what you actually pay.

Where the “free” idea comes from

The logic is straightforward: groundwater belongs to no one company, the aquifer does not send invoices, and once the borehole is drilled you are not buying a commodity volume at a tariff. For homeowners in Johannesburg who are watching municipal water bills climb — and who are aware that Johannesburg Water’s own figures show non-revenue water running at 44.8% (2024/25 audited figures), suggesting a system under serious strain — the appeal of cutting that dependency is obvious.

But the aquifer is only one input into the system. The water still has to be lifted from underground, stored, and in many cases treated. Each of those steps has a cost.

The capital cost you have already committed (or are considering)

If you have not yet drilled, this is your starting point. Complete borehole systems in Johannesburg typically run R40,000–R150,000, with most residential installations falling between R60,000 and R100,000. Borehole pumps alone — the component that does the actual lifting — typically cost R15,000–R35,000 installed. These figures cover drilling, casing, the pump, a basic control box, and connection to your storage tank.

Capital cost is not a running cost, but it matters for the true per-kilolitre calculation. If you spend R80,000 and the system lasts 15 years, that is roughly R5,300 per year in capital amortisation before you have run the pump once. The longer the equipment lasts and the more water you pump, the lower that per-litre capital component becomes — which is why high-use properties (irrigation, a pool top-up, a large household) tend to see better payback.

Electricity: the real monthly bill

This is the cost most people underestimate. A submersible borehole pump draws continuous current while it runs, and the deeper the pump sits, the harder it works. As a rough guide, a mid-range 0.75 kW pump running two hours a day will consume around 45 kWh per month — confirm your specific pump’s nameplate rating and your daily run time to get an accurate figure. At Eskom and City of Johannesburg tariff levels, that alone can add up to a meaningful monthly amount; get quotes from installers and ask them to model your expected run-time against your household’s daily demand.

South Africans use on average about 237 litres of water per person per day (IWA Water Policy figures), above the world average of roughly 173 litres. A household of four therefore uses somewhere around 950 litres per day — under a kilolitre — just for personal consumption, before garden irrigation. Factor that volume into your pump run-time calculations.

Servicing, maintenance, and consumables

A borehole is not a fit-and-forget installation. Typical ongoing costs include:

Item	Typical frequency	Rough cost guide
Annual pump service	Yearly	Confirm with your installer
Water quality testing (SANS 241 compliance)	6–12 monthly	Varies by lab and parameters tested
Filter cartridge replacement	3–6 monthly	Depends on filtration setup
Pump replacement (end of life)	Every 7–15 years	R15,000–R35,000 installed
Pressure tank / control gear	Every 10–15 years	Confirm via quotes

SANS 241 (2024 edition) is the South African drinking-water quality standard. If you intend to drink borehole water rather than use it only for irrigation and toilet flushing, testing against SANS 241 parameters is not optional — it is how you find out whether your water is actually safe. Treatment equipment (UV sterilisers, sediment filters, carbon filters) adds both capital cost and an ongoing consumables bill.

For households that have not yet committed to a full borehole and are weighing a backup tank-and-pump system first, those typically cost R20,000–R40,000, with whole-house configurations around R55,000 — a useful comparison point. You can read more about borehole running costs broken down by category to see how these line items stack up over time.

Trying to work out whether the numbers actually stack up for your property? Compare 3 free quotes — vetted installers, no obligation.

What is the real per-kilolitre cost?

When you add electricity, amortised capital, and servicing, the honest range for most Johannesburg residential boreholes lands somewhere between R5 and R20 per kilolitre, depending on:

• Depth to water — deeper means more pumping energy per litre
• Pump efficiency — an older or undersized pump works harder than a properly specified one
• Volume pumped — the capital and fixed service costs spread across more litres if you use the borehole heavily
• Treatment requirements — iron-rich or brackish water needs more equipment and consumables

Compare that to your current municipal tariff (check your latest bill for the stepped rate that applies to your usage band) and you can make an informed decision. The article Is a borehole worth it in Johannesburg? works through the payback logic in more detail if you want to model your own household.

The costs that are harder to quantify

Beyond rand amounts, owning a borehole means owning the responsibility. When the pump fails on a Saturday afternoon, the call-out cost and the waiting time are yours to manage. Municipal supply, for all its unreliability — Johannesburg’s reservoir system holds roughly 27 hours of citywide storage buffer, which leaves limited room for supply disruptions — does come with a utility that answers for outages. A borehole transfers that accountability entirely to you.

You also take on water quality responsibility. Municipal supply is treated to SANS 241 standards before it reaches your tap. Borehole water is whatever the aquifer delivers, and aquifer chemistry can shift seasonally or after nearby construction or land-use changes. Regular testing is not paranoia; it is basic stewardship.

If you are ready to get real figures for your specific stand and depth, request quotes from three vetted drillers — it costs nothing and gives you actual numbers to compare.

So is borehole water worth it?

For many Johannesburg homeowners, yes — but the case rests on reduced municipal dependency and long-term savings, not on the water being free. The operating costs are real, they recur every month, and they need to be modelled honestly before you commit. A properly specified, well-maintained borehole on a productive aquifer can deliver water at a per-kilolitre cost well below municipal tariffs for high-volume users. A poorly specified one on a marginal aquifer, left unserviced, may cost more per litre than just staying on the grid.

Do the numbers, get the quotes, test the water. That is how you find out whether “free” actually pencils out for your property.