She was struck while crossing the street at the intersection of Ocean and Miramar avenues at about 1:40 p.m.
The vehicle was carrying three male SFPUC employees, including the driver, who has worked for the city for 23 years, SFPUC spokesman Tyrone Jue said.
The driver and two passengers have been placed on non-driving status while San Francisco police investigate the accident.
The SFPUC is also conducting an internal investigation, and will be reminding field staff of proper defensive driving techniques.
The incident is believed to be the first pedestrian fatality involving the SFPUC in the past 30 years.
"I wish to extend my sincerest and heartfelt condolences to the family and loved ones of Ms. Xiu Fang Huang," SFPUC General Manager Ed Harrington said in a statement.