Hydration Science and Electrolyte Management

Talking points

1. Drink at least one cup (8 oz) of water every 15-20 minutes when working in heat — even before you feel thirsty. Thirst lags behind dehydration by 30-60 minutes.
2. During heavy sweating, you lose sodium and potassium along with water. Replacing water without electrolytes can cause hyponatremia (low sodium), which mimics heat exhaustion symptoms.
3. Sports drinks or electrolyte solutions are appropriate during extended heat exposure. Dilute them to half strength if the sugar content is high — excess sugar slows absorption.
4. Coffee and energy drinks are diuretics that increase fluid loss. They are not substitutes for water and can mask fatigue that signals your body needs rest.
5. Monitor urine color as a hydration indicator. Pale yellow is adequate. Dark yellow or amber means you are already dehydrated. Clear may indicate overhydration.

Ask the crew

How much water have you had so far today — and do we have electrolyte replacement available on site?

Standards this talk is built on

• Section 5(a)(1)

A toolbox talk is a short safety briefing. It supports the training a standard requires; it does not replace it.

Sign-in sheet

Print this page to collect signatures, or run the talk in Jobsite and workers sign in on their phones.

© Jobsite. Free to read aloud, print and use in your own crew's safety meetings. Republishing, reselling or bulk-copying these talks is not permitted.