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SESK: Stuff Everyone Should Know · sesk.info/pilot-water-per-day

To help prevent dehydration, how much water does the FAA suggest drinking every 24 hours?

Two to four quarts, as a general guide.

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  1. Two to four quarts ✔
  2. One cup
  3. Two gallons

Why: The PHAK suggests two to four quarts of water every 24 hours, noting that each person is different. The common eight glasses a day guide equals about two quarts.

Huh, didn't know that: Eight 8-ounce glasses add up to 64 ounces, which is exactly two quarts.

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Why don't pilots ever get thirsty for long? They know where all the fueling stations are.
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References

Answer: Two to four quarts. The PHAK suggests two to four quarts of water every 24 hours, noting that each person is different. The common eight glasses a day guide equals about two quarts.

  1. PHAK FAA-H-8083-25C Chapter 17, Aeromedical Factors www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/phak/19_phak_ch17.pdf
    To help prevent dehydration, drink two to four quarts of water every 24 hours.
    Checked 2026-10-09.

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