A contract construction worker was injured Tuesday morning when he fell 15 to 20 feet from scaffolding into the basement of a building he was working on in the Laurel area, authorities said.

The incident occurred about 9:30 a.m. at what is known as the Parkway Wastewater Treatment Plant in the 10100 block of Canadian Way, said Prince George’s County Assistant Fire Chief Ronald Bridges. Bridges said the worker, a man believed to be about 30, was on scaffolding working on new construction there when he fell.

Prince George’s County firefighters had to pull the man from the basement using a rescue basket and ladder truck, Bridges said. He said the man had sustained injuries to his lower extremities, though he was conscious, alert and expected to survive.

Bridges said he was unsure how serious the man’s injuries were. He was transported to a nearby hospital for treatment, Bridges said.