Load-Shedding Water Readiness Checklist

Load-shedding cuts the electricity that drives municipal pumping stations — and Johannesburg Water’s infrastructure is no exception. When pump stations go offline or run on degraded capacity, pressure in reticulation pipes drops, sometimes to zero. If your home also relies on an electric pressure pump to move water from a header tank or storage vessel, you lose water twice: once when the municipality struggles, and again when your own pump stops. This checklist works through the problem in the order it actually needs to be solved.

Why Johannesburg Homes Are Particularly Exposed

Johannesburg sits on the Highveld — an inland plateau — which means the city cannot rely on gravity alone the way coastal cities can. Water has to be pumped uphill repeatedly across the distribution network. Johannesburg Water’s own figures put non-revenue water (losses through leaks and system inefficiencies) at 44.8% for the 2024/25 audited period, which means the network is already under stress before load-shedding adds to it. The city’s reservoir system provides roughly 27 hours of citywide storage buffer under normal demand. That sounds adequate until you consider that demand spikes, multiple stages of load-shedding overlap, and your own household has no storage of its own.

Understanding the wider backup water systems landscape helps you see where your household fits — and where the gaps are.

Step 1 — Calculate How Much Storage You Actually Need

South Africans use on average about 237 litres of water per person per day, above the world average of roughly 173 litres, according to IWA Water Policy data. A household of four therefore uses around 950 litres daily under normal conditions. In a genuine emergency you can cut that significantly — cooking, drinking and basic sanitation might bring you down to 50–80 litres per person per day as a rough guide.

As a starting point:

• Stage 4–6 load-shedding can mean 4–6 hour outages at a time, sometimes twice daily.
• Aim for at least one full day’s reduced-demand storage — so roughly 200–320 litres for four people at emergency rates.
• For genuine resilience, 1,000–2,500 litres of stored water is a more practical target for most Johannesburg households, though you should confirm your specific needs when getting quotes.

Slim vertical tanks (500–2,500 litres) can fit in a garage or alongside a boundary wall. Larger JoJo-style tanks (5,000–10,000 litres) work in gardens but need a concrete or paving base — confirm the structural requirements with your installer.

Step 2 — Feed That Storage Automatically from the Municipal Supply

A storage tank that you fill manually by hose is a tank that will be empty when you need it most. A basic ball-valve inlet means the tank tops up whenever municipal pressure is present. More reliable is a small float-valve assembly fitted to the inlet — the kind used in most header tank installations.

If you are connecting a large tank to the household supply line, your installer will likely add a pressure-reducing valve (PRV) on the inlet side, because Johannesburg municipal pressure can exceed what domestic fittings handle comfortably. This is standard practice, not an optional extra — confirm it is included in any quote you receive.

Step 3 — Gravity Feed Where You Can, Pump Only Where You Must

A tank on the ground cannot supply a first-floor bathroom tap without a pump. A tank elevated 3–5 metres above the outlet it is serving can deliver low-pressure gravity flow — typically enough to flush a toilet or fill a basin, though not enough for a shower with a flow-restricting head. Gravity feed requires no electricity and fails in almost no scenario. It is the most resilient option available.

Where gravity feed is not practical — which is most Johannesburg homes — you need a pressure pump, and that pump needs power during load-shedding. Your realistic options are:

• A small UPS (uninterruptible power supply) sized to your pump’s draw. Typically adequate for modest booster pumps during short outages.
• A dedicated lithium battery inverter, which can run a pump through multiple load-shedding slots without recharging from the grid in between.
• Connection to an existing solar-and-battery installation, if you already have one — confirm with your solar installer that the system can carry the pump’s start-up surge current.

The post on water storage and load-shedding covers the battery-sizing side of this in more detail and is worth reading before you commit to a specific pump and power pairing.

If you're not sure which tank-and-pump combination suits your property, get a few professional eyes on it before spending anything. Compare 3 free quotes — vetted installers, no obligation.

Step 4 — Know Your Pump Options and Rough Costs

Backup tank-and-pump systems typically cost R20,000–R40,000 for a basic setup, with whole-house configurations running around R55,000. Borehole pumps, if you are going further down the independence route, typically cost R15,000–R35,000 installed; complete borehole systems in Johannesburg run R40,000–R150,000, with most falling between R60,000 and R100,000. These are verified typical ranges — your actual quote will depend on tank size, pump type, depth (for boreholes), and site conditions.

Solution	Rough cost range	Power dependency during load-shedding
Gravity-fed tank (elevated)	Confirm via quotes	None
Tank + booster pump + UPS	Confirm via quotes	Low (UPS)
Tank + pump + battery inverter	R20,000–R55,000 as a guide	Low–moderate
Full borehole system	R40,000–R150,000	Depends on pump backup

Always get at minimum three written quotes and confirm exactly what is included — installation, plumbing connections, electrical work and any compliance certificates.

Step 5 — Address Drinking Water Quality Separately

Stored water that sits in a tank can develop bacterial growth, particularly in warm Johannesburg summers. It also picks up whatever was in your pipes when pressure dropped — low pressure can allow backflow and contamination. SANS 241 (2024 edition) is the South African drinking-water quality standard; municipal supply is tested against it, but water that has sat in a private tank is not.

Practical steps:

• Keep tanks covered and UV-resistant (most proprietary tanks are, but check).
• If you are storing for more than 48–72 hours, treat with food-grade sodium hypochlorite at concentrations appropriate for storage — your installer or a water-treatment supplier can advise on dosing for your tank size.
• For drinking and cooking, a countertop or under-sink filter rated for bacteria and turbidity adds a useful final barrier. Point-of-use filters are relatively low cost and do not require any plumbing modification.
• Never drink stored water without treatment unless you have verified it meets SANS 241 through testing.

Putting together a complete tank, pump and power solution is easier with professional input from the start — costs and options vary significantly by property. Get free quotes from local installers and compare on equal terms.

The Checklist at a Glance

Work through these in order. Tick each off only when it is physically in place, not just planned.

1. Calculated daily water requirement for your household at both normal and emergency rates.
2. Storage tank installed with capacity to cover at least one full day at emergency rates — ideally more.
3. Auto-fill inlet fitted with float valve and PRV so the tank tops up without manual intervention.
4. Gravity feed assessed — if achievable, prioritise it for at least toilet flushing.
5. Pump power source confirmed — UPS, battery inverter or solar system checked for surge capacity.
6. Plumbing and electrical compliance — COC (Certificate of Compliance) obtained where required.
7. Water treatment protocol in place — dosing for stored water, point-of-use filtration for drinking.
8. Tank inspected and cleaned — at least annually, more often in summer.

None of these steps is complicated in isolation. The difficulty is usually in sequencing them correctly and selecting components that work together. A qualified installer who deals specifically with water backup systems — not just a general plumber — will save you money and rework in the long run.