Tomoo Kawai is scheduled to be arraigned Dec. 17. He could get probation and up to six months in jail if convicted.
Used adult diapers first began appearing along a stretch of East Coast Highway between Cameo Highlands Drive and Morning Canyon Road in the summer of 2011.
In December 2011, there were at least three separate occasions where the diapers littered the roadway, causing cyclists to swerve to avoid them before city crews were able to remove them.
One resident reported seeing dirty mess after a December dump, with 6 to 10 diapers spread onto the westbound lanes of the highway.
Drivers would see the bags of between four and 12 diapers a few times a week, sometimes running over them to create even more of a mess, Laguna Beach Capt. Jason Kravetz said in a press release.
On Monday, detectives were setting up surveillance along North Coast Highway when they came across bags of diapers that appeared to have been recently abandoned, the release said.
In the bag, an envelope addressed to a medical office in Fullerton was attached to one of the diapers.
Officers discovered an employee of the office lived in Newport Coast and set up surveillance of his home in the gated community.
At 10:45 p.m., the 67-year-old man left, and police followed his Lexus south into Laguna Beach.
After an abrupt U-turn at Irvine Cove, detectives stopped him. Inside the car, officers saw a bag of used diapers in the passenger seat, Kravetz said.
The man was not arrested, but police say they plan to present the case to the District Attorney's Office for prosecution.