What to know about dehydration in outdoor workers

Heat, humidity, direct sun, protective equipment, and physical exertion can increase fluid loss. Early symptoms may include thirst, dry mouth, headache, tiredness, dizziness, muscle cramps, or darker urine. Confusion, poor coordination, faintness, or unusual behaviour can signal a more serious heat illness. Alcohol can worsen fluid loss, and some medicines or health conditions may affect heat tolerance. A worker may become unwell even when the task feels familiar.

Arrange regular drink breaks before thirst becomes strong, and use a shaded or cool rest area during hot work. Wear breathable clothing where safety rules allow, pace heavy tasks, and use buddy checks so changes in behaviour are noticed. Replace meals and drinks according to workplace guidance when sweating is prolonged; very large amounts of plain water over a short time can also be unsafe. Supervisors should support acclimatisation and adjust work when heat exposure becomes difficult.

Stop work and move to a cool place for dizziness, weakness, headache, cramps, nausea, or unusual fatigue. Get emergency help for confusion, collapse, seizure, severe breathlessness, or inability to drink. Do not leave an affected worker alone or expect them to return to the task quickly. Persistent vomiting, worsening symptoms, or reduced urination needs prompt medical assessment.

Ask whether a medicine or medical condition changes your heat or fluid needs. Discuss how to plan drinks during long shifts, which symptoms mean you should stop work, and whether you need a personal plan for working in heat, humidity, or protective equipment.