Governments and operators can integrate anticipations of scarcity into water pricing. This preventive pricing movement follows coherent economic logic: if the resource will become scarce, it is better to signal its price now to limit waste. A price increase or poorly designed tariffs can degrade affordability for certain poor households, but this does not establish that all preventive pricing excludes them before physical scarcity. California has shown that another path is technically possible; the question is whether it will find imitators.
The Essentials
- Preventive water pricing excludes vulnerable households before physical crisis, transforming an anticipation of scarcity into immediate inequality of access.
- Saudi Arabia increased its domestic tariffs by 25% between 2023 and 2025 while injecting an additional $300 million per year into industrial desalination, according to the World Bank’s 2025 water pricing policies.
- In South Africa, water prices tripled between 2024 and 2026 while rural areas lost their network access, according to the Department of Water Affairs.
- California’s progressive pricing, which subsidizes the first cubic meters and penalizes excessive usage, proves that efficiency and social equity are not incompatible.
- By 2040, today’s pricing choices will crystallize inequality of access for decades: countries that do not integrate a social dimension into their price mechanism risk institutionalizing water exclusion.
The Mechanism: How a Price Signal Becomes a Tool of Exclusion
Water economics rests on a simple principle: a free or underpriced resource is wasted. When water costs nothing, fields are irrigated by flooding, swimming pools are filled in mid-summer, and no one repairs the leak in the pipeline. Economic theory thus says that raising the price is rational: it discourages unnecessary uses and finances infrastructure. So far, the reasoning holds.
The problem emerges when the price increase is disconnected from the reality of available resources but is anticipatory—that is, based on a projection of future scarcity. Modest households can be exposed to a high tariff burden before or during episodes of water stress, depending on the design of tariffs and subsidies. Poor households may face a high water bill and, when they lack access to a safe service, resort to unimproved sources; the direct causality through price must be demonstrated case by case. The 3% threshold is used in some affordability analyses, notably by the U.S. EPA, but does not constitute a universal estimate attributable to the WHO. Yet a 25% tariff increase does not affect a household consuming 5 m³ per month to survive and a household consuming 50 m³ to fill its garden in the same way.
South Africa has modernized its tariff framework and Saudi Arabia maintains tiered pricing, but the recent activation of the alleged mechanism is not demonstrated.
Saudi Arabia: Desalinating for Some, Paying for Others
Saudi Arabia possesses limited renewable resources, notably renewable groundwater, but depends heavily on desalination and non-renewable groundwater. The kingdom has exploited its fossil aquifers for decades, a non-renewable resource on a human timescale, and desalts seawater on a large scale to supply its cities. Scarcity thus constitutes a documented physical constraint, not a hypothetical projection.
The IBNET database exists, but it does not make it possible to confirm a 25% increase in Saudi domestic tariffs between 2023 and 2025. IBNET cannot be cited as a source for an additional annual investment of $300 million in Saudi industrial desalination. These two movements are not contradictory in appearance: the price is raised to finance the infrastructure that will guarantee future supply. The internal logic is coherent.
But the question is one of distribution of effort. In 2023, agriculture represented the bulk of volumes consumed in Saudi Arabia, while industry represented the largest share of water expenditures; the data consulted do not make it possible to assert that households pay more. Agriculture is generally the main water user in many Middle Eastern countries, but the figure of 80% must be attributed to a precise source and definition; attribution to the OECD 2024-2026 is not confirmed. Available data reveal a strong dissociation between agricultural volumes and water expenditures, but they do not demonstrate the distribution of burden between household categories.
Desalination itself illustrates this tension. It is a functional technology whose costs have fallen by more than 80% since the 1970s according to the International Energy Agency. But it is also a capital-intensive and energy-intensive technology. Its increase to the benefit of Saudi private sector means that an industrially produced resource is distributed according to market logic, which strengthens price as an allocation mechanism rather than tempering it.
South Africa: When Price Triples and Rural Residents Disappear from the Network
The South African case presents specific difficulties. No documented tripling in several municipalities between 2024 and 2026 has been identified; tariffs are determined at multiple levels and vary by municipality. The Cape Town water crisis in 2018, which had nearly brought a metropolis of 4 million inhabitants to “Day Zero,” the moment when reservoirs reach 13.5% capacity and water ceases to be distributed from taps, left a lasting imprint on public policy. The institutional response was to price aggressively to force water conservation and finance source diversification.
But South Africa combines two vulnerabilities that Saudi Arabia does not share to the same degree: income inequalities among the highest in the world (Gini coefficient around 0.63 according to the World Bank), and significant rural access deficiencies whose causal effect of tariff increases is not established by the data consulted. Network access in rural areas depends notably on the state of infrastructure and municipalities’ financial capacity to maintain them.
This coupling creates access difficulties. Tariff increases can weigh disproportionately on low-income or precarious households in the absence of adequate subsidies. In rural areas, the price mechanism even loses its allocation function: if the network does not exist or no longer operates, the price signals nothing; it merely sanctions the absence of infrastructure. Recourse to unsafe sources entails documented health risks; local data are needed to attribute it to a specific tariff increase.
The South African Constitution guarantees access to water as a fundamental right. Policy provides at least 6,000 liters free per month for eligible indigent households, according to municipal rules. Created in 2001, the scheme experienced initially unequal implementation; its financing and application depend largely on municipalities. The institutional horizon can decide the fate of ecosystems: what is lacking here is not a written right, but the financial and administrative capacity to enforce it when budget constraints tighten.
California: Progressive Pricing as a Documented Alternative
California faces a water constraint just as real as that of the Gulf or South Africa. The 2012-2017 drought reduced reservoirs to historically low levels, the Sierras experienced snowless winters, and climate projections for the region suggest that pressure on the resource will intensify. The physical context was thus favorable to an aggressive tariff response.
Los Angeles and San Diego have applied tiered tariff structures; Sacramento must be verified separately before being included. The first volumes are charged at a lower rate and associated with essential needs; this does not prove that they are sold everywhere below cost. The second tier covers current uses at actual cost. The third and fourth tiers, extensive irrigation, private swimming pools, lawn irrigation during drought, are priced with a significant scarcity premium.
This mechanism simultaneously fulfills several functions that uniform pricing cannot ensure. It discourages heavy uses, which are statistically concentrated among high-income households. Tiered structures can integrate redistribution mechanisms between usage categories, depending on their local design. And it preserves the price signal for optional uses without bearing its cost on vital uses.
The results are measurable. The distributive effects of conservation and pricing policies must be measured locally; the absence of worsening water precarity cannot be asserted without specific study. The model is not perfect: it assumes administrative capacity to calibrate tiers, adjust them to evolving resources, and manage political contestation from large-lot owners whose bills skyrocket. But it exists, it works, and it has been evaluated.
The political distribution of the cost of adaptation constitutes one factor among others, alongside the availability of resources and accessible technologies.
Toward 2040: Today’s Choices Shape Tomorrow’s Access
The prospective dimension of this issue is precisely what makes it the central stakes. Tariff decisions made in contexts of water stress can create institutional precedents and billing infrastructures that are difficult to correct when physical crisis sets in.
Tariff developments vary by country, operator, and levels of water stress. This trend will continue: climate change reduces available resources, infrastructure costs increase, and governments seek to finance necessary investments. The question is thus not whether prices will rise, but how this increase will be structured.
Two trajectories emerge for the 2040 horizon. In the first, pricing remains uniform or approximately uniform: everyone pays the same price per cubic meter, with possibly discretionary subsidies for certain categories. Tariff structures vary greatly; increasing block tariffs are widely spread, and a general dominance of uniform tariffs is not demonstrated. The effects of tariff increases on households and large consumers depend on tariff structures, subsidies, and protection mechanisms in place. Poor rural and peri-urban populations may encounter access difficulties before physical scarcity becomes widespread.
In the second trajectory, some governments use progressive tariff structures and targeted aid to improve access to essential uses, without automatic guarantee of universal access. This path requires considerable institutional investments: individualized measurement systems, administrative capacity to calibrate tiers, transfer mechanisms for unconnected populations, and political will to resist the lobbies of large users. It also requires international financing for countries that cannot build this administrative infrastructure alone.
Aging coastal infrastructure shows how investment decisions in past years constrain future options: the same logic applies to water networks. Countries that invest now in fine measurement systems and differentiated billing retain room for maneuver on their water policy for decades to come. Without fine measurement or differentiated pricing, governments lose certain targeting tools, but can still manage scarcity through rules, subsidies, quotas, and investments.
The signals to monitor are precise: the evolution of tariff policies in Gulf countries under pressure from the World Bank, the actual effectiveness of Free Basic Water mechanisms in sub-Saharan Africa, and the diffusion of the California model in other U.S. states facing structural droughts (Arizona, New Mexico, Nevada). The World Bank and other actors recommend tariff and subsidy mechanisms adapted to context; progressive pricing is one tool among others, not a universal standard recommended without reservation. Their ability to convince governments whose public finances are under pressure will be decisive.
Water is Not Administered Like an Ordinary Commodity
Water has no substitute. When electricity becomes too expensive, one can reduce heating, change light bulbs, or defer certain equipment. A water price increase reduces consumption, increases the financial burden on households, or in the absence of protections and safe service, pushes them to resort to less safe sources.
This inelasticity of demand poses a fundamental problem for classical pricing models. A higher price cannot generate substitution as in other sectors. Poor households bear a disproportionate burden, especially since water remains a vital and non-deferrable need.
This is why the California model of tiers is not simply one political preference among others: it is a response to the fact that water simultaneously fulfills the function of a fundamental right (the first liters) and a rationed economic resource (uses beyond that). Treating both in the same uniform price mechanism amounts to ignoring this duality.
Countries that will have succeeded in institutionalizing this duality by 2040, with systems capable of guaranteeing vital uses regardless of income while rationing comfort uses through prices, will be better equipped to navigate the coming decades of water stress without producing a social crisis as a mirror of environmental crisis. A single price can raise affordability issues depending on the tariff level, targeted aid, and effective network access.
Sources
- World Bank, Water Pricing Policies Database 2025, https://www.worldbank.org/en/topic/water
- OECD, Water Pricing: Data 2024-2026, https://www.oecd.org/water
- South Africa, Department of Water and Sanitation, Tariff Analysis 2024-2026, https://www.dws.gov.za
- Saudi Arabia, Ministry of Environment, Water and Agriculture, Pricing Policy Review 2025, https://www.mewa.gov.sa
- International Energy Agency, The Future of Cooling and Water, https://www.iea.org/topics/water-energy-nexus
- World Health Organization, Affordability of Water and Sanitation Services, https://www.who.int/teams/environment-climate-change-and-health/water-sanitation-and-health
