Three Workers Die in Toxic-Gas Incident at Tata’s Hosur Plant

By Rebecca Stone

Three contract workers died late Monday following an incident in which one fainted while looking into a nano-filtration feed tank at Tata Electronics’ iPhone manufacturing unit in Hosur, Tamil Nadu, The New Indian Express reported.

Reuters reported that the workers were carrying out cleaning and maintenance inside the tank. The utility facility was operated by Nalco Water, a subsidiary of US-based water-treatment company Ecolabs. Nalco confirmed that the workers were employed by one of its subcontractors.

Nalco Water said: “We are deeply saddened by the tragic incident that resulted in the deaths of three workers engaged by a sub-contractor of Nalco Water… This incident occurred in a utility facility, operated by Nalco Water. We are working with the local authorities in the investigation of this incident.”

What happened inside the tank?

The two remaining workers entered the tank to check on their colleague and collapsed from asphyxiation, the report said. All three were declared dead on arrival at the hospital. Preliminary investigation suggested toxic-smoke inhalation, while police said they would establish the final cause after a post-mortem.

The New India Express cited official sources who said there were no proper safety measures in place while workers handled the effluent treatment plant. The reports did not identify the gases, their concentrations or the workers’ protective equipment, leaving toxic-smoke inhalation as a preliminary description rather than a completed toxicology finding.

Who is investigating the deaths?

Sources told Reuters that the deaths will be probed by Apple, Tata Electronics and local authorities. Another source reportedly said an Apple team would visit the plant to assist with the investigation.

Separately, Financial Express reported that a joint team of officials from the Tamil Nadu Pollution Control Board (TNPCB) and the local Directorate of Industrial Safety and Health (DISH) would investigate Tata Electronics.

What has happened at the Hosur plant before?

In 2024, nearly two years before the latest incident, a massive fire engulfed the factory, injured 11 people and halted production.

In June this year, TNPCB reportedly warned that the plant would be shut down over alleged wastewater contamination of wells in adjacent farmland. Tata Electronics said an independent analysis showed compliance with regulatory norms. The conglomerate later said the pollution control board dropped further action after the company confirmed it had addressed all queries.

Separately in June, a ransomware group posted more than 2 lakh, or 200,000, files on the dark web, including sensitive supplier information stolen from the same Hosur iPhone assembly plant.

Tata’s compliance claim addressed the wastewater warning, not the reported maintenance fatality. The source does not say whether its independent analysis covered tank-entry procedures, maintenance planning or protective equipment, so that earlier claim cannot resolve the separate safety allegations.

What does this mean for iPhone production?

No production halt was reported. The source provides no figures for lost output, iPhone shipments, installed capacity or pricing. The fatal work occurred in a supplier-operated utility during maintenance, while the 2024 fire did halt assembly production.

For Apple and Tata Electronics, the immediate commercial test is whether investigators find deficient tank-entry controls or broader effluent-treatment safety failures. Any required remediation could affect operating continuity, but no agency timeline, corrective-action order or production estimate appeared in the reports.

Until the post-mortem and joint regulatory review clarify the cause and required fixes, there is no defensible basis to forecast a capacity adjustment, production reallocation or price change at the Hosur operation.