Borehole Water: Pros, Cons and Plumbing Considerations for Midrand & Johannesburg Homes

With municipal water interruptions a regular feature of life across Midrand, Johannesburg and Pretoria, more homeowners are looking at boreholes as a genuine backup — or even primary — water source. It’s a bigger decision than installing a JoJo tank, so here’s what actually needs to be thought through before drilling.

What a Borehole Actually Involves

A borehole is a drilled well that reaches the water table below your property, with a submersible pump bringing water up to the surface. Unlike a JoJo tank (which stores municipal or rainwater you already have), a borehole gives you an independent water source — but only if there’s usable groundwater beneath your specific property, which isn’t guaranteed everywhere across Gauteng.

The Real Pros

• Independence from municipal supply — genuinely useful during extended outages or infrastructure failures rather than just short interruptions.
• Lower long-term water costs — once the system is installed, ongoing costs are largely electricity for pumping rather than a metered municipal bill.
• Consistent supply for irrigation — many households use borehole water for gardens and pools specifically to reduce municipal usage, even while keeping municipal water for drinking.

The Real Cons

• Water yield and quality vary by location — some properties hit good, clean water quickly; others get low yield, or water with high mineral content or turbidity that needs treatment before it’s usable indoors. There’s no way to know for certain without drilling — a hydrogeological assessment can improve the odds but can’t guarantee results.
• Upfront cost is significant — drilling, casing, the pump, electrical work, and typically a filtration/treatment system all add up. It’s a considerably bigger investment than a JoJo tank and pump setup.
• Load shedding still affects you — a borehole pump needs electricity, so without a backup power source (inverter, generator, or solar), a borehole doesn’t help during a power outage even though it isn’t dependent on municipal water.
• Registration requirements — boreholes for anything beyond minor domestic use generally need to be registered with the Department of Water and Sanitation. This isn’t optional paperwork to skip; unregistered use can create compliance problems later, particularly if you ever sell the property.

Plumbing Considerations That Actually Matter

Backflow Prevention Is Non-Negotiable

If a borehole system is plumbed into a house that’s also connected to municipal supply, proper backflow prevention is essential — without it, there’s a real risk of borehole water contaminating the municipal line, which is both a health hazard and increasingly a compliance requirement local authorities are enforcing more strictly.

Filtration and Water Testing

Borehole water should be tested before it’s used for anything beyond irrigation — mineral content, bacterial contamination, and turbidity all vary significantly by area and even by depth on the same property. Depending on results, this can mean anything from a simple sediment filter to a full treatment system before the water is safe for household use.

Pressure and Storage

Most borehole setups pump into a storage tank first (rather than feeding taps directly), with a pressure pump then supplying the house at normal mains pressure. Sizing this correctly — tank capacity, pump specification — is where a lot of DIY or budget installations go wrong, leaving homeowners with inconsistent pressure or a system that can’t keep up with actual household demand.

Integration With Existing Plumbing

Whether a borehole feeds the whole house, just outdoor taps and irrigation, or acts purely as backup during outages changes the plumbing layout significantly. This needs to be decided before installation, not retrofitted awkwardly afterward.

Is It Worth It?

For a property with reliable yield and manageable water quality, a well-installed borehole is a genuine long-term investment that reduces both water bills and outage vulnerability. For a property with poor yield or heavily mineralised water, the cost-benefit case is much weaker — which is exactly why a proper site assessment before committing matters more than the drilling itself.