Resilience & the JHB water crisis
Water Questions to Ask Before Buying a Home in Johannesburg
By the WaterQuotes team · Published 2026-09-03 · 5 min read
Buying a home in Johannesburg involves the usual checks — structure, electrics, title deed. Water rarely makes the shortlist, yet it probably should sit near the top. With Johannesburg Water reporting non-revenue water of 44.8% in its 2024/25 audited figures, and the city’s reservoir system holding roughly 27 hours of citywide storage buffer, supply reliability varies meaningfully from one suburb to the next. A house that looks perfect on a Saturday viewing may be one pressure zone away from regular outages that the seller has quietly learned to live around.
The questions below are not exhaustive, but they cover the issues that tend to surface — expensively — after transfer.
What is the supply history for this specific address?
Municipal supply reliability in Johannesburg is not uniform. Pressure zones, ageing infrastructure and network losses mean one street can experience daily low-pressure windows while a street nearby barely notices. Ask the seller directly: have there been outages in the past 12 months, and how often? Request copies of any communication from Johannesburg Water about planned maintenance or pressure reductions. If the seller cannot produce anything, search the address on the Johannesburg Water outage portal before you proceed.
A blanket “supply has been fine” answer is not enough. Ask for specifics.
Does the property have any backup water infrastructure?
This is arguably the most practically important question. Backup systems range from a basic JoJo tank plumbed to a header tank, through to a fully pressurised system with pump, automated switchover and meaningful storage capacity. Backup tank-and-pump systems typically cost R20,000–R40,000 for a standard installation, with whole-house setups running around R55,000 — costs the seller has either absorbed or not.
If infrastructure exists, find out:
- How large is the storage tank (in litres, not vague descriptions like “big”)?
- Is the pump on a timer, float switch or manual?
- When was the pump last serviced, and by whom?
- Is the system gravity-fed or pressurised?
- Does backup water reach all taps and the geyser, or only select outlets?
A tank that fills slowly during off-peak hours but cannot maintain pressure during the morning routine is a system in name only. Get the specifics in writing.
Is there a borehole, and what condition is it in?
Some Joburg properties — particularly in older suburbs and on larger stands — have boreholes, and this can meaningfully affect day-to-day resilience and long-term running costs. For more on how borehole infrastructure affects larger properties specifically, see our guide to boreholes on large properties.
If a borehole is present, ask:
- When was it last tested for yield (litres per hour)?
- Has the water been tested against SANS 241 (the 2024 South African drinking-water quality standard)?
- Is the pump in working order, and what is its age?
- Is the borehole registered with the relevant authorities?
- Is it used for drinking water, irrigation only, or both?
Borehole pumps typically cost R15,000–R35,000 installed, and a complete borehole system — drilling, casing, pump and reticulation — runs R40,000–R150,000 for most Joburg residential installations, with the majority falling between R60,000 and R100,000. An ageing or underperforming borehole is not a free asset; it is a maintenance liability that you are inheriting.
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What is the water quality, and has it been tested recently?
Municipal supply quality in Johannesburg is governed by SANS 241 (2024 edition), and Johannesburg Water is obliged to supply water that meets this standard. In practice, water quality at the tap can differ from water quality at the treatment works, particularly in areas with old lead solder joints or corroded internal plumbing.
If the property uses borehole water for any potable purpose, SANS 241 compliance should not be assumed — it should be confirmed with a recent laboratory test. Ask to see results. If none exist, factor in the cost of testing and potential treatment (filtration, UV, softening) before you decide how to value the infrastructure.
Even on municipal supply, if the property is in an older suburb, ask whether the internal plumbing has been updated and whether any lead components remain.
What does the water account history look like?
A Johannesburg Water municipal account tells you several things a seller might not volunteer. Request at least 12 months of statements:
- Consumption figures: South Africans use on average about 237 litres per person per day. A house where the stated household was consuming significantly more or less than plausible for their stated occupancy may have a leak — or the account may be shared with a neighbouring property in ways that aren’t immediately obvious.
- Account arrears: Unpaid municipal accounts can attach to a property. Verify with the municipality that the account is clear before transfer.
- Tariff category: Confirm the property is billed correctly for its zoning and usage type.
For context on how water infrastructure affects a property’s broader value, the WaterQuotes blog covers the relationship between resilience investments and Joburg property markets in more detail, and the article on water and property value in Johannesburg is particularly relevant if you are weighing up what backup infrastructure is worth paying for.
If the property you're buying has no backup infrastructure, the cost to install can be assessed before you sign. Get free quotes from vetted installers and know exactly what you're committing to.
What should go into your due diligence checklist?
To summarise in practical terms, before signing an offer to purchase on a Joburg property, work through this:
| Question | What to ask for |
|---|---|
| Supply reliability | 12-month outage history; Johannesburg Water zone map |
| Backup system | Tank size, pump model, last service date, coverage |
| Borehole (if present) | Yield test, SANS 241 water test, pump age, registration |
| Water quality | Lab test results (especially for borehole or old plumbing) |
| Municipal account | 12 months of statements; confirmation of zero arrears |
| Internal plumbing | Age of pipes; any known lead solder or galvanised steel |
None of these questions is unreasonable to ask. A seller who cannot or will not provide clear answers to them is, in effect, telling you something useful. Water security in Johannesburg is not a minor amenity concern — it is infrastructure that affects how liveable a property actually is, day to day, and what it will cost you to bring it to a reliable standard if the current owner has not invested in it.
Quick answers
Is a seller in Johannesburg legally required to disclose water supply problems?
South African property law requires sellers to disclose known latent defects, and a persistent supply problem or a failing pump could qualify. However, the disclosure regime is imperfect and enforcement after transfer is difficult. It is safer to ask specific, documented questions before signing than to rely on the voetstoots clause working in your favour later.
How do I check whether a Johannesburg property's municipal account is in arrears?
You or your conveyancing attorney can request a rates clearance certificate from the City of Johannesburg, which confirms that all municipal accounts — including water — are clear. This is standard in the conveyancing process, but it is worth asking your attorney to confirm the position explicitly before transfer rather than assuming it will be caught automatically.
Should I get a borehole tested before buying a property that has one?
Yes, in most cases. A borehole that has not been tested recently may have declining yield, water quality that does not meet SANS 241, or a pump nearing end of life. The cost of a yield test and a basic water quality test is modest relative to the cost of inheriting a borehole that needs significant remediation.
What is a reasonable amount of backup water storage for a Johannesburg home?
As a rough guide, a household of four people using around 237 litres per person per day needs roughly 950 litres per day for normal use — so a 2,500-litre tank provides just over two days of full usage. Many advisors suggest aiming for at least two to three days of storage, but the right size depends on your household's actual consumption and how quickly the tank can refill from either municipal supply or a borehole. Get specific advice based on the system in question.
Does having backup water infrastructure add value to a Johannesburg property?
There is a reasonable case that it does, particularly as supply reliability has become a more visible concern for buyers. The relationship between water resilience investments and property value in Johannesburg is nuanced — the type, quality and condition of the infrastructure matters as much as its presence. A poorly installed or neglected system can be a liability rather than an asset, which is why condition matters as much as existence.
Sources & notes
Pricing reflects typical Johannesburg market ranges and is confirmed by installer quotation. References: City of Johannesburg