Toxic gas deaths: Cleaning contractor and manager face court in Singapore over fatal 2024 incident

Legal proceedings have begun against a cleaning contractor and a worksite manager in Singapore following a 2024 industrial incident that killed two workers. The charges, brought by the Ministry of Manpower, relate to safety failures at a national water agency facility where employees were exposed to lethal levels of hydrogen sulfide gas.

Charges over Choa Chu Kang Waterworks deaths

Cleaning contractor Stargroup Est and worksite manager Lim Beng Hock face multiple charges stemming from the incident on May 23, 2024, at the Choa Chu Kang Waterworks. Two workers died after inhaling toxic gas while performing maintenance duties.

According to court proceedings, Stargroup Est is accused of failing to implement necessary risk management measures to protect worker safety. Lim Beng Hock faces 12 individual charges under the Confined Spaces Regulations, with authorities alleging he failed to exercise due diligence when issuing permits for work in restricted areas.

The national water agency, PUB, has already been fined for its role in the incident — specifically for allowing employees to enter confined spaces that lacked adequate ventilation. A PUB officer also received a stern warning. The cases for both the contractor and the manager have been adjourned until August 13, 2026.

Hydrogen sulfide in confined spaces is one of the most underestimated hazards in water treatment and industrial workplaces. Under COSHH regulations, employers have a legal duty to assess every dangerous substance their workers may encounter — and failing to do so has cost lives and led to criminal charges. A free COSHH Risk Assessment Toolkit provides 43 ready-to-use templates, checklists, and toolbox talks to help you identify hazardous substances, document your assessments, and protect your workforce. Download the free COSHH Risk Assessment Toolkit

Wessex Water prosecuted over 2020 Avonmouth explosion

In a separate enforcement action in the United Kingdom, the Health and Safety Executive (HSE) authorised criminal charges against Wessex Water on July 15, 2026. The charges under the Health and Safety at Work etc Act follow an investigation into a fatal explosion at a water treatment site in Avonmouth on December 3, 2020.

The blast killed four people: 16-year-old Luke Wheaton, 57-year-old Ray White, 63-year-old Brian Vickery, and 64-year-old Mike James. While a previous investigation into corporate manslaughter was dropped by police in July 2024, the HSE determined that criminal prosecution for health and safety failures was warranted.

Persistent safety failures highlighted globally

Recent reports have highlighted ongoing safety failures in industrial and municipal environments worldwide.

On July 15, 2026, the US Chemical Safety Board (CSB) released an update regarding a hydrogen sulfide release at the Woodland Pulp mill in Baileyville, Maine. The incident, which occurred on January 27, killed two workers and exposed ten others. CSB findings indicated the facility lacked personnel control, adequate ventilation, and hydrogen sulfide detectors. Investigators noted that victims were likely exposed to gas concentrations exceeding 500 parts per million.

The CSB's findings at the Woodland Pulp mill — no ventilation, no gas detectors, no personnel control — point to a fundamental gap in risk management that is far too common across industries. Many organisations lack the structured approach needed to identify and address such hazards before they cause harm. A free Risk Assessment Toolkit offers 41 ready-to-use templates, checklists, and training materials to help you build a robust risk management system that actually protects your workers. Download the free Risk Assessment Toolkit

In other recent developments:

• Noida, India: On July 15, 2026, a sanitation worker died after inhaling toxic fumes while clearing a sewer blockage in Gheja village. The Noida Authority has filed a criminal case against contractor Shivji Constructions and terminated a junior engineer for failing to ensure adequate safety gear was used.

• Yongin, South Korea: A subcontracted worker at a food processing plant died on July 15, 2026, several weeks after being caught in a conveyor belt. Police have booked safety managers for occupational negligence after determining a required safety cover was missing.

• Singapore: The Transport Safety Investigation Bureau published a report on July 15, 2026, regarding the 2025 death of a Chief Officer found in a cargo hold of a bulk carrier transiting the Mozambique Channel.

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