In Saudi Arabia, desalination is the primary source of water for major cities such as Riyadh, Jeddah, and Dammam, making the Kingdom the world’s largest producer of desalinated water. Rather than serving as a supplemental resource, desalinated seawater forms the mainstay of the municipal water supply. This dependence highlights the critical nature of desalination plants as vital infrastructure, where any disruption can have significant impacts on thousands, if not millions, of residents.

While the plants themselves are engineered for reliability, experts point to the coastal waters surrounding their intakes as a key vulnerability. These intake zones are susceptible to contamination from various sources, including oil spills from nearby shipping lanes, algal blooms, and discharges from adjacent facilities. Such contamination can reduce the plants’ output or necessitate temporary shutdowns, threatening water availability.

Currently, coastal water quality monitoring in the region relies on a combination of periodic sampling, laboratory testing, and an increasing use of automated real-time systems. However, these methods offer differing levels of visibility into environmental conditions. Laboratory samples provide data at discrete moments, offering a snapshot but missing fluctuations between tests. For instance, a monthly sample only captures conditions at a single point in time, while automated systems recording data every 15 minutes capture thousands of observations. This distinction is crucial, as harmful events such as algal blooms can rapidly emerge and dissipate between scheduled samples without detection, potentially leaving plants to operate below capacity unknowingly.

Efforts to safeguard drinking water supplies would benefit from expanding the use of continuous real-time monitoring near intake points. These systems can detect hydrocarbon presence and other contaminants almost instantaneously, sending alerts directly to operators. Early detection would provide valuable response time to close intakes, switch to alternative sources, or deploy containment measures before pollutants enter treatment facilities.

Maintaining accurate and reliable sensor data does require regular calibration and inspection. The harsh marine environment of the Gulf—with its high salinity and temperature extremes—poses ongoing challenges for equipment upkeep. Having trained personnel and spare parts readily available within the region can help ensure timely service and avoid prolonged outages.

In addition to immediate contamination risks, longer-term environmental changes present concerns. The Gulf is among the world’s warmest and saltiest marine environments, and climate trends indicate rising temperatures. Warmer waters hold less dissolved oxygen, exacerbating stress on marine ecosystems and potentially impacting water quality. However, inconsistent historical data across the region makes it difficult to establish clear baselines and track these evolving conditions with precision.

Traditionally, water security assessments focus on desalination capacity—measured by the number of plants and their daily production volumes. Yet, experts caution that capacity alone is insufficient. A comprehensive approach must also incorporate real-time awareness of water quality to enable proactive management and safeguard the supply that millions depend on.