Sector Study · Prepared for MEWA
منظومة المياه في المملكة — خريطة المسؤوليات المؤسسية
Four sources feed a five-step chain that returns water to its own beginning. This study sets out the strategy governing the sector, the entity accountable at each step, what each one actually does, how delivery is financed and procured, and where the resulting data is held.
Saudi Arabia runs one of the most engineered water systems in the world, and almost none of it is natural. Two published strategies govern it — the National Water Strategy 2030 set by MEWA, and the Saudi Water Authority’s own strategy for the sector it regulates. They agree on the direction: cut demand, cut losses, cut reliance on non-renewable groundwater, and replace it with desalination and reuse.
A sustainable water sector that develops and maintains financial resources, protects the environment, and provides a secure supply, high-quality services, and efficiency that contributes to economic and social development.
A globally distinguished model for sustainable management of water services and enabling innovation.
Mission — drive excellence in the water ecosystem through regulatory oversight and stewardship, sustainable water management, improved service quality, capability and economic enhancement, and innovation, while maintaining commitment to the phased responsibilities during the transformation process.
The strategy's programmes are not aspirations in the abstract. Four of them named specific institutional changes, and all four have since happened — which is why the sector map looks different from any pre-2018 description of it.
National supply-mix figures are routinely quoted as though the Kingdom has a single water system. It does not. Municipal supply runs overwhelmingly on desalinated seawater delivered through the transmission and distribution network. Agriculture runs overwhelmingly on groundwater, much of it non-renewable, abstracted at the field and never entering that network at all.
Any percentage quoted without saying which of the two it describes is close to meaningless. For an agricultural land evaluation the distinction is decisive: the desalination capacity that dominates the national headline is largely irrelevant to a hectare of farmland, whose realistic options are the aquifer beneath it, an allocation of treated effluent, or a place inside an irrigation command area.
Almost all of Saudi Arabia’s natural water is underground, and most of it is not being replaced. The distinction between the shallow renewable aquifers recharged by rainfall and the deep fossil systems charged in a wetter geological past is the single most important fact about the resource base — and it is what makes the desalination and reuse programmes necessary rather than merely prudent.
Saudi Arabia sits on the Upper Mega Aquifer System, described in the literature as one of the largest aquifer systems in the world.39 It is not a single body of water but a set of sandstone and karstified limestone aquifers, imperfectly connected to one another, with the Upper and Lower systems separated by the anhydrite aquitard of the Hith Formation.40
Agricultural land in Saudi Arabia sits above one of these aquifers, and which one it is determines almost everything the water assessment needs to know: the depth a well must reach, the salinity it will produce, whether the resource is being replenished at all, and whether abstraction there is politically and legally sustainable.
A well licence is a record of permission, not of yield. Where water levels are falling by metres a year, a licensed well may already be uneconomic or dry. The WF source assessment needs the aquifer beneath the cell, not only the well register above it.
Every origin of water is gathered into a single Sources step, each source set out in its own row. From there water moves through transport, distribution, collection and recovery, and treatment — and treated effluent returns to the sources as WT rather than leaving the system. Distribution carries two parallel channels, the municipal network and the irrigation network, because farmland and cities are reached by different operators. Accountability changes hands at defined physical points: the plant fence, the city gate, the customer meter, the sewer inlet, the treated-effluent outlet. Each handover is where one dataset stops and another starts.
A stakeholder list tells you who exists. It does not tell you where a number stops being one entity’s responsibility and becomes another’s. Water leaving a desalination plant is measured by the producer; the same water arriving at a city gate is measured again by the distributor, and the two figures rarely agree. The difference is transmission loss, and it belongs to neither party’s own reporting.
Closing the loop makes a second point that a linear chain hides. Treated effluent is not the end of the sector — it is one of its five sources, and the one growing fastest under a 70% reuse target. Whether it reaches a given location is decided by an allocation record held by SIO, not by the presence of a treatment plant nearby. A plant on the far side of the fence confers no water access without that record.
Total water demand stood at 15.98 billion m³ in 2020. Agriculture accounted for 67% of it, urban use for 3.6 billion m³ or 23%, and industry for 1.7 billion m³ or 10%.36 Other published series divide the total differently — a copula-based forecasting study puts the municipal sector at about 9% and industry at about 7%47 — so the shares below should be read as orders of magnitude from named sources rather than as a single reconciled account.
Saudi agricultural water use was not reduced by efficiency alone. It was reduced by prohibiting the crops that consumed most of it — which means crop choice in this country is constrained by policy as well as by climate and soil.
Fodder crops alone are reported to consume about 79% of the water used for agriculture in the Kingdom,46 and green fodder cultivation was prohibited with effect from 5 November 2018.44 Domestic wheat was subject to a phase-out decreed in 2007, then had support reintroduced from 2018 precisely because it is less water-intensive than alfalfa.45
The consequence for a land evaluation is direct. A crop that clears every biophysical threshold may still be prohibited, restricted or unsupported — and a suitability class that ignores this will recommend land for crops that cannot lawfully be grown on it. Policy status belongs in the crop register alongside the agronomic thresholds.
Municipal supply is where the desalination and transmission programme lands. It is served through NWC’s six regional clusters, and it is the demand that the per capita consumption target is written against. Urban demand grew at about 6% a year on average before the 2016 tariff reform, and at a declining rate of about 4% a year afterwards — the clearest evidence in the sector that price, not only awareness, moves consumption.36
Industrial water use is concentrated in petrochemical complexes, refineries, manufacturing and mining, particularly in the industrial cities of Jubail and Yanbu.47 These are served by a dedicated utility rather than by NWC: Marafiq, the Power and Water Utility Company for Jubail and Yanbu.58 Within Jubail Industrial City, industrial consumption has been reported at about 53% of the city’s total water use.59
Industrial and municipal water in Saudi Arabia is largely manufactured, and manufacturing it costs energy. The desalination industry has been reported to consume approximately 15% of the Kingdom’s produced crude oil,59 and the energy consumed by desalination has been put at more than six times that used by the industrial sector itself.36 This is why the cost and carbon targets in the strategy are inseparable from the water targets.
The Kingdom’s thirteen administrative regions were consolidated into six operating clusters under NWC between November 2020 and early 2022, each let to an international management, operation and maintenance consortium.16, 49 The cluster is the operating unit; the region remains the reporting unit. Any regional deliverable has to speak to both.
NWC announced a programme covering all thirteen administrative regions across the six sectors, with the following distribution.53
The Western Cluster comprises the Makkah region alone — Jeddah, Makkah and Taif — with a resident population of about 8.9 million, and it hosts around 3 million Hajj pilgrims and 10 million Umrah visitors a year.52 It also carries the largest share of the NWC investment programme, 353 projects worth SAR 38.96 billion.53
That matters for the reference deliverable. Makkah was chosen to validate the approach for the other twelve regions, but its water system is the least representative of the thirteen — highest demand volatility, heaviest infrastructure, and a seasonal peak no other region experiences. Methods that work there should transfer; assumptions calibrated on its numbers should not.
Whether treated effluent can irrigate a crop is a regulatory question before it is an agronomic one. The Law of Treated Sewage Water and its Reuse and its Executive Regulations define the treatment levels, the two irrigation classes and the contaminant limits that separate them.54 These are the national anchor for the water module’s quality parameters.
Biological treatment ending with precipitation and disinfection. The resulting water may be used for restricted irrigation only.54
Biological treatment ending with filtration and disinfection, or equivalent processes. The resulting water may be used for unrestricted irrigation, defined as the irrigation of all kinds of crops without exception.54
The limits below are the 2006 standards issued by the then Ministry of Water and Electricity, which replaced the 2003 municipal-affairs standards. They remain the reference set in the published compliance literature.55 Note that the issuing ministry no longer exists as such — its water functions sit with MEWA.
A Royal Order of 2000 requires that wastewater generated in the Kingdom undergo tertiary treatment without exception,10 which would in principle place all treated effluent in the unrestricted class. The published literature reports that implementation remains inconsistent across regions and sectors.11
So the mandate cannot be used as evidence of quality. The compliance record held by NCEC, not the regulation, is what establishes the irrigation class of a given effluent stream — and where that record is absent, the safe assumption is restricted rather than unrestricted.
Twenty-one entities, grouped by how close they sit to the water itself. Core entities own assets, run operations or hold regulatory power over the chain. Enablers supply the foundational data, the money, the standards or the land-use permissions the chain runs on. Select a card for the full mandate, activity list and data holdings.
The same entity plays different roles at different stages, and several play more than one role at the same stage. Reading down a column shows an entity's true span; reading across a row shows how many separate accountabilities a single stage carries.
Custody here means the entity that produces, collects or maintains the dataset in the course of its own mandate. It is not a statement of exclusive legal ownership; it identifies who to ask, and who is answerable for the figure.
KSA_Water_Assessment_Data.xlsx and added rather than inferred.Since 2018 the Kingdom has shifted from building and operating water assets directly to procuring them from private developers under long-term offtake agreements. Five standard project types carry that programme, each with its own contract model and its own procuring body. Understanding them matters for data access: for an independent plant, the operating record sits with a private operator and reaches government through the offtaker.
Wholly owned by the Ministry of Finance, SWPC tenders projects and then buys their output under long-term agreements. It is the primary purchaser of water from both public and private producers, which makes it the single point where contracted capacity across the whole sector is recorded.
MEWA and SWA oversee the sector’s financial sustainability through the Water Balancing Account, a central mechanism intended to match sector costs against sector revenues. Its financial and operational backbone is SWPC, under the Ministry of Finance.
Collected wastewater is projected to reach roughly 14.1 million m³/day by 2030, against a required treatment capacity of about 14.8 million m³/day once buffer is allowed. SWPC's own independent plants currently account for around 1.86 million m³/day, rising to roughly 3.21 million after planned expansions and new tenders.
The arithmetic is worth stating plainly: the independent programme is a minority of the required capacity, not the whole of it. The balance sits with NWC's existing estate and with the kingdom-wide small sewage treatment plant programme — 123 plants across seven clusters. For an agricultural reuse assessment, most treated effluent will come from plants that are not in the SWPC portfolio at all.
Founding instruments and official entity sites first; sector guidance and peer-reviewed literature where an operational figure or a target is cited. Retrieved September 2026.