Denver
Last Johannesburg Water (JW) report: Tue 29 Sep 2026, 20:30. Water from Alexander Park Reservoir.
Alexander Park: short of water on 9 days this year.
From 185 days with a JW report. A typical reservoir or tower in the city had 4.
At 20:30 JW wrote: “On bypass. Supplying fairly. Poor pressure to no water may occur.”
Your street may differ: each report covers a reservoir or tower and the area it feeds, and higher streets lose water first. What JW's words mean
Day by day
In 2026 so far: 9 days short of water for Alexander Park Reservoir, from 185 days with a report. A typical supply in the city, the median one (half had fewer), had 4 days.
Each square is a day, as JW reported it for a supply: a reservoir or tower that JW reports on. The number at the right is the month's days short of water.
In 2026 so far, JW reported Alexander Park Reservoir short of water on 9 days
3 March 2025 to 29 September 2026, from 281 days with a JW report.
- water as normal
- supplying fairly
- JW warned
- low, or weak in places
- short of water
- critically low
- shut for the night
- not on the scale
- no JW report
- still filling in
JW's reported status of the reservoir or tower, not measured water at taps. Boards from March 2025.
Source: Johannesburg Water's System Update boards and notices, read by us. How this record is made.
Cite this figure
watersearch (2026). “In 2026 so far, JW reported Alexander Park Reservoir short of water on 9 days”. Data release 2026-09-29-318d9dca. https://watersearch.co.za/suburb/denver#fig-year
The data as a table
| Month | Days reported | Days in record | Adequate or fair | Poor pressure in places, or low | Warning: no water may occur | Poor pressure to no water | Critically low | Overnight closure |
|---|---|---|---|---|---|---|---|---|
| March 2025 | 18 | 29 | 0 | 0 | 0 | 0 | 2 | 0 |
| April 2025 | 13 | 30 | 12 | 0 | 0 | 0 | 1 | 0 |
| May 2025 | 13 | 31 | 11 | 0 | 0 | 1 | 1 | 0 |
| June 2025 | 28 | 30 | 15 | 6 | 0 | 2 | 5 | 0 |
| July 2025 | 24 | 31 | 21 | 0 | 0 | 0 | 3 | 0 |
| August 2025 | 0 | 31 | 0 | 0 | 0 | 0 | 0 | 0 |
| September 2025 | 0 | 30 | 0 | 0 | 0 | 0 | 0 | 0 |
| October 2025 | 0 | 31 | 0 | 0 | 0 | 0 | 0 | 0 |
| November 2025 | 0 | 30 | 0 | 0 | 0 | 0 | 0 | 0 |
| December 2025 | 0 | 31 | 0 | 0 | 0 | 0 | 0 | 0 |
| January 2026 | 0 | 31 | 0 | 0 | 0 | 0 | 0 | 0 |
| February 2026 | 6 | 28 | 0 | 1 | 0 | 0 | 4 | 1 |
| March 2026 | 20 | 31 | 18 | 0 | 1 | 0 | 0 | 1 |
| April 2026 | 29 | 30 | 27 | 0 | 0 | 0 | 0 | 2 |
| May 2026 | 30 | 31 | 22 | 2 | 0 | 0 | 0 | 6 |
| June 2026 | 29 | 30 | 0 | 29 | 0 | 0 | 0 | 0 |
| July 2026 | 29 | 31 | 0 | 24 | 0 | 2 | 3 | 0 |
| August 2026 | 22 | 31 | 0 | 22 | 0 | 0 | 0 | 0 |
| September 2026 | 20 | 29 | 0 | 19 | 1 | 0 | 0 | 0 |
A day counts as short of water when JW's worst report for it that day was “poor pressure to no water” or “critically low”, as happening or expected (expected most often means higher streets). A warning that it may occur does not count.
In short
The latest JW report on this site is from 29 September 2026; the site last read JW's website on 1 October. Alexander Park Reservoir had a warning of weak water or none. This year Alexander Park Reservoir was short of water on 9 of the 185 days JW reported it. A typical reservoir or tower in the city had 4 such days. No JW notice we have read names Alexander Park Reservoir. None of the 9 passed end dates on its page was met.
Latest JW report
Alexander Park Reservoir, 29 September 2026: a warning of weak water or none at 20:30, on bypass, the worst status in this report (JW: “On bypass. Supplying fairly. Poor pressure to no water may occur”).
JW put it on its website 1 October 2026 at 13:40. JW's page for this board ↗ · JW's image of the board ↗
“On bypass” is JW's term. When JW repaired Hursthill 2 Reservoir from December 2025, it put the reservoir on bypass so that teams could work safely inside, and customers still received water; the news reports said this could bring periods of low pressure or no water (EWN ↗, The Citizen ↗). A reservoir or tower on bypass does not count as back when this page checks JW's end dates.
Also on OurPower ↗.
Where Denver gets its water
JW links Denver to one supply, Alexander Park Reservoir.
| Supply | System | How JW links it to Denver |
|---|---|---|
| Alexander Park Reservoir | Central | Listed on JW's pages, as Denver, Denver Ext.1, Denver Ext.10, Denver Ext.11, Denver Ext.12, Denver Ext.13, Denver Ext.15, Denver Ext.2, Denver Ext.3, Denver Ext.4, Denver Ext.6, Denver Ext.7, Denver Ext.8, Denver Ext.9. Source 1 ↗ Source 2 ↗ |
Outages
JW reported 14 outages on Denver's supply since March 2025. The longest lasted at least 3.8 days. Every outage, with how long it lasted: Alexander Park Reservoir.
JW's end dates
JW posted 10 notices with an end date that list a suburb or system Denver's supply feeds. Most name only suburbs, not the reservoir or tower, so the summary at the top uses only a notice that names the supply itself. By the stated time JW's boards showed the water back on none of the 9 end times that have passed. Each end date against what happened: Alexander Park Reservoir.
Under strain
In 2026 so far, Denver had 12 days under strain: days when JW reported any of its supplies low or worse, or warned that higher-lying areas may lose water. This is a wider count than days short of water.
The network is linked. When a supply runs low, the reservoirs and towers around it carry more. At such times JW's boards sometimes warn of “poor pressure to no water in higher-lying areas”: under strain, higher streets lose water first. JW does not say which streets those are.
What JW's boards cannot tell you
JW's boards report reservoirs and towers, so some things are not in this record:
- Whether water reaches your street or your tap.
- Which streets lose water first: JW warns of higher-lying areas but does not name the streets.
- Why a supply ran low, unless a JW notice gives a reason.
- Pipe bursts, tankers and valve work, which are not on the boards.
Source: JW's System Update boards and notices, read by us. The full list, and how this record is made.