AI Uses Less Water Than the Public Thinks

Quantifying the controversy over water use by AI data centers in California leads to a conclusion that the actual scale is much smaller than the concern suggests.

• California has about 15 million square feet of data centers, and assuming all of them run continuously on evaporative cooling, they could evaporate 32,000-290,000 acre-ft of water per year.
• Comparing multiple AI estimates, the narrow range supported jointly by four estimates converged to about 20,000 acre-ft/year.
• This figure corresponds to 0.055% of California's annual human water use of about 40 million acre-ft.
• Even applying the broad range, the share is around 0.08-0.7%, which is small compared to the state's total water demand.

The piece points out that AI companies and facilities do not sufficiently disclose their energy and water use, which skews the discussion toward speculation, but argues that in regions with relatively well-established water infrastructure like California, AI data center water use is not severe enough to warrant panic.

However, it notes the impact is not entirely absent, concluding that water issues are ultimately a regionally varying problem. It therefore argues that policy discussions need better technical grounding and honest quantitative estimates rather than exaggerated perceptions.