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Envirogen Group

Total Water Treatment and Process Filtration Solutions

DATA CENTRE WATER PLANNING: WHAT NEEDS TO BE RESOLVED BEFORE KEY DESIGN DECISIONS ARE LOCKED IN

Data centre water planning has long been a core design consideration for major projects. What is changing is how early the site-wide water strategy is coming under scrutiny within the wider development process.

In Scotland, new rules introduced in September 2026 mean applications for new data centres exceeding 50MW power capacity require an Environmental Impact Assessment (EIA). In Texas, authorities are also asking more detailed questions about projected water demand, supply sources, reuse and cooling technology.

Across Europe, the picture is also becoming more structured. The EU reporting framework already includes total water input and Water Usage Effectiveness (WUE), and on 21 September 2026 the European Commission proposed a common EU rating scheme to make data-centre energy and water use more transparent. Norway is taking a different resource-efficiency route, requiring cost-benefit analysis of excess-heat utilisation for new data centres above 2MW.

These are different regulatory and policy routes, but together they reflect a wider shift. As AI-driven development accelerates globally, data centre water demand, cooling architecture, source availability, reuse and resilience are receiving greater scrutiny earlier in planning, alongside mainstream reporting and community debate.

The question is not whether water matters, but whether it is understood early enough to influence key design decisions while meaningful options remain open.

WATER DECISIONS GET HARDER TO CHANGE LATER

Power capacity, land, connectivity and programme naturally dominate early discussions for major data centre developments. Water is equally site-specific. Demand and treatment requirements can be shaped by:

  • Geographical location, climate and local water availability.
  • IT load and cooling architecture.
  • Source-water availability and quality.
  • Operating model and resilience requirements.

Headline consumption figures are a poor substitute for a project-specific water balance. At the site-planning and design-engineering stage, the water position needs to be clear enough to inform:

  • Treatment and reuse routes.
  • Space, utilities and interfaces with wider MEP systems.
  • Discharge and contingency arrangements.
  • Whole-life cost, maintenance and future expansion.

MEP consultants, water utilities and, where relevant, local authorities may all need to contribute. Resolving these issues early helps avoid costly redesign, rework and programme disruption as the wider infrastructure design progresses.

SCOTLAND BRINGS WATER EXPLICITLY INTO THE PLANNING DISCUSSION

Since September 2026, Scotland has required an Environmental Impact Assessment (EIA) for applications for new data centres exceeding 50 MW power capacity. The Scottish Government Chief Planner letter and EIA Direction reference AI-related water consumption, potential impacts on water resources and the role closed-loop cooling can play in significantly reducing the amount of water required where water is used for cooling.

The Scottish Government also emphasises identifying EIA at the earliest possible stage, when mitigation can be integrated into the design. This does not prescribe a single cooling or water solution; it reinforces the value of establishing the water position before key design decisions become harder or more expensive to change.

US MARKETS ARE ASKING SIMILAR PROJECT QUESTIONS

In Texas, an August 2026 data centre audit directive instructed the Public Utility Commission of Texas and Electric Reliability Council of Texas (ERCOT) to obtain from projects progressing through ERCOT’s interconnection process information including projected annual and peak water consumption, anticipated water sources and proposed cooling technology. A September follow-up direction told the Texas Water Development Board to enforce existing water-use reporting requirements and coordinate with ERCOT on additional data-centre water information.

Virginia is taking a different route. From January 2027, amended water-withdrawal reporting requirements require certain water providers to report potable and reclaimed water supplied to data centres with Department of Environmental Quality air permits. Separate 2026 budget provisions also place water-efficiency requirements on new data centres in defined Cooling Water Scarcity Areas and the Eastern Virginia Groundwater Management Area.

The regulatory routes differ, but both point to the same practical shift. Water is being considered earlier in data centre development, with greater attention on how much may be needed, where it will come from, how cooling choices affect demand, and what role reuse or more water-efficient approaches could play.

WHAT SHOULD DATA CENTRE WATER PLANNING COVER?

The same early-planning principle appears in the Alliance for Water Efficiency’s 2026 Data Center Primer for Water Service Providers, developed to help water providers engage earlier in data-centre planning and design. It highlights missed opportunities for efficiency and reuse when water providers are brought in too late. A practical early-stage checklist should establish the site-wide water position across:

  • Expected average and peak water demand;
  • Cooling architecture, including liquid-cooling interfaces, and associated water-quality and filtration requirements;
  • Mains, groundwater, reclaimed water, surface water or other technically suitable source-water options, including whether rainwater harvesting or specialist surface-water treatment is appropriate;
  • Opportunities for data centre water reuse, recovery and recycling, including direct nanofiltration (dNF) where appropriate;
  • Opportunities to reduce feedwater demand and wastewater volumes through high-recovery water treatment or, where justified, Zero Liquid Discharge (ZLD);
  • Discharge requirements, local water constraints and permitting considerations;
  • Source-water variability and whether pilot plant trials are needed to validate a proposed treatment or reuse route;
  • How water use, quality and treatment performance will be measured and monitored, including Water Usage Effectiveness (WUE) where relevant;
  • Contingency supply and resilience during drought, outage or source changes; and
  • Future expansion and lifecycle cost, not simply day-one demand.

These considerations are interconnected. An alternative water source may reduce reliance on potable supplies but introduce different treatment requirements. Higher-recovery strategies can reduce feedwater demand or wastewater volumes but may change energy use, maintenance, residuals handling or process complexity. Cooling architecture can change both water demand and the quality required. There is no single water-use profile or treatment strategy that fits every data centre. That matters even more when AI infrastructure is being delivered at pace, because late changes can affect programme, cost and capacity.

WHY SPECIALIST WATER EXPERTISE MATTERS EARLY

For MEP and architectural consultants, water is one specialist discipline among many. Detailed expertise in source-water chemistry, treatment, reuse, discharge and lifecycle performance may not sit in-house on every project. Engaging experienced water specialists early in the design process can help test assumptions, define realistic treatment and reuse routes, coordinate interfaces with cooling and wider MEP systems, and reduce the risk of late redesign, mis-specified treatment or avoidable capacity constraints.

Envirogen supports major data-centre projects internationally through specialist design-build and MEP channels, delivering data centre water treatment and process filtration scopes. Its project delivery and engineering teams also draw on complex infrastructure, manufacturing and healthcare projects where water quality, reuse, modular delivery and commissioning are critical. That cross-sector learning can strengthen data-centre delivery without assuming that different sites or cooling architectures need the same solution.

Where appropriate, Envirogen’s support can extend beyond process design into prefabricated or turnkey package delivery, mechanical installation, commissioning and handover, maintaining continuity through construction.

PLAN FOR EXPANSION, NOT JUST DAY-ONE DEMAND

That collaboration is most valuable while the wider infrastructure strategy is still being shaped. The aim is not to specify the most complex treatment or reuse strategy available, but to understand the options and trade-offs early enough for water requirements to influence key design decisions while meaningful options remain open.

For a deeper look at data centre water resilience, including liquid cooling, reuse and recovery, read The Next Constraint on AI Infrastructure – Water?. For treatment technologies and data centre water reuse options, see Sustainable Data Centre Water Treatment. For an explanation of the EU’s proposed WUE classes and how whole-site design decisions affect water-efficiency performance, read Data Centre Water Efficiency: What the EU’s Proposed WUE Rating Means in Practice.

As scrutiny around water demand, source availability, cooling and reuse increases, data centre water planning needs to sit alongside other critical infrastructure decisions from the outset. The objective is simple. Avoid allowing water to become a constraint only after the wider design has already been locked in.

SOURCES / FURTHER READING

DISCUSS YOUR DATA CENTRE WATER REQUIREMENTS

If you are planning a new data centre or expansion, discuss your data centre water requirements with Envirogen. 

An early conversation can help identify which water-demand, source, reuse, treatment and resilience issues need further assessment before key design decisions are locked in.

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