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Does each AI question use a bottle of water?

Not by the one measurement we have. Google estimates that a median Gemini text prompt uses about 0.26 mL of water, roughly five drops. That is a company estimate for one product and has not been checked by an outside party.

Checked on Oct 2, 2026

Short answer

ReportedNot supported by the one measurement we have

0.26 mL

estimated water per median Gemini text prompt

The evidence

Google says its estimate for the median Gemini Apps text prompt is 0.24 Wh of energy, 0.03 g of carbon dioxide equivalent and 0.26 mL of water, which it describes as “about five drops.”1 Google also says these figures are “substantially lower than many public estimates.”1

A 500 mL bottle (our assumption of a typical size) would hold about 1,900 of those prompts. That division is our own arithmetic, not Google’s.

How Google got the water number. Google says it estimated water per prompt from the energy per prompt, using its 2024 average water usage effectiveness across its data centers.1 It is a point-in-time analysis based on May 2025 data, and Google says the findings do not represent the impact of all Gemini text prompts and are not a prediction of future performance.1

The catch. Google states that the data and claims have not been verified by an independent third party.1 That is why this page is labeled Reported, not Confirmed: the number is real and official, but it is the company’s own.

What we don’t know

  • No independent measurement of the water used per question, for Gemini or for any other chatbot, is cited here. We found the Google estimate; we did not find an outside check of it.
  • The figure is for a median text prompt on one product. This page has no sourced number for other chatbots or for heavier tasks such as images, video or very long documents.
  • Google’s method estimates water from energy using a fleet-wide average of its data centers.
  • Where a particular data center gets its water, and how much it affects a local supply, is a separate question. See Is data-center water use just cooling?
About the label. Reported means the source is real and official, but the claim is the source’s own and has not been independently checked. Our own arithmetic and opinions are marked as ours. Found a mistake? mike@ohmyai.ai. The short versions of all eight myths are on Myths vs Facts.

Sources for this page

  1. Measuring the environmental impact of AI inference. Google Cloud Blog.Published Aug 21, 2025 · checked Oct 2, 2026