Borehole for Irrigation Only: A Simpler, Cheaper Setup

If you want a borehole purely to keep a garden alive during water restrictions or to cut your municipal bill on irrigation, you almost certainly do not need the full system built for drinking water. An irrigation-only setup is a legitimate, well-established option — and understanding exactly what it includes, and what it sensibly leaves out, helps you spend only what you actually need to spend.

What an irrigation-only borehole actually involves

The core components are the same as any borehole: site assessment and geophysical survey, drilling, steel or uPVC casing, a submersible pump, rising main, wellhead protection, and a basic control box. What changes is everything downstream of the wellhead.

For irrigation you typically need:

• A sediment pre-filter to protect the pump and dripper lines from fine sand and silt
• A pressure-rated storage tank or header tank (optional but useful for balancing demand from multiple irrigation zones)
• Basic pipework to your irrigation controller or directly to soaker lines and sprinkler heads
• A non-return valve to prevent backflow into the borehole

What you do not need for irrigation only:

• UV sterilisation or chemical dosing
• Compliance testing against SANS 241 drinking-water standards
• Pressure-reducing valves sized for household fixtures
• Integration with your internal plumbing or geyser feed
• A separate municipal top-up connection with backflow prevention at the boundary

That shorter list of components is where the cost saving comes from.

What it typically costs compared with a full system

For context on the full spectrum, complete borehole systems in Johannesburg typically run R40,000–R150,000, with most falling between R60,000 and R100,000. Those figures assume a whole-house setup with treatment and plumbing integration.

An irrigation-only system trims the upper end significantly. As a rough guide:

Component	Typical irrigation-only range
Drilling and casing (to aquifer depth, varies widely)	Confirm via quotes
Submersible pump, installed	R15,000–R35,000
Sediment filter and wellhead protection	Typically R2,000–R6,000
Basic pipework to irrigation controller	Typically R3,000–R8,000
Rough total	R40,000–R80,000 for most Joburg sites

Those ranges are estimates. Drilling depth drives cost more than anything else, and depth varies by suburb and geology. Always confirm totals via actual quotes before budgeting.

For comparison, backup tank-and-pump systems (municipal water stored in a tank for household use) typically cost R20,000–R40,000, with whole-house configurations around R55,000. An irrigation borehole is a different product — it produces its own water rather than just buffering municipal supply — but the price overlap is worth knowing when you are weighing your options.

What yield you actually need for irrigation

Yield is where irrigation-only setups are forgiving. A dripper or sprinkler system does not demand the constant, high-pressure flow that household plumbing does. A modest borehole yielding 1,000–2,500 litres per hour is often workable for a suburban Johannesburg garden, depending on its size and the irrigation schedule you run.

That said, you still need a proper yield test done before installation. A borehole drilled into a low-yield aquifer will not reliably supply even an irrigation system during a dry winter. Reputable drillers will conduct a pump test (typically 4–8 hours minimum) and give you a sustainable yield figure in writing. Do not accept a system without one.

It is also worth noting that South Africans use on average about 237 litres of water per person per day — well above the world average of roughly 173 litres — and outdoor irrigation accounts for a meaningful share of residential use. Replacing that municipal draw with borehole water is precisely the use case this setup is designed for.

An irrigation borehole quote depends heavily on your suburb's geology — and prices vary more than most people expect. Compare 3 free quotes — vetted installers, no obligation.

Water quality: what you still need to check

Because you are not drinking the water, you do not need to meet SANS 241 drinking-water standards. But water quality still matters for irrigation, for two reasons.

First, high iron or manganese content will stain paving, walls, and outdoor surfaces, and can clog dripper emitters over time. A basic water-quality test (iron, pH, electrical conductivity, and hardness as a minimum) is inexpensive and tells you whether you need an iron-removal filter before the irrigation lines.

Second, salinity and sodium adsorption ratio (SAR) affect soil structure over years of irrigation. Water with high SAR can degrade clay soils and reduce long-term drainage. This matters more for vegetable gardens and lawns than for established trees.

The Department of Water and Sanitation sets guidelines for irrigation water quality that are distinct from the SANS 241 drinking standard — your driller or a water-quality laboratory can test against those parameters specifically. It is a one-off cost that protects your garden and your infrastructure.

What this setup cannot do

Be clear-eyed about the limitations before you commit.

It does not help during load-shedding unless you add a generator or solar-powered pump controller. Your irrigation pump runs on electricity just like a whole-house system.

It does not give you potable backup water. If Johannesburg’s roughly 27-hour reservoir storage buffer runs low during a supply interruption, your irrigation borehole will not fill a kettle or flush a toilet safely without additional treatment.

It does not guarantee water rights compliance automatically. South Africa’s National Water Act requires registration of boreholes used for water abstraction above certain thresholds. Confirm registration requirements with the Department of Water and Sanitation for your specific use and volume — your driller should assist with this as part of the installation.

If you are still deciding whether irrigation-only or a full system makes more sense for your property, getting a few site-specific quotes is the fastest way to make that call. Get borehole quotes now — no obligation, no sales pressure.

Whether it is the right choice for you

An irrigation-only borehole is the right choice if your main goal is reducing municipal water consumption for outdoor use, and you are not planning to plumb borehole water into your home now or in the near future.

It is probably the wrong choice if you expect to upgrade to whole-house use within a few years — in that case, the cost saving of going irrigation-only today may be offset by the cost of retrofitting treatment and plumbing later. A conversation with a driller about future-proofing the wellhead and pump sizing is worth having at the start, not after installation.

For straightforward irrigation purposes on a suburban Johannesburg plot, though, the stripped-back setup does exactly what it needs to — cleanly, reliably, and without paying for equipment you will never use.