By Ryan Knutson and Melanie Trottman 

Cellphone tower contractors and the companies that hire them need to strictly comply with safety standards, the Occupational Safety and Health Administration said Tuesday, citing "an alarming increase" in preventable injuries and deaths.

The warning in a letter to employers followed a rise last year in fatalities among tower climbers, a job once called the most dangerous in America. The agency said it is concerned about the possibility of future incidents, especially when employees of subcontractors are doing the hazardous work, and warned that companies could face penalties if they don't do enough to prevent falls.

It also said it would look not only at the contractors that do the work, but also at the larger companies and carriers that order it up.

"It is imperative that the cell tower industry take steps immediately to address this pressing issue," the agency said in the letter, which was dated Monday and sent Tuesday to about 100 communication-tower employers. "It is your responsibility to prevent workers from being injured or killed while working on communication towers."

Fatalities in the tower industry soared last decade as carriers raced to upgrade their networks with 3G technology to allow easier Web browsing on phones. After a brief slowdown, fatalities have picked up as wireless carriers scramble to upgrade their networks again, this time with so-called LTE technology, which promises much faster wireless speeds.

While many of the fatalities are on cell towers, some are on other types of communication towers, such as those used for broadcast television and radio.

Thirteen deaths occurred in 2013, more than in the previous two years combined, OSHA said. Most of the 13 resulted from falls, the agency said. In the past few months, tower workers also have been injured or killed by falling objects, structural collapses and equipment failures.

"This disturbing trend appears to be continuing," the agency said, citing four worker deaths that have occurred in the first five weeks of this year.

Tuesday's announcement follows an internal memo OSHA officials sent its compliance officers and regional administrators in November mandating that its investigators pay closer attention to the industry.

In a strategic shift, the November letter encouraged compliance officers to pay special attention to the chain of contractors connected to the site, as well as the wireless carriers that ordered the work. Investigators "should make sure to collect information regarding contract oversight issues, and obtain copies of any relevant contract documents," the letter said. "Try to identify, as far as possible, not only the name of the company performing the tower work, but the tower owner, carrier, and any other relevant parties in the contracting chain."

In the past, it has been difficult for OSHA to issue citations to wireless carriers and tower owners, which usually hire subcontractors to work on the tower, because the workers aren't their employees and they aren't typically present when accidents happen.

Verizon Wireless, Sprint Corp. and T-Mobile US Inc. didn't immediately comment late Tuesday. AT&T Inc. declined to comment.

The companies have said previously that tower work isn't their core business and, while they care about safety, they shouldn't be held responsible when subcontractors violate safety standards. Carriers have said contractors that violate safety standards are subject to termination.

It wasn't immediately clear whether Tuesday's letter would be sent to wireless carriers.

OSHA also subjected the industry to scrutiny in 2006, when there were 18 communication tower fatalities. The agency had a partnership with the tower industry trade group, but the major wireless carriers didn't participate. In 2008, the head of OSHA at the time said tower climbing was "the most dangerous job in America."

Although the number of fatal injuries in America's workplaces fell 7% in 2012 from 2011, upticks in the construction and oil and gas industries prompted Labor Secretary Tom Perez to call for more diligence last August. Prior to that, the deaths in private-sector construction had declined for five consecutive years. Mr. Perez's call came as OSHA was investigating the spate of deaths in the wireless industry.

OSHA not only requires employers to provide adequate fall protection equipment but to also train employees how to use it properly and ensure they do so. The agency has created a new Web page focused on communications tower work and says on the site that some of the more frequent hazards include falls from great heights, electrical dangers, bad weather, falling objects, failed equipment and tower collapses.

Write to Ryan Knutson at ryan.knutson@wsj.com and Melanie Trottman at melanie.trottman@wsj.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

AT&T (NYSE:T)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more AT&T Charts.
AT&T (NYSE:T)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more AT&T Charts.