WASHINGTON – Cold water on a hot, humid day in the District feels great, but one way of cooling off has caused some problems.

Damion Lampley at DC Water says opening hydrants is a big issue in the summer, particularly when temperatures reach 90 degrees or hotter. The fire hydrant problem often results in 10 or 11 calls per day to the office in very hot weather.

Damion Lampley with DC Water says it is illegal and can cause low pressure for firefighters. Lampley also says it can be dangerous for the people trying to cool off if 1,000 gallons of water per second are blasting out of a hydrant.

“The caps of the hydrants become missiles and projectiles, which can injure someone,” he says.

Andrew Mollenbeck contributed to this report. Follow @mollenbeckWTOP and @WTOP on Twitter.