The U.S. Bureau of Labor Statistics, which calculates annual fatality rates for a range of industries, does not have a standard code for tower climbing and, thus, does not compile uniform data on tower workers' fatality rates.

The U.S. Occupational Safety and Health Administration calculated the fatality rate for tower workers in 2008, setting out its methodology in draft reports and presentations produced as part of a joint safety initiative by OSHA and the tower industry. ProPublica and PBS "Frontline" obtained these records.

OSHA estimated that in 2008 there were 8,695 tower workers, the records show. Based on this estimate and the number of fatalities that occurred in 2008, OSHA calculated deaths per 100,000 workers for the tower industry for that year. OSHA also compared its 2008 fatality rate for the tower industry with that of the construction industry, finding the tower industry’s rate was substantially higher than the average rate for construction occupations in the U.S.

We used OSHA’s methodology to calculate deaths per 100,000 workers for the tower industry for each year from 2003 to 2010. We found an average fatality rate of 123.6 per 100,000 workers for the tower industry during this period. Over the same time span, government data shows the fatality rate in the construction industry was 10.7 per 100,000 workers. The average annual fatality rate for the tower industry was more than 10 times greater than that of the construction industry.

Average Death Rate per 100,000 Workers, from 2003-10