Sgt. Ken Savano said that countywide, 81 people were arrested over the holiday weekend this year compared to 31 arrests in 2008.
The anti-DUI Avoid the 13 campaign, with Petaluma police as the lead agency, was carried out Friday through Monday.
Savano, of the Petaluma Police Department's traffic division, said there were no fatal DUI collisions in the county over the weekend. Two minor-injury DUI collisions were reported, Savano said.
Five people were arrested for outstanding DUI warrants, Savano said.
At a DUI checkpoint at Lakeville and Wilson streets in Petaluma between 6 p.m. Friday and 2:30 a.m. Saturday, there were four DUI arrests; 19 arrests for driving without a license; two arrests for driving on a suspended license; and one arrest for an outstanding warrant, Savano said. Police towed 23 vehicles.
Savano said Petaluma police arrested four more people for DUI Saturday night. The eight DUI arrests in Petaluma are included in the 81 DUI arrests countywide.
Police from Sonoma County's nine cities, the county sheriff's and probation departments, the California Highway Patrol and police from Santa Rosa Junior College and Sonoma State University participated in the Avoid campaign.