El Nino and Drought in Africa: Water Storage and Treatment When Sources Fail
El Nino drought in Africa is not continental. As of 10 September 2026, NOAA's El Nino Advisory is in force, and for southern Africa FEWS NET expects below-average rainfall and a delayed season from October 2026. Buy storage and treatment for that region now, and read East Africa's forecast separately.
Where is El Nino expected to cause drought in Africa this season?
Southern Africa, from October 2026 to March 2027. That is the region and season the sources name, and nothing here should be stretched beyond it.
The current state first, dated. NOAA's Climate Prediction Center, in its discussion of 10 September 2026, says El Nino is strengthening, with a greater than 90% chance of a very strong event during the 2026-27 northern fall and winter. The WMO's August 2026 update, published 3 September 2026, says El Nino is firmly established and forecast to reach very strong intensity before peaking towards the end of the year. WMO also cautions that the strength of an event does not translate directly into the size of impacts in any one region.
The regional picture comes from FEWS NET. Its El Nino 2026-2027 page lists below-average rainfall and extreme heat for southern Africa over October 2026 to March 2027, naming Zimbabwe, south-central Mozambique, southern Malawi and southern Zambia as areas with a consistent El Nino link. Its southern Africa outlook of June 2026 adds a delayed onset in the Grand Sud of Madagascar, below-average rainfall in southern Malawi, and a late, below-average start in Mozambique and Zambia. FEWS NET's Zimbabwe update for September 2026 says rainfall deficits are expected to limit pasture and water regeneration from late 2026.
East Africa runs the other way for the coming season. The IGAD Climate Prediction and Applications Centre outlook of 18 August 2026 gives a 90% chance of enhanced rainfall over southern Ethiopia, central to southern Somalia and north-eastern Kenya for October to December. FEWS NET's page lists below-average rains in Ethiopia alongside a flood risk in the eastern Horn. A team that reads "El Nino" and buys drought stock for Somalia has read the headline, not the outlook. Our Somalia drought logistics post covers drought supply chains there as a standing problem; this piece is about what the El Nino forecast adds.
Why do storage and treatment matter more than the pump when sources fail?
Because a failing source gives you less water and worse water at the same time, and storage and treatment are the two levers you control in advance. The WHO's Guidelines for drinking-water quality, chapter 6, states that with changes in water quantity come changes in quality, because runoff and sediment loading shift, and that these changes require modifications in storage capacity and treatment. It says treatment systems may need more storage to cope with greater microbial and turbidity loads, and it flags that bulk water brought in during a drought must be checked for safety before it enters a distribution system.
That last point is the one supply teams miss. Water trucking is the default fallback when a borehole drops, and WHO's guidance is that trucked water is a new source with its own contamination risks, including inappropriate containers and poor hygiene at filling points. A tanker is not a treatment plan.
How much water do you actually need to store?
Start from the number, then see how fast a tank empties. WHO's technical note on how much water is needed in emergencies gives a basic survival-level total of 7.5 to 15 litres per person per day (2.5 to 3 for drinking and food, 2 to 6 for basic hygiene, 3 to 6 for cooking), adapted from Sphere. The IFRC's Sphere WASH summary puts the water point within 500 metres of the dwelling.
The arithmetic below is ours, not a sourced figure. A settlement of 5,000 people at 7.5 litres a day uses 37,500 litres, or 37.5 cubic metres, daily. The Oxfam Supply Centre lists steel tanks of 11, 45, 70 and 95 cubic metres, so one 45 cubic metre tank is about 1.2 days of survival-level supply for that settlement. At 15 litres a day the same population needs 75 cubic metres daily, more than a 70 cubic metre tank holds.
The point of view that follows: storage buys days, not weeks. A month of survival-level supply for 5,000 people is about 1,125 cubic metres, which is 25 tanks of 45 cubic metres. Nobody sensible stores a month on site. Tanks exist to smooth a source that fails intermittently, to hold trucked or pumped water between deliveries, and to let you treat in batches. If the source is gone, the plan is a new source, and storage is how you survive the gap. For sizing by population, our camp water storage sizing guide goes further.
How should treatment change when water gets scarcer?
Treat at the point where recontamination happens, and raise the margin. A tank filled with disinfected water is only safe if the residual survives the trip to the cup, and the evidence from South Sudan says it often does not. A Bulletin of the WHO study of refugee camps found that 40 to 58% of households collecting from chlorinated tapstands had no detectable residual chlorine in their stored water. The authors tentatively recommended raising the free residual chlorine guideline to 1.0 mg/L, which their modelling suggested would hold 0.2 mg/L for at least 10 hours after distribution.
The standard to measure against is in the IFRC's Sphere summary: free chlorine of at least 0.5 mg/L after 30 minutes contact at pH below 8, and no less than 0.2 mg/L at the point of delivery, with turbidity at or below 5 NTU. Low-flow, hot, silty water makes both numbers harder, which is why we would test at the household container and not only at the tap.
Product choice follows turbidity, and drought pushes turbidity up as sources shrink:
Clear water, household scale: Aquatabs 67mg. The manufacturer's instruction sheet, hosted by the US CDC, says one tablet treats 8 to 10 litres of clear water with 30 minutes contact. For tank-scale dosing, see our NaDCC dosing guide.
Turbid, dirty water: P&G Purifier of Water. CSDW describes a sachet turning 10 litres of dirty water into drinkable water by coagulation, flocculation and disinfection, with 99.9% protozoa removal claimed for the product.
Do not assume tablets fix cloudy water. The same instruction sheet tells users to treat clear water, and the sachet is the product built for the turbid case.
What should supply teams pre-position, and when?
Before the rains fail, not after. UNICEF's August 2026 El Nino readiness note for Eastern and Southern Africa, which draws on WMO, NOAA, regional outlook forums and FEWS NET, calls for pre-positioning critical WASH supplies across Southern Africa and Madagascar before drought and its related nutrition impacts intensify. The WFP says the same logic in practice: its 5 August 2026 analysis reports anticipatory action plans triggered since May 2026 in South Sudan, Chad, Mauritania, Uganda, Guatemala and El Salvador.
A practical pre-positioning list, from what we hold and deliver:
Storage: Oxfam steel tanks and Butyl bladder tanks in the sizes your demand sum supports, with covers fitted. The WHO drinking-water fact sheet says covering storage containers can reduce vector breeding and may also reduce faecal contamination.
Household treatment: Aquatabs where water is clear, P&G sachets where it is not, both sized to the number of households and the months at risk.
Testing: free residual chlorine test kits, because a residual that is not measured is assumed.
A treatment step for trucked water: per WHO, treat it as a new source on arrival.
We are an in-country authorised distributor in Juba, and our stock and delivery are built around South Sudan and the surrounding region, where WFP has already triggered anticipatory action. The southern African countries named above are a long way from that footprint, so if you are buying for Zimbabwe, Malawi, Mozambique or Zambia, ask us what we can quote for delivery to your location rather than assuming a Juba lead time. Our case studies show how a delivery chain of this type has worked in practice.
Frequently asked questions
Where in Africa is El Nino expected to bring drought in 2026-27?
FEWS NET's El Nino 2026-2027 page lists below-average rainfall and extreme heat for southern Africa from October 2026 to March 2027, naming Zimbabwe, south-central Mozambique, southern Malawi and southern Zambia. The IGAD Climate Prediction and Applications Centre outlook of 18 August 2026 expects wetter-than-normal conditions across much of the Greater Horn from October to December.
What is the El Nino status right now?
As of 10 September 2026, NOAA's Climate Prediction Center had an El Nino Advisory in force and a greater than 90% chance of a very strong event in 2026-27. The WMO's update of 3 September 2026 says El Nino is firmly established.
How much water does a person need in a drought emergency?
WHO gives 7.5 to 15 litres per person per day as the basic survival-level total for drinking, hygiene and cooking, in its technical note on emergency water quantities.
What free residual chlorine should stored water hold?
The IFRC's Sphere WASH summary gives at least 0.5 mg/L after 30 minutes contact at pH below 8, and no less than 0.2 mg/L at the point of delivery. A Bulletin of the WHO study in South Sudan refugee camps found 40 to 58% of households had no detectable residual in stored water.
Should trucked water be treated?
Yes. WHO's drinking-water guidelines, chapter 6, says water brought in during a drought or emergency must be checked for safety before it enters the receiving supply, and names inappropriate containers and poor hygiene at transfer points as added contamination risks.
Related reading
Specialized Logistics Solutions is the in-country Juba authorised distributor, with 35 years of supply-chain experience in high-risk environments, authorised for Aquatabs (Medentech/Kersia), P&G Purifier of Water, Oxfam tanks and Butyl, Multiquip and Aussie Pumps and Hallgruppen structures, and a UNGM-registered vendor (No. 380716). In the 2024-2025 South Sudan response we deployed 52M+ Aquatabs and 3.28M P&G PUR sachets. Request a quotation from SLS with your population, months at risk and delivery location, and we will quote the storage and treatment to match.
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