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Why Is China Adding 1.5-Million-m³/Day of Desalination Capacity by 2030? Analysis by Shanghai ChiMay
The Scale of China’s Water Challenge
China’s coastal economic belt—stretching from Liaoning in the northeast to Guangdong in the south—generates roughly 60% of the nation’s GDP. Yet many of these provinces face some of the most acute water scarcity pressure in the country. China’s per-capita freshwater resources sit at only about one-quarter of the world average, and the northern coastal provinces fall well below even that national figure.
The situation is structural, not cyclical. Rapid industrialization, urbanization, and agricultural demand have pushed groundwater tables in provinces like Shandong, Hebei, and Tianjin to critically low levels, and land subsidence from over-extraction remains a live concern across the North China Plain. Without alternative supply, the cost of water scarcity in these regions keeps climbing year by year.
The Policy Response: The Seawater Desalination Industry Development Action Plan
On July 16, 2026, three ministries—the National Development and Reform Commission, the Ministry of Natural Resources, and the Ministry of Water Resources—jointly issued the Seawater Desalination Industry Development Action Plan (《海水淡化产业发展行动方案》), implementing the “15th Five-Year Plan” directive to scale up desalination and other emerging marine industries. The plan deploys seven major actions:
- Urban water security: strengthening coastal city resilience through diversified water sourcing
- Island and shipboard supply: expanding reliable freshwater for remote island communities and maritime vessels
- Industrial utilization: scaling desalinated water use in water-intensive coastal industries (power generation, petrochemicals, steel)
- Technological innovation: investing in next-generation membranes, energy recovery, and intelligent monitoring
- Supply chain coordination: strengthening domestic manufacturing of membranes, pumps, and instruments
- Low-carbon transition: coupling desalination with renewable energy to reduce carbon footprint
- International cooperation: exporting Chinese desalination technology and standards
The headline targets: total national desalination capacity of 4.5 million m³/day or more by 2030, with at least 1.5 million m³/day of that being new build. For reference, the Ministry of Natural Resources’ 2024 National Seawater Utilization Report puts installed capacity at 2.86 million m³/day across 158 plants at the end of 2024—the latest officially published figure—so the plan calls for roughly a 1.6× expansion in about six years.
The 1.5-million-m³/day increment translates to approximately 300 new large-scale SWRO trains (assuming 5,000 m³/day per train) or equivalent expansion of existing facilities.
Domestic RO Membrane Breakthroughs Accelerate Deployment
One of the most significant enablers of this expansion is the maturation of China’s domestic RO membrane industry. By 2026, Chinese membrane manufacturers have closed most of the performance gap with international brands at a materially lower price point. Typical figures cited for domestic seawater RO elements include:
- Salt rejection: >99.7% for standard seawater membranes
- Flux stability: consistent performance over a 5–7 year element life
- Fouling resistance: newer thin-film nanocomposite (TFN) coatings with improved organic-fouling resistance
Market researchers peg the global TFN RO membrane market at roughly USD 132 million in 2025, growing at about 5.7% CAGR toward USD 194 million by 2034, with Chinese manufacturers capturing an increasing share. This domestic supply chain maturity means the cost barrier to desalination deployment has fallen dramatically, making the government’s targets technically and economically feasible.
What This Means for Water Quality Instrumentation
Every new desalination train requires a comprehensive suite of water quality monitoring instruments. For a typical 5,000 m³/day SWRO train, the instrumentation package includes:
| Parameter | Sensor Type | Quantity per Train | Purpose |
|---|---|---|---|
| Conductivity/Salinity | In-line conductivity meter | 4–6 | Intake, each RO stage permeate, brine, product |
| pH | In-line pH electrode | 3–4 | Pretreatment, post-treatment, discharge |
| Turbidity | Online turbidity tester | 2–3 | Intake, post-filtration, product |
| Dissolved oxygen | DO transmitter | 1–2 | Product water storage |
| Residual chlorine | Chlorine transmitter | 1–2 | Post-treatment disinfection |
| Flow rate | Flow meter | 3–5 | Feed, permeate, brine, recirculation |
Multiplying this by 300+ new trains over the next four years yields an instrumentation demand worth hundreds of millions of dollars. Shanghai ChiMay, as a domestic manufacturer of water quality analyzers, is positioned to supply a significant share of this market.
Comparison: China’s Approach vs. Global Desalination Trends
| Metric | China (2026 Action Plan) | Global Context |
|---|---|---|
| New capacity target (to 2030) | +1.5 million m³/day | Varies by region |
| Domestic membrane supply | Majority of new SWRO projects now specify domestic membranes | Varies by country |
| Legal status of desalinated water | Supplementary water source under the revised Water Supply Regulation (since June 2026) | Often classified as supplementary |
| Energy recovery | >95%-efficient pressure exchangers now standard on modern SWRO trains | Standard practice |
China’s approach is distinguished by the combination of top-down policy mandates, domestic supply chain development, and explicit legal recognition of desalinated water in urban supply planning.
Legal Status: From Emergency Backup to Encouraged Supply Source
China’s revised Water Supply Regulation (《供水条例》, State Council Order No. 831, effective June 1, 2026, replacing the former Urban Water Supply Regulation) addresses desalination directly in Article 10: coastal water-scarce regions and islands are encouraged to adopt desalinated seawater as a supplementary water source (补充水源). That is a step short of classifying desalination as a conventional source—but it gives desalinated water an explicit legal footing in urban supply planning for the first time, which is exactly what large-scale project financing has been waiting for.
Challenges Ahead
Despite the ambitious targets, several challenges remain:
- Energy costs: Even with energy recovery, SWRO remains energy-intensive at 2.5–4.0 kWh/m³. Integration with renewable energy sources is essential for long-term sustainability.
- Environmental impact: Brine discharge affects marine ecosystems. Monitoring and mitigation—including real-time salinity and temperature monitoring at outfalls—will become increasingly important.
- Skilled workforce: Operating and maintaining hundreds of new desalination plants requires a trained workforce. Training programs for plant operators and instrumentation technicians are expanding but need acceleration.
Conclusion
China’s decision to add 1.5 million m³/day of desalination capacity reflects both an urgent water security imperative and a strategic industrial policy. For water quality instrumentation manufacturers like Shanghai ChiMay, this expansion represents a multi-year demand wave that will require reliable, cost-effective, and intelligent monitoring solutions across every treatment stage.
All product references are to product categories only. Shanghai ChiMay does not publish specific model numbers in public-facing content.
