Borehole water against municipal water: the honest comparison
A borehole does not remove a water cost - it trades a metered bill for electricity, upkeep and an upfront spend. Here is the honest picture.
What you stop paying for, and what you start paying
Municipal water is metered, and in a large garden much of that bill is irrigation. Borehole water replaces a good deal of that metered supply, which is the headline saving. But a borehole is not free water: it moves the cost from a rate per kilolitre to electricity for the pump, plus maintenance, plus the upfront capital of drilling, the pump, the storage and the plumbing.
So the honest framing is a trade, not a saving that appears by itself. Whether it pays off depends on how much municipal water you would otherwise buy, what that water costs you, and how much electricity your pump actually draws.
The variables that decide the payoff
Three things dominate the calculation. First, your municipal usage: a big garden, a pool and a large household in Johannesburg buy a lot of water, and the more you buy, the more a borehole can displace. Second, the borehole itself: a good-yield hole at a modest depth needs less electricity to run than a deep hole with a hard lift. Third, the duty cycle: a pump that runs a couple of hours a day into storage uses far less power than one fighting demand all day.
- How much municipal water you actually buy now.
- The yield and depth of the hole, which set the pumping energy.
- How the pump is run - steady into storage, or chasing demand.
- Storage, which lets you run the pump at its efficient rate.
The costs that are easy to forget
Upfront capital is the obvious one, but not the only one. Pumps wear out and need replacing; controls need attention; tanks need cleaning; and a hole may slowly silt or its level may drop in a dry spell, reducing what it gives. Setting money aside for maintenance is part of a fair comparison, because a borehole is a system with moving parts, not a tap.
There is also a reliability dividend that does not show in a simple cost sum. A well-built borehole with storage keeps a garden and often a house going through a municipal interruption or restriction. If that resilience is worth something to you - and for many Johannesburg owners it is the main reason they drill - it belongs in the comparison alongside the rand figures.
Doing the sum for your own property
There is no single break-even that applies to everyone, because it depends on your usage, your hole and your habits. The practical approach is to gather your own numbers: what you spend on municipal water over a year, what your garden alone roughly uses, and what a contractor expects a borehole on your stand to require. Then compare the running cost of the pump against the water it displaces.
A useful first step costs nothing: read a few municipal bills and work out how much of the total is water rather than rates and electricity, and how much of that water the garden accounts for. That single figure tells you the ceiling on what a borehole could save you, before any contractor is involved.
Treat any figure you are quoted for savings as an estimate, not a promise. We do not publish savings figures, because they depend on facts that only exist once a hole is drilled and metered against your own use.
Frequently asked questions
Will a borehole pay for itself?
It depends on how much municipal water you displace and what the pumping costs you. There is no single break-even - it has to be worked out for your property and usage.
Is borehole water cheaper than municipal water?
It can be, once the pump's electricity and the upkeep are counted against the water you stop buying. The honest answer follows your own numbers, not a rule of thumb.