The Illusion of Scarcity vs. the Paradox of Plenty

Analysis

Deciphering the Mauritius Water Crisis through Hydrological Data and Governance Failures

By Riad Sultan

The small island nation of Mauritius presents a stark hydrological paradox. Classified by the World Bank as a “water-stressed” country and projected to fall into the “water-scarce” category, Mauritius suffers from chronic domestic supply disruptions, dry-season rationing, and low water pressure. In several regions, households receive running water for a mere two to three hours per day. The recent episodes show a disruption of water for days.

However, an analysis of the country’s hydrological balance shows that nature is not to blame for this scarcity. The Mauritian water crisis is fundamentally structural — driven by institutional delays, misaligned economic incentives, and systemic governance issues. The data clearly demonstrates that Mauritius does not face an absolute rainfall deficit (Sultan, 2020).

The Numbers behind the Crisis: Water Availability vs. Utilization

The proof of Mauritius’s artificial water crisis lies in the gap between total available water and actual water consumption.  Official statistics (for e.g., from 2015 through 2025) demonstrate that the island receives substantial annual precipitation yet utilizes only a tiny fraction of it for potable needs.  In 2025, total rainfall recorded across Mauritius reached 3,402 million cubic meters (Mm³). This was among the lowest over many years as annual precipitation remains significant even in drier years: 4,077 Mm³ in 2024, 4,742 Mm³ in 2023, and 5,252 Mm³ in 2018.

After deducting evapotranspiration (1,021 Mm³ in 2025), net total water available to the island — comprising surface runoff and groundwater recharge — stood at 2,381 Mm³ in 2025. In peak years, net available water reached 3,676 Mm³ (2018) and 3,319 Mm³ (2023).

Yet, the volume of water collected and utilized by the Central Water Authority (CWA) is minimal.  In 2025, total potable water used amounted to just 114.7 Mm³. Calculated as a percentage of total water available (precipitation minus evapotranspiration), potable water consumption represented a mere 4.8% in 2025. Across the 2015–2025 decade, this percentage has remained microscopic, fluctuating between 3.0% (2018) and 4.8% (2025).

Furthermore, the percentage of water collected by the CWA out of total available water was only 13.9% in 2025 (332 Mm³ collected out of 2,381 Mm³ available) and 7.6% in 2018. The remaining bulk — over 85% to 92% of available water — is lost as surface runoff (2,041 Mm³ in 2025) flowing unhindered into the Indian Ocean.

For the year 2025, total water consumption (domestic and non-treated agricultural) accounts for 39.8% of CWA’s storage (domestic water consumption accounts for 35% of this storage). The remaining 60.2% of storage is the so-called ‘non-accounted revenue water’, which include leakages.  These figures prove that the water crisis is driven not by a natural deficit of rain, but by severe limitations in capture, storage, and network management.

Socio-Economic Inequality and Climate Amplification

These governance challenges give rise to socio-economic disparities. Larger commercial operations (including garment factories, resorts, and agriculture) often rely on rainwater harvesting or private storage infrastructure, and affluent households routinely purchase private tanks and pumps. In contrast, lower-income households are disproportionately affected by uneven water rationing.

Climate change intensifies these vulnerabilities. Shifted rainfall patterns (rains starting late January) prolong dry periods, while intense torrential downpours occur over fewer days. Outdated drainage systems cannot absorb sudden surges, triggering deadly flash floods — such as the Port Louis floods — while rainwater washes uncollected into the ocean. Meanwhile, growing demand from population growth, tourism, and real estate development further strains the fragile system. Water storage and distribution has not kept pace of these climate dynamics it seems.

What Is Wrong? A Critique of Water Governance

How can a nation afford to lose 85% of its natural water supply while continuing to suffer from severe rationing? A diagnostic review of the Mauritian water sector tells a different story.

Mauritius has a volcanic topography and naturally channels precipitation from high-altitude catchments down to lower plains. This is an important asset that should simplify feed distribution through gravity forces. However, storage infrastructure has failed to capture seasonal peaks. Over 75% of annual rainfall arrives during the summer months (November to April), while the island faces severe dry-season shortages after two to three months of dry weather. Without sufficient reservoirs, billions of cubic meters of rainwater overflow directly into the sea.

However, capturing water is ineffective if distribution networks are broken. Aging distribution pipes suffer from frequent leaks, sudden breakdowns, and low pressure that allows dirty water to enter the system. With almost as 60.2% of non-accounted revenue water, cutting network losses could effectively double the water available for use.

On the question of pipe replacement vs. dam construction economics, fixing leaking pipelines is significantly more cost-effective than building multiple mega-dams when 50% to 55% of distributed water is lost as Non-Revenue Water.

Why are leaky pipes not replaced and new reservoirs not built? Is it an issue of financing? Without adequate capital, maintenance, pipe replacements, and infrastructure expansion cannot be undertaken. Only by reforming water economics and modernizing infrastructure can Mauritius transform its natural rainfall abundance into a reliable, 24-hour supply for all citizens. According to a study I conducted, Mauritian households are willing to pay an average 27% increase in their water bills for a reliable, 24/7 high-pressure supply. The demand exists, and the willingness to contribute is present¹.

The right perspective: the political economy of the water sector

Short-term priorities often take precedence over long-term asset management, resulting in a system where artificially low rates ultimately compromise service reliability. Rather than treating water as a long-term public asset requiring continuous stewardship, policymaking often balances visible short-term measures — such as water tank subsidies and free allocations — against less visible or politically sensitive structural reforms, including tariff adjustments, pipe maintenance, and systemic non-revenue water reduction.

Water Tanks and Free Water as Electoral Clientelism

Let’s consider the water tank scheme, which provides subsidized or free domestic water storage tanks and pumps. It has served and continue to serve as an effective tool for short-term pacification to the population. It does provide relief to the population. However, instead of fixing the Central Water Authority’s leaking distribution network to ensure 24/7 tap pressure, it seems that tank subsidies are used to offset public utility failures privately. From a political perspective, distributing a physical water tank or promising the first 6 m³ of water free of charge provides an immediate, tangible solution that voters can see and feel in their homes!

Pipe Replacement as Political Reward

While replacing decaying underground pipes is the most effective way to eliminate the 50%–55% Non-Revenue Water loss, it is constrained by politics. There are technical masterplans for pipe renewal across the island; yet actual execution requires ministerial approval to release funding. Funding allocations for pipe replacements can sometimes coincide with election cycles, reflecting short-term regional prioritization over systematic, long-term asset planning.

The “Invisible Project” Problem

But let’s face the blunt reality: replacing underground pipes may be politically unrewarding, especially if it is undertaken in an unprofessional manner. It disrupts road traffic, causes temporary economic inconvenience, and importantly, leads to utmost inconvenience if the authorities fail to communicate properly. There is thus the issue related to the capability to undertake such activities. One particular characteristic is that it remains completely invisible once buried underground. The population cannot “see” a new underground pipe, hence, there seems little electoral return on expensive piping overhauls compared to above-ground hand-outs.

Mega-Dams and Supply-Side Ribbon-Cutting

With capital infrastructure, dams (such as the Bagatelle or Midlands projects) serve as grand, highly visible monuments of government achievement. They provide high-profile “ribbon-cutting” photo opportunities prior to national elections. Very often, this creates an opportunity for a supply-side Illusion: announcing a new dam creates a public narrative that the government is actively “solving water scarcity” by capturing more rain. However, this ignores the facts that the work never starts and economic reality that above 50% of the water captured by new dams will simply leak out of broken pipes before ever reaching a consumer’s tap.

Political short-termism and rent seeking

At the root of this political dynamic is what economists call the Political Short-Termism under the Public Choice School. Constructing the dams or reservoirs is a long-term project which exceeds the lifespan of the political cycle of 4 to 5 years.  Water storage infrastructure can survive in the short term by covering only operating costs while neglecting capital maintenance and infrastructure, to the detriment of the population.  Successive governments defer pipe replacements and infrastructural upgrade, and adopt alternative solutions to win short-term political support, leaving future generations with a collapsing grid. Moreover, implementing sustainable reforms requires changing the whole institutional and financing framework of water storage and distribution to full-cost recovery levels — a decision that is politically painful and risks alienating voters.

Conclusion and Policy Imperatives

Mauritius faces a governance crisis rather than a physical water shortage. Utilizing under 5% of net available water while letting over 85% run off into the sea is systemic mismanagement.  To resolve this crisis, Mauritius must replace political populism with economic logic.

Relevant institutions need to come forward with time-bound plans to systematically replace decaying pipes and construct targeted reservoirs, together with their implementation and financing aspects. This also requires deploying digital technologies (flow mapping, predictive modelling) to manage ecological dynamics.

Finally, it is essential to secure a sustained revenue mechanism to fund capital investments, for example through water tariff reforms with revenues directed specifically to capital investments. When political expediency overrides economic logic — compounded by a lack of capacity and commitment — the future of the water sector remains bleak.

Riad Sultan

Reference Note: ¹ Sultan, R. (2020). Accounting for the non-market benefits of water supply improvements to ensure sustainability: The case of Mauritius. International Journal of Critical Accounting, 11(4), 299–317.

Mauritius Times ePaper Friday 16 October 2026