ChatGPT Water Usage: I Tried to Reproduce the 0.32 mL Claim
FACT CHECK · AI INFRASTRUCTURE · 18 SEPTEMBER 2026 I tried to reproduce the 0.32 mL ChatGPT water number. Here is what I found Q How much water does one ChatGPT query actually use? ZH The arithmetic checks out. The public methodology does not exist. The figure is consistent with counting only the water evaporated in data center cooling, which is the smaller half of the water story. Plausible under stated assumptions. Not verifiable. Not a constant. 0.32 mL Sam Altman. Boundary not stated. 0.26 mL Google median. Cooling only, formula published. 0.6 to 17 mL Independent range. Wider boundary. A figure has been circulating for over a year: one ChatGPT query uses about 0.32 millilitres of water, roughly one fi...