Hydration Beyond Water: Electrolytes on Long Days
29 CFR 1926.51 · This talk in Spanish
Why it matters
On a long hot shift you lose a lot of sweat, and sweat is not just water: workers lose salt and other electrolytes when they sweat. Losing a lot of electrolytes can cause muscle cramps, and water cannot replace them. OSHA requires drinking water on every job, and for jobs over two hours in the heat it says to also provide electrolyte drinks. Today: what to drink, when, and the warning signs.
Hazards
- ⚠ Dehydration degrading strength, focus, and heat tolerance
- ⚠ Electrolyte depletion: cramps, headache, nausea despite drinking water
- ⚠ Electrolyte loss that water alone cannot replace
- ⚠ Energy drinks and alcohol masquerading as hydration
- ⚠ Skipping drinking to avoid bathroom trips
- ⚠ Starting the shift already behind from yesterday
Controls and safe practices
- ✓ Drink water often in the heat, on a regular schedule, not just when you feel thirsty.
- ✓ On heavy-sweat days, alternate water with an electrolyte drink or add electrolyte packets; salty snacks at breaks count too.
- ✓ Pre-hydrate: start the day topped up, and rehydrate in the evening, not just on shift.
- ✓ Limit energy drinks; they are not a substitute for water and electrolyte drinks.
- ✓ Alcohol the night before starts you the morning behind; plan for it with extra fluids.
- ✓ Cramps while drinking plenty of water can mean you lost electrolytes: rest in the shade, have an electrolyte drink, and tell the foreman.
What OSHA says
Exact words from the official text, with a link to each paragraph.
“An adequate supply of potable water shall be provided in all places of employment.”
“Portable containers used to dispense drinking water shall be capable of being tightly closed, and equipped with a tap. Water shall not be dipped from containers.”
“Any container used to distribute drinking water shall be clearly marked as to the nature of its contents and not used for any other purpose.”
“For longer jobs that last more than two hours, employers should provide electrolyte-containing beverages such as sports drinks. Workers lose salt and other electrolytes when they sweat.”
“Workers should not rely on feeling thirsty to prompt them to drink. They should be reminded to drink on a regular basis to maintain hydration throughout their shift and beyond.”
Site check before the talk
Walk the site and tick each line. Each line comes from the text quoted above.
- ☐There is enough drinking water on site for the whole crew all day. (29 CFR 1926.51(a)(1))
- ☐Water coolers close tight and have a tap; nobody dips water out. (29 CFR 1926.51(a)(2))
- ☐Water jugs are marked as drinking water and used for nothing else. (29 CFR 1926.51(a)(3))
- ☐On jobs over two hours in the heat, sports drinks or other electrolyte drinks are on hand. (OSHA Heat: Water. Rest. Shade.)
- ☐Drink on a regular schedule all shift, not only when you feel thirsty. (OSHA Heat: Water. Rest. Shade. (thirst))
Quotes checked word for word against the official OSHA text on October 5, 2026. This is a summary for a crew talk, not legal advice; the full official text governs. How we check
Crew discussion questions
- How much water is actually going per person on hot days here?
- Do we stock electrolyte packets or drinks, and who refills them?
- Who gets cramps at night after hot shifts? That is a sign.
- What are we drinking at lunch: hydration or dehydration?
Applicable OSHA standards
29 CFR 1926.51
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