The Partridge Family star was pulled over near Los Angeles' LAX airport after making an illegal turn and police detected alcohol when they approached the car, according to TMZ.com.
Cassidy was given a field sobriety test and was reportedly found to have a blood alcohol level of more than twice the legal limit.
He was arrested for driving under the influence and was released hours later after posting $15,000 (£9,375) bail.
It is the third time the actor and singer has been booked for drink driving offences.
In 2011, he pleaded no contest after being arrested for driving while drunk in Florida, and he had his licence suspended for six months and was put on a year's probation.
In 2013, he was stopped and subsequently failed a field sobriety test in New York, and was charged with a felony driving while intoxicated as a result of his previous arrest.