Rand Water | Integrated Annual Report 2025

INTEGRATED ANNUAL REPO

Growth in supply volumes The 5-year trend in Figure 17 reflects a modest 1.03% annual supply growth since 2021, indicating minimal demand growth.

Five-Year trend in supply volume

y=47.333x+4357.8 R 2 = 0.9284

0% 2% 4% 6% 8% 120% 12%

100% 120% 140% 140%

growth over 5 years= 1.03%

20% 40% 60% 80%

Volume (MI/d)

0%

% excess over the license target

2021 4408 4169 6%

2022 4445 4169 7%

2023 4521 4169 8%

2024 4516 4169 8%

2025 4609 4169 11%

Total supply volumes Project 1600 target percentage exceeding 1600 target

Figure 17: Five-Year trend in water supply volume

Although the demand has grown by 1.03% over the five (5) years, it should be noted that the demand exceeds the 1600 target in this period. CUSTOMER DEMAND MANAGEMENT Project 1600 Project 1600 is a strategic initiative by Rand Water aimed at enhancing water use efficiency across its supply area, with the primary goal of reducing abstraction from the IVRS and aligning with the DWS annual abstraction limit of 1600 million m³. The initiative is grounded in a scientifically developed in-house water use efficiency model, which estimates expected demand and compares it to actual supply volumes to assess customer efficiency. Key objectives of Project 1600 include: • Establishing fair and equitable supply allocations (Project 1600 targets) for each municipality. • Monthly monitoring of municipal performance against these targets. • Identifying priority areas for Water Demand Management (WDM) interventions, with municipalities providing quarterly updates at the Project 1600 (IVRS) forum. • Continuous review and oversight of municipal water demand interventions. • Active engagement with municipalities through quarterly forums to assess progress. • Implementation of regional-level WDM strategies. A Project 1600 IVRS Water Demand Management Steering Committee (Project 1600 IVRS Forum) has been established to provide strategic support, guidance, and oversight on municipal efforts to reduce water demand. The IVRS forum meets quarterly to discuss individual customer performance against the set targets. In addition to the monitoring programme, Rand Water plans to hold one-on-one meetings with municipal customers to improve their understanding of the methodology used to assess water use efficiency. Water demand within Rand Water’s area of supply has shown a consistent upward trend in recent years, and the overall supply to municipalities has been on the increase. As illustrated in the graph below, municipalities have consistently exceeded Project 1600 annual allocation throughout the financial year. However, a noticeable decline in demand is observed from March to June when compared to the preceding months.

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Rand Water | Integrated Annual Report 2025