1001 Smart Cities

Permanent project revision

Johannesburg Water: Pressure Control and Night-Flow Telemetry Against Water Losses

Revision 2026-10-11-reverify · effective 2026-10-11

Superseded. A later revision exists: 2026-10-13-editorial-decisions →

unreviewed

Deep Run 2026-10-11: every source re-read and dated, present-tense statements dated, claim array completed; impact: Misattributed quotation. The quoted sentence does not occur in the Auditor-General's report (full text searched for 'consistently reaching', 'over 45%', 'remained above'); it is GroundUp's own summary. The report itself carries 'Water losses R10,30bn (4 years more than 30% norm)' in the City of Johannesburg profile. The facts stand; the quotation marks were wrong. This replaces the entry's one existing claim passage.; snippet: Tense ahead of the source. The utility's release says it 'has initiated a project to retrofit' the flow controls and that they 'will automatically throttle reser

sha256:6fe7a6067a8aa4953370c860691e815aa284644aa671bc4e37269d359fd4e10a
All revisions → Current entity page →

Change set

  • replace /snapshot/projectFingerprint — Updated projectFingerprint to the current sourced project record.
  • replace /snapshot/asOf — Updated asOf to the current sourced project record.
  • replace /snapshot/claims — Updated claims to the current sourced project record.
  • replace /snapshot/sources — Updated sources to the current sourced project record.
18
of 18 claims mapped
16
source dossiers
15
publication dates recorded
1
archives linked
0
exact locators
0
content captures hashed

Claims, one by one

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-03b5c9bdac623120 descriptive
Johannesburg Water, a municipal entity of the City of Johannesburg, distributes water it buys in bulk from Rand Water
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city's 2024/25 integrated annual report reports Johannesburg Water among its municipal entities and states that, as at the end of June 2025, it supplied an average of 1,700 megalitres a day of potable water procured from Rand Water through 12,526 km of pipes, 111 reservoirs and towers and 31 pump stations.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. City of Johannesburg — Integrated Annual Report 2024/25 (Council version, approved January 2026)
Claim 2 clm-f15d6b3f185b1d73 quantitative
Its own 2023/24 annual report put non-revenue water at 46.2 percent, roughly half of that physical leakage
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The fact-check reads the figure from the 2023/24 annual report (46.2%, of which 24.8% physical losses); the city's 2024/25 report states the prior-year comparatives as 46.18% non-revenue water and 24.83% physical losses; the press report gives 46.2% with physical losses 'about 24%'.
Caveat
'Roughly half' is the entry's rounding of 24.8 of 46.2 points.

Sources carrying this claim

  1. Africa Check — fact-check of claims about Johannesburg's water crisis (independent fact-checking organisation)
  2. City of Johannesburg — Integrated Annual Report 2024/25 (Council version, approved January 2026)
  3. Daily Maverick — How a burst pipe in Randburg exposes Joburg's deepening water crisis (12 Aug 2025)
Claim 3 clm-a705661ea66bf7b8 quantitative
By July 2026 it had commissioned 53 smart pressure controllers with 306 more being installed, fitted 225 acoustic noise loggers on critical pipelines, and begun retrofitting smart hydraulic flow controls on 28 high-consumption reservoirs and towers
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The utility's release of 23 July 2026 states the total of 53 smart pressure controllers, 306 more procured and being installed to the end of September 2026, 225 noise loggers installed on critical pipelines, and a project initiated to retrofit smart hydraulic flow controls on 28 high-consumption reservoirs and towers. The trade site reproduces the release in full.
Caveat
All counts are the utility's own. Its arithmetic does not add up on its face — 15 units in 2023/24 plus 13 by April 2025 is 28, yet the stated total is 53 — so the 53 is reported as the utility states it, not as a sum.

Sources carrying this claim

  1. Johannesburg Water — Johannesburg Water accelerates smart technology rollout to reduce water losses (media release, 23 July 2026)
  2. Infrastructure News — Johannesburg Water accelerates smart technology rollout to reduce water losses (23 July 2026)
Claim 4 clm-ba985d7b06627210 descriptive
the flow controls are to throttle reservoir outlets automatically at night to cut minimum night flow losses and rebuild storage before morning
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The release describes the purpose of the flow controls: 'These will automatically throttle reservoir outlets in order to reduce minimum night flow losses and build reservoir capacity overnight.'
Caveat
Future tense in the source: the project is 'initiated', and no source says how many of the 28 outlets were fitted by October 2026.

Sources carrying this claim

  1. Johannesburg Water — Johannesburg Water accelerates smart technology rollout to reduce water losses (media release, 23 July 2026)
Claim 5 clm-ad6c7ef9a64c7838 quantitative
Overnight throttling of supply between 21:00 and 04:00 has been in force since 14 November 2024 so that reservoirs can recover
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The November 2024 report carries the start date (14 November), the hours (21:00 to 04:00), the purpose (reservoir levels recovering overnight) and the condition for ending it (full system recovery); the February 2026 report lists night-time throttling among the measures 'already underway'.
Caveat
Whether the 21:00–04:00 window was still applied unchanged in October 2026 is not stated by any source read.

Sources carrying this claim

  1. Engineering News — Overnight water throttling part of new measures to combat Joburg's water challenges (12 Nov 2024)
  2. Engineering News — Nighttime water throttling, restrictions, leak detection among efforts to reverse Joburg's water woes (11 Feb 2026)
Claim 6 clm-e987385078b80df7 quantitative
A 24-hour telemetry system with two staffed control rooms watches reservoirs and pump stations, as the utility described it in November 2024
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
Answering residents' questions at a briefing on 28 November 2024, the utility's demand-management manager said: 'JW employs a 24-hour telemetry system with two control rooms staffed around the clock. This system monitors signals from reservoirs and pump stations, alerting staff to issues such as power failures or low water levels.'
Caveat
The same answer concedes that response to an alert can take over a week under high demand.

Sources carrying this claim

  1. Northcliff Melville Times / The Citizen — Johannesburg Water answers residents' questions on the water crisis (7 Dec 2024)
Claim 7 clm-ca0f85487ac883a4 quantitative
The audited figure for 2024/25 was 44.8 percent, which the city called a modest improvement; the unaudited figure for 2025/26, given to Parliament in September 2026, was 47.1 percent
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The annual report states 'The audited 2024/25 non-revenue water is 44.8%' and, in its financial analysis, 44.79% against 46.18% the year before, 'a modest but important improvement'. The ministerial reply of 4 September 2026 gives the unaudited 2025/26 figure as 47.1%.
Caveat
The 2025/26 figure is unaudited and was supplied to the department by the city.

Sources carrying this claim

  1. City of Johannesburg — Integrated Annual Report 2024/25 (Council version, approved January 2026)
  2. Parliamentary Monitoring Group — Reply by the Minister of Water and Sanitation to question NW4784 on Johannesburg's water losses (4 Sep 2026)
Claim 8 clm-a2150a9929634136 quantitative
The Auditor-General found losses above the national 30 percent norm for four straight years and notified the city of a material irregularity in December 2024
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The report's City of Johannesburg profile records 'Water losses R10,30bn (4 years more than 30% norm)', and its material-irregularity box on Johannesburg Water says 'we notified the accounting officer of an MI in December 2024'. GroundUp reports both on the day of publication.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Auditor-General of South Africa — Consolidated General Report on Local Government Audit Outcomes 2024-25 (tabled 24 June 2026)
  2. GroundUp — Joburg watches R10-billion flow down the drain (24 June 2026), reporting the Auditor-General
Claim 9 clm-a6e41b0ff75880c5 quantitative
When taps ran dry across Johannesburg in 2024 and 2025, both layers were implicated: Rand Water restricted bulk volumes to protect its own storage, while the city's reservoirs could not refill overnight
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
In November 2024 the minister said Rand Water 'is not able to supply any more water to municipalities in Gauteng than it is currently supplying' and that overnight throttling was needed for reservoirs to recover; in February 2025 Rand Water reported its storage down from nearly 70% to below 40%, Johannesburg's consumption above both its temporary and permanent allocations, and called for cuts 'to avoid system collapse'. The utility's November 2024 answers describe reservoirs that cannot recover under demand, and the August 2025 report describes a reservoir and tower running dry for nearly three days.
Caveat
'Restricted bulk volumes' rests on the allocation ceilings and Rand Water's warning; a February 2026 report that Rand Water would reduce supply to high-consuming areas appeared on a site this entry could not read.

Sources carrying this claim

  1. Engineering News — Overnight water throttling part of new measures to combat Joburg's water challenges (12 Nov 2024)
  2. Engineering News — Rand Water warns of extremely high water demand, reservoirs depleting rapidly (13 Feb 2025)
  3. Daily Maverick — How a burst pipe in Randburg exposes Joburg's deepening water crisis (12 Aug 2025)
  4. Northcliff Melville Times / The Citizen — Johannesburg Water answers residents' questions on the water crisis (7 Dec 2024)
Claim 10 clm-7167709578735168 quantitative
The Auditor-General of South Africa, in the Consolidated General Report on Local Government Audit Outcomes 2024/25 (tabled 24 June 2026), recorded Johannesburg's water losses at R10.30-billion over four years, each of them above the 30% norm; GroundUp, reporting the publication, summarised the finding as losses that "remained above the 30% norm for the past four years, with recent levels consistently reaching over 45%"
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The report's City of Johannesburg profile carries 'Water losses R10,30bn (4 years more than 30% norm)'. GroundUp's report of the same day reads: 'The metro's water losses have remained above the 30% norm for the past four years, with recent levels consistently reaching over 45%.'
Caveat
The quoted sentence is GroundUp's summary, not the report's wording; the 45% level itself is the Auditor-General's figure for 2024-25, given in the Scopa briefing.

Sources carrying this claim

  1. Auditor-General of South Africa — Consolidated General Report on Local Government Audit Outcomes 2024-25 (tabled 24 June 2026)
  2. GroundUp — Joburg watches R10-billion flow down the drain (24 June 2026), reporting the Auditor-General
Claim 11 clm-21761988c6ba0ed4 quantitative
Johannesburg Water's own 2023/24 annual report put non-revenue water at 46.2%, of which 24.8 percentage points were physical leakage, 9.7 commercial losses and 11.7 unbilled authorised consumption
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The fact-check reads the breakdown from the 2023/24 annual report; the city's 2024/25 report states the same prior-year comparatives at two decimals — 46.18%, physical losses 24.83%, commercial losses 9.66%, unbilled authorised consumption 11.69%.
Caveat
The fact-check site declines automated reading, so its sentence is confirmed through the city's own prior-year comparatives rather than re-read on the page.

Sources carrying this claim

  1. Africa Check — fact-check of claims about Johannesburg's water crisis (independent fact-checking organisation)
  2. City of Johannesburg — Integrated Annual Report 2024/25 (Council version, approved January 2026)
Claim 12 clm-9a0aa327dbc86798 quantitative
The City's Integrated Annual Report 2024/25 put the audited figure for the year to June 2025 at 44.79% (R3.8-billion): physical losses 23.72% (R2-billion), commercial losses 9.22% (R790-million), unbilled authorised consumption 11.85% (R1-billion)
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
Section 5 of the report: 'The level of Non-Revenue Water (NRW) for the year under review to June 2025 is 44.79% (R3.8 billion)'; physical losses 23.72% (R2 billion); commercial losses 9.22% (R790 million); unbilled authorised consumption 11.85% (R1 billion).
Caveat
The report rounds the same figure to 44.8% elsewhere; both are the city's own audited numbers.

Sources carrying this claim

  1. City of Johannesburg — Integrated Annual Report 2024/25 (Council version, approved January 2026)
Claim 13 clm-9beda47344618771 quantitative
The Auditor-General's briefing to Parliament's public accounts committee on 29 May 2026 recorded material water losses of 45%, R2.8-billion, of which R2-billion was leaks
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The slides state 'Material water losses of (45%) – R2,8bn' for Johannesburg Water and break them down: 'R2bn relates to losses attributable to leaks on the water network infrastructure' and 'R790m was primarily due to illegal connections, metering inaccuracies and billing errors'.
Caveat
The 45% is the Auditor-General's water-loss measure (physical plus commercial), not the city's non-revenue-water figure, which also counts unbilled authorised consumption.

Sources carrying this claim

  1. Auditor-General of South Africa — Briefing to Scopa on the 2024-25 audit outcome for the City of Johannesburg (29 May 2026)
Claim 14 clm-6b1b734c27fceca5 quantitative
For 2025/26 the Department of Water and Sanitation told Parliament in September 2026 that unaudited non-revenue water was 47.1%, with physical losses estimated at R2.4-billion
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The written reply: 'Non-Revenue Water for the 2025/2026 fiscal year (un-audited) is 47.1% and equates to 295 146 398 kL', with physical losses 'estimated to be 157 359 208 kL or R2.4 billion', valued at the Rand Water purchase rate.
Caveat
Unaudited, and the city's own estimate relayed by the department.

Sources carrying this claim

  1. Parliamentary Monitoring Group — Reply by the Minister of Water and Sanitation to question NW4784 on Johannesburg's water losses (4 Sep 2026)
Claim 15 clm-e256ffb1afd2cc70 quantitative
Johannesburg is fitting the same pressure-and-metering toolkit that took Istanbul from 22.3% to 18.6%
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
Istanbul's utility reported its loss and leakage rate at 22.31% in 2019 and 18.63% at the end of 2024, after investment in metering areas and modelling; Johannesburg Water's release describes pressure controllers on pressure-reducing-valve zones, flow controls and leak loggers.
Caveat
'The same toolkit' is the entry's comparison, not a statement by either utility; Istanbul's figure is a water-loss rate, Johannesburg's headline figure is non-revenue water.

Sources carrying this claim

  1. Sözcü — İSKİ açıkladı: Yüzde 18,63'e düştü (22 Feb 2025)
  2. Johannesburg Water — Johannesburg Water accelerates smart technology rollout to reduce water losses (media release, 23 July 2026)
Claim 16 clm-068f25924a2ad133 quantitative
a network whose losses have not come down while the work was under way — 46.2 percent in 2023/24, 44.8 in 2024/25, an unaudited 47.1 in 2025/26
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city's report gives 46.2% for 2023/24 and 44.8% for 2024/25; the ministerial reply gives an unaudited 47.1% for 2025/26.
Caveat
2025/26 is unaudited.

Sources carrying this claim

  1. City of Johannesburg — Integrated Annual Report 2024/25 (Council version, approved January 2026)
  2. Parliamentary Monitoring Group — Reply by the Minister of Water and Sanitation to question NW4784 on Johannesburg's water losses (4 Sep 2026)
Claim 17 clm-641929b87d3eb92c descriptive
the Auditor-General blamed deferred maintenance rather than missing sensors
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The material-irregularity box names 'the entity's failure to proactively maintain its water infrastructure', 'inadequate maintenance planning, poor execution of planned maintenance activities and insufficient oversight'; GroundUp reports that maintenance 'is often deferred until assets fail'.
Caveat
'Rather than missing sensors' is the entry's contrast; the report does not discuss instrumentation.

Sources carrying this claim

  1. Auditor-General of South Africa — Consolidated General Report on Local Government Audit Outcomes 2024-25 (tabled 24 June 2026)
  2. GroundUp — Joburg watches R10-billion flow down the drain (24 June 2026), reporting the Auditor-General
Claim 18 clm-bb2e3eb3c32b6518 descriptive
Telemetry sets the repair priority; it does not do the repair.
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The utility describes the loggers' role in exactly this order: they 'detect underground leaks. Maintenance teams can thereafter be deployed to perform related repairs.'
Caveat
An editorial conclusion drawn from the utility's own description of the workflow.

Sources carrying this claim

  1. Johannesburg Water — Johannesburg Water accelerates smart technology rollout to reduce water losses (media release, 23 July 2026)

Source dossiers and revision state

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-10-11-reverify effective 2026-10-11 · created 2026-10-11

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:6fe7a6067a8aa4953370c860691e815aa284644aa671bc4e37269d359fd4e10a
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
18
of 18 claims mapped
16
source dossiers
15
publication dates recorded
1
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
Johannesburg Water SOC Ltd (municipal entity of the City of Johannesburg); bulk supply from Rand Water
Actor types
utility
Funding model
public
Funding description
City of Johannesburg / Johannesburg Water capital and operating budget
Cost
Programme cost not published; city put its 2026 water infrastructure budget at R1.7bn against a R27bn backlog
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

16 source dossiers

Africa Check — fact-check of claims about Johannesburg's water crisis (independent fact-checking organisation) africacheck.org · 2 linked claims

Open original source ↗

Stable source ID
src-2ef9bb61a007e1b8
Publisher
Name not classified · africacheck.org
Type / language
web-page · language not classified
Published
2025-10-06
Updated
2025-11-19
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Verifies the primary figure against the source document: "Johannesburg Water's 2023/24 annual report recorded a non-revenue water figure of 46.2%", with the breakdown 24.8% physical losses, 9.7% commercial losses, 11.7% unbilled authorised consumption. Also rates as correct the claim that the city replaced 17 km of pipe in 2023/24 against a stated need of 175 to 185 km a year.

Descriptive only — not page/paragraph exact
Claims linked
GroundUp — Joburg watches R10-billion flow down the drain (24 June 2026), reporting the Auditor-General groundup.org.za · 3 linked claims

Open original source ↗

Stable source ID
src-4f36bfc7bf6cd3cc
Publisher
Name not classified · groundup.org.za
Type / language
web-page · language not classified
Published
2026-06-24
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
Open archived copy ↗ · 2026-06-27
Content hash
No captured content hash
Locator
Open the recorded source note

Press report of the Auditor-General's Consolidated General Report on Local Government Audit Outcomes 2024/25 on the day of publication: "Johannesburg has lost R10.3-billion worth of drinking water in four years"; the metro's losses "remained above the 30% norm for the past four years, with recent levels consistently reaching over 45%" (GroundUp's summary, not a quotation from the report); the AG's finding of a "failure to proactively maintain its water infrastructure"; material irregularity notified December 2024; the utility's ten-year, R64-billion strategy.

Descriptive only — not page/paragraph exact
Claims linked
Infrastructure News — Johannesburg Water accelerates smart technology rollout to reduce water losses (23 July 2026) infrastructurenews.co.za · 1 linked claim

Open original source ↗

Stable source ID
src-190d9c3647d190b4
Publisher
Name not classified · infrastructurenews.co.za
Type / language
web-page · language not classified
Published
2026-07-23
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Reproduces Johannesburg Water's media release of the same day in full: 15 smart pressure controllers commissioned in 2023/24, 13 more by April 2025, a stated total of 53, 306 more being installed to the end of September 2026; 225 noise loggers installed, 125 more by October 2026; smart hydraulic flow controls being retrofitted on 28 high-consumption reservoirs and towers. Logan Munsamy, Senior Manager for Water Demand Management and Technical Metering, quoted on lowering minimum night flow losses.

Descriptive only — not page/paragraph exact
Claims linked
Johannesburg Water — Johannesburg Water accelerates smart technology rollout to reduce water losses (media release, 23 July 2026) johannesburgwater.co.za · 4 linked claims

Open original source ↗

Stable source ID
src-4cfa5666aad527d7
Publisher
Name not classified · johannesburgwater.co.za
Type / language
web-page · language not classified
Published
2026-07-23
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The utility's own statement of the instrumentation counts: 15 smart pressure controllers commissioned in 2023/24, a further 13 as of April 2025 "bringing the total to 53 units", 306 more procured and being installed to the end of September 2026; 225 noise loggers installed and 125 more planned by October 2026; a project initiated to retrofit smart hydraulic flow controls on the outlets of 28 high-consumption reservoirs and towers that "will automatically throttle reservoir outlets" to reduce minimum night flow losses. States that maintenance teams are deployed to repair the leaks the loggers detect.

Descriptive only — not page/paragraph exact
Claims linked
Engineering News — Nighttime water throttling, restrictions, leak detection among efforts to reverse Joburg's water woes (11 Feb 2026) engineeringnews.co.za · 1 linked claim

Open original source ↗

Stable source ID
src-1edc73a20337425c
Publisher
Name not classified · engineeringnews.co.za
Type / language
web-page · language not classified
Published
2026-02-11
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Current state and money: Executive Mayor Dada Morero on the city needing to reach 1 550 Ml/d to comply with Rand Water licence apportionment; R1.7-billion 2026 budget against a R27-billion infrastructure backlog; night-time throttling, bulk meter restrictions, pressure management and leak detection named as measures already under way.

Descriptive only — not page/paragraph exact
Claims linked
Northcliff Melville Times / The Citizen — Johannesburg Water answers residents' questions on the water crisis (7 Dec 2024) citizen.co.za · 2 linked claims

Open original source ↗

Stable source ID
src-4e63faca1f82f33b
Publisher
Name not classified · citizen.co.za
Type / language
web-page · language not classified
Published
2024-12-07
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Telemetry layer, in the utility's own words at a briefing on 28 November 2024: "JW employs a 24-hour telemetry system with two control rooms staffed around the clock", monitoring "signals from reservoirs and pump stations, alerting staff to issues such as power failures or low water levels". Also attributes consumption misreading to ageing meters and says 22 reservoirs were identified as significant sources of leaks.

Descriptive only — not page/paragraph exact
Claims linked
The Conversation — Craig Sheridan, Chair professor, University of the Witwatersrand (2024) theconversation.com · background

Open original source ↗

Stable source ID
src-b73371ac38b4a6b7
Publisher
Name not classified · theconversation.com
Type / language
web-page · language not classified
Published
2024-02-27
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Independent academic on the bulk-versus-distribution split: Rand Water buys from the Department of Water and Sanitation, mainly from the Vaal Dam, and sells to the cities; "a mismatch between what's allocated by the national government and what's needed on the ground"; maintenance bill of R2-billion a year against R1-billion allocated; Lesotho Highlands Phase 2 eight years late. NOTE: this source's 49.2% non-revenue water and 279 l/person/day are GAUTENG PROVINCE figures and are deliberately not used as Johannesburg figures in this entry.

Descriptive only — not page/paragraph exact
Claims linked
Background source; no baseline claim points here
Auditor-General of South Africa — Consolidated General Report on Local Government Audit Outcomes 2024-25 (tabled 24 June 2026) agsa.co.za · 3 linked claims

Open original source ↗

Stable source ID
src-c3ff52ac7ca47e92
Publisher
Name not classified · agsa.co.za
Type / language
pdf · language not classified
Published
2026-06-24
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The audit office's own report. City of Johannesburg profile: "Water losses R10,30bn (4 years more than 30% norm)". Material-irregularity box on Johannesburg Water: "the entity's failure to proactively maintain its water infrastructure", resulting in "frequent pipe bursts and deteriorating network reliability"; "we notified the accounting officer of an MI in December 2024". Also states that the eight metros' estimated water losses in 2024-25 totalled R9,89 billion (39% average).

Descriptive only — not page/paragraph exact
Claims linked
City of Johannesburg — Integrated Annual Report 2024/25 (Council version, approved January 2026) joburg.org.za · 6 linked claims

Open original source ↗

Stable source ID
src-7d1df91adaa553dc
Publisher
Name not classified · joburg.org.za
Type / language
pdf · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-11
Dossier created
2026-10-11
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The city's audited figures for the year to June 2025: non-revenue water 44.79% (R3.8 billion) against 46.18% (R3.9 billion) the year before, "a modest but important improvement"; water losses 32.94% (R2.8 billion); physical losses 23.72% (R2 billion) against 24.83% (R2.1 billion) in 2024; commercial losses 9.22% (R790 million) against 9.66%; unbilled authorised consumption 11.85% (R1 billion) against 11.69%. Johannesburg Water's section states "The audited 2024/25 non-revenue water is 44.8%" and lists pressure management, advanced leak detection and minimum-night-flow reduction among its water-demand measures.

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Auditor-General of South Africa — Briefing to Scopa on the 2024-25 audit outcome for the City of Johannesburg (29 May 2026) pmg.org.za · 1 linked claim

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src-2ef8a27219e8d01d
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Name not classified · pmg.org.za
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pdf · language not classified
Published
2026-05-29
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2026-10-11
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2026-10-11
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Slides presented to Parliament's Standing Committee on Public Accounts: "Material water losses of (45%) – R2,8bn" at Johannesburg Water, of which "R2bn relates to losses attributable to leaks on the water network infrastructure" and "R790m was primarily due to illegal connections, metering inaccuracies and billing errors"; maintenance expenditure 4% against an 8% norm.

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Parliamentary Monitoring Group — Reply by the Minister of Water and Sanitation to question NW4784 on Johannesburg's water losses (4 Sep 2026) pmg.org.za · 3 linked claims

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src-274483dd1bc737ec
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Name not classified · pmg.org.za
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web-page · language not classified
Published
2026-09-04
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2026-10-11
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2026-10-11
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Written reply: "Non-Revenue Water for the 2025/2026 fiscal year (un-audited) is 47.1% and equates to 295 146 398 kL"; physical losses estimated at 157 359 208 kL or R2.4 billion, commercial losses R939 million, unbilled authorised consumption R1,17 billion, valued at the Rand Water purchase rate; the city indicated a maintenance backlog of R9.1 billion. Identifies Johannesburg Water as the city's entity for water services.

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Engineering News — Overnight water throttling part of new measures to combat Joburg's water challenges (12 Nov 2024) engineeringnews.co.za · 2 linked claims

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src-3e352b1fcb7b1d50
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Name not classified · engineeringnews.co.za
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web-page · language not classified
Published
2024-11-12
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2026-10-11
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Reports the minister's briefing: Johannesburg Water to throttle supply between 21:00 and 04:00 from 14 November 2024 "until the system has fully recovered" so that reservoir levels recover overnight; "Rand Water is already abstracting water at its set limits from the Integrated Vaal River System and is not able to supply any more water"; peak demand close to, and occasionally exceeding, the available supply.

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Engineering News — Rand Water warns of extremely high water demand, reservoirs depleting rapidly (13 Feb 2025) engineeringnews.co.za · 1 linked claim

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src-2f269fd60c70a86f
Publisher
Name not classified · engineeringnews.co.za
Type / language
web-page · language not classified
Published
2025-02-13
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2026-10-11
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2026-10-11
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Rand Water's statement: its storage dropped from nearly 70% to below 40% after 19 January 2025; Johannesburg's consumption reached 1 743 Ml/d by 3 February, above its temporary allocation of 1 528 Ml/d and permanent allocation of 1 356 Ml/d; customers called on to cut consumption "to avoid system collapse".

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Daily Maverick — Minister approves emergency measures to curb Joburg's water crisis (19 Feb 2026) dailymaverick.co.za · background

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src-b370602d86bc27a3
Publisher
Name not classified · dailymaverick.co.za
Type / language
web-page · language not classified
Published
2026-02-19
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2026-10-11
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2026-10-11
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Level 2 restrictions in high-use areas, controlled throttling of supply overnight, and a temporary abstraction licence giving Rand Water an additional 200 million cubic metres a year until June 2026; Rand Water's 7 February statement that Johannesburg and Tshwane had "exceeded the allocated volumes"; parts of Johannesburg without water for up to 25 days; Johannesburg consuming 1,657 Ml/d in the week of 16 February against 1,500 Ml/d under the temporary licence and 1,350 Ml/d under the permanent one.

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Daily Maverick — How a burst pipe in Randburg exposes Joburg's deepening water crisis (12 Aug 2025) dailymaverick.co.za · 2 linked claims

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Stable source ID
src-f6f78c7025d53fe8
Publisher
Name not classified · dailymaverick.co.za
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web-page · language not classified
Published
2025-08-12
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2026-10-11
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2026-10-11
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A bulk pipe that burst for the fourth time in two years left the Northcliff reservoir and tower dry and parts of Northcliff without water for nearly three days in August 2025; "Johannesburg Water reports that 46.2% of supplied water is non-revenue, with physical losses from leaks and bursts accounting for about 24%"; the utility receives about 100 reported leaks a day.

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Sözcü — İSKİ açıkladı: Yüzde 18,63'e düştü (22 Feb 2025) sozcu.com.tr · 1 linked claim

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Stable source ID
src-9d5ab9122ccdaddb
Publisher
Name not classified · sozcu.com.tr
Type / language
web-page · language not classified
Published
2025-02-22
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2026-10-11
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2026-10-11
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Istanbul's utility İSKİ reported its water loss and leakage rate fell from 22.31% in 2019 to 18.63% at the end of 2024, giving the full annual series; cited for the comparison in the lesson.

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