Article Masthead
- Category: Policy & Regulation
- Topic: Data Center Water Permitting
- Region: North America
- Signal Type: Executive Policy Signal
- Published Date: 2026-09-09
- Original Source Date: 2026-09-08
01 What Happened
Massachusetts Governor Maura Healey signed Executive Order 658 on September 8, establishing a new state permitting framework for large data centers and moving water-resource questions earlier in project development.
The order applies to covered data centers with peak electric demand above 25 MW and conditions state permitting on conformance with the administration’s data-center development framework and submission of a community benefits agreement aligned with state standards.
The framework is not limited to electricity. State agencies are directed to address water quantity, water quality, wastewater, stormwater and related infrastructure alongside energy, air quality, noise and community impacts. The administration has stated that projects should be located where sufficient water supply and wastewater capacity exist, should protect existing users, and should use water-efficient cooling and reuse where feasible.
Executive Order 658 does not create a statewide ban on data centers. It creates a permitting gate. Large projects must demonstrate that they meet the state framework before agencies advance permits.
The water significance is that supply and discharge questions are being moved from late-stage engineering details into early-stage site feasibility. A proposed data center may now need to demonstrate not only that a cooling design is technically workable, but that local water availability, wastewater capacity and infrastructure impacts are acceptable before the project can move through the state permitting process.
02 Key Takeaways
01 Executive Order 658 applies to large data centers above a 25 MW peak-demand threshold and adds a new permitting gate.
02 Water availability, wastewater capacity, stormwater and water-resource protection are explicitly part of the framework.
03 The trend moves data-center water planning upstream into site selection, community agreements and early permitting.
03 Why It Matters
Data-center water questions are often addressed too late. A site is selected, power strategy advances and buildings are designed before utilities fully assess whether potable supply, reclaimed water, sewer capacity and discharge chemistry can support the facility.
That sequence is becoming harder to defend as AI infrastructure grows. Cooling systems can impose large and highly seasonal water demands. Wastewater may include cooling-tower blowdown, water-treatment residuals and commissioning flows. Sewer capacity may be adequate hydraulically but unsuitable for a particular discharge chemistry. Reclaimed-water supply may exist on paper but lack reliable seasonal volume or the treatment quality required by the cooling system.
By embedding water considerations in permitting, Massachusetts is effectively treating water capacity as a site constraint rather than a utility service that can always be added later.
This does not mean every large data center will be forced to use recycled water or waterless cooling. But developers will increasingly need to document why the selected water architecture is compatible with local resource conditions and why the project will not shift water risk onto existing users.
04 ATLAS Engineering View
From an ATLAS engineering perspective, the most useful implementation tool would be a standardized pre-permit water balance.
Before a site advances, developers should quantify annual and peak-day make-up demand, cooling-system cycles of concentration, blowdown, treatment losses, sanitary flows, commissioning water, stormwater interactions and any reclaimed-water contribution. Those numbers should be tested against utility capacity under normal and drought conditions.
The second requirement should be water-quality compatibility. Reclaimed or impaired water may reduce potable demand, but higher hardness, silica, chloride, organics or biological activity can change cooling-tower chemistry, corrosion risk and pretreatment requirements. “Use reclaimed water” is not an engineering design until source quality and treatment are defined.
The third issue is wastewater capacity. A sewer may have hydraulic capacity while the receiving POTW lacks margin for a concentrated industrial stream. Pretreatment compatibility therefore needs to be evaluated before final equipment selection.
The broader trend is significant: data-center permitting is evolving from a narrow land-use and power question into an integrated infrastructure test.