Cape Town Dam Levels Drop to 47.8% as Water Restrictions Loom

Cape Town's six major supply dams held 47.8% of capacity on April 1, according to the City of Cape Town's weekly water dashboard. The figure represents a 14.2-percentage-point decline from the same date in 2025, when dams stood at 62%.

The city said that if levels reach 40% — projected for mid-May at current consumption rates — it would impose Level 3 water restrictions, limiting household use to 105 litres per person per day and banning garden irrigation entirely.

Dry Winter Forecast

The South African Weather Service issued a seasonal forecast on March 28 predicting below-normal rainfall for the Western Cape through August. The province receives most of its water during the austral winter months of May through September.

"The outlook is concerning," said Dr. Piotr Wolski, a hydrologist at the University of Cape Town's Climate System Analysis Group. "We are entering the recharge season with dam levels significantly lower than the long-term average, and the forecast does not favour a strong recovery."

The Theewaterskloof Dam, which supplies more than 40% of Cape Town's water, stood at 39.1% on April 1. Berg River Dam was at 64.3%, and the Wemmershoek at 52.8%, according to the city's data.

Echoes of Day Zero

The figures evoke Cape Town's 2018 "Day Zero" crisis, when dam levels fell to 19.5% and the city came within weeks of shutting off municipal water supply. That crisis prompted emergency water-saving measures, desalination plants, and groundwater drilling.

Since 2018, the city has added three temporary desalination plants and expanded groundwater extraction, bringing total water supply from non-dam sources to approximately 16% of demand, according to the city's water resilience plan.

Deputy Mayor Eddie Andrews told a media briefing on Tuesday that the city was "far better prepared than in 2017-18" but urged residents to reduce consumption immediately. "We are averaging 620 million litres per day," Andrews said. "Our target is 550 million. That gap must close."

Agriculture Pressure

The Western Cape accounts for roughly 55% of South Africa's agricultural exports, including wine, fruit, and wheat. The region's farmers used 43% of the province's total water allocation in 2025, according to the Western Cape Department of Agriculture.

Agri Western Cape, the province's main farming body, said on Monday that irrigated agriculture had already reduced water use by 20% in response to voluntary conservation appeals. But Carl Memory, the organization's CEO, told News24 that further cuts "would mean fallowing productive land and losing export income."

The wine industry, which earned South Africa 11.2 billion rand ($610 million) in exports in 2025, faces particular pressure. The South African Wine Industry Information and Systems database showed that vineyard irrigation allocations for the 2026 season were cut by 30% compared to the five-year average.

Infrastructure Investment

The City of Cape Town approved a 7.8-billion-rand ($425 million) water investment program in February, including a permanent desalination plant at Koeberg with a capacity of 70 million litres per day, expected to be operational by 2028.

The national Department of Water and Sanitation said in a March statement that it was "monitoring the Western Cape situation closely" and would consider releasing water from the Palmiet transfer scheme if dam levels dropped below 35%.

South Africa's water crisis extends beyond Cape Town. Johannesburg's Rand Water utility has imposed restrictions since October 2025 due to maintenance backlogs at the Vaal Dam system. Durban's eThekwini municipality has experienced intermittent water supply since floods damaged infrastructure in 2022.

The South African Institution of Civil Engineering's 2025 infrastructure report card gave the country's water infrastructure a D grade, citing "chronic underinvestment, aging pipe networks, and a 37% non-revenue water loss rate."

Cape Town's next dam level update is scheduled for April 8. The city said it would announce a decision on formal water restrictions by April 15 if levels continue declining at the current rate.