My employer locks the water fountain during shifts to prevent people wasting time.

This is ILLEGAL. Under the Workplace (Health, Safety and Welfare) Regulations 1992, Regulation 22, your employer MUST provide an adequate supply of wholesome drinking water, readily accessible at all times, at suitable and clearly marked locations. Restricting water access during physical work in a hot environment is extremely dangerous and could lead to dehydration, heat exhaustion, kidney damage, and even heatstroke. Report this immediately to HSE: 0300 003 1647. You can report anonymously.

Dehydration during physical work can cause headaches, dizziness, confusion, dark urine, fatigue, and in severe cases, heatstroke. Adults should drink at least 6-8 glasses of water per day, more during physical activity or in hot environments. Signs of dehydration include dark yellow urine, feeling thirsty, tired, dizzy, dry mouth, and passing urine less than 4 times a day.

This is an important workplace health question. Based on the information above, we recommend speaking with your GP if you have health concerns and contacting HSE (0300 003 1647) if your employer is not meeting their legal obligations. Keep written records of all incidents and communications. Please note: this is general health information, not a substitute for professional medical advice.