State Assemblyman Roger Hernandez, D-West Covina, was arrested around 2 a.m. on March 27 after failing a field sobriety test, police said.
An officer had spotted Hernandez, 36, weaving in a car near Concord Avenue and Meridian Park Boulevard and failing to use turn signals, according to police.
Hernandez was taken to Concord Police Jail, where a blood test was performed. A 29-year-old woman who was with him in the car was released at the scene.
Hernandez's blood-alcohol level was 0.08 at the time of his arrest, chemical test results now reveal, according to police. That means he was just over the threshold for being considered legally intoxicated.
Police said they have turned their information over to the district attorney's office for a charging decision.
Hernandez is the state Assembly's assistant majority whip, and represents the 57th Assembly district, which includes the cities of Azusa, Baldwin Park, Covina and Irwindale.
A spokesman from the assemblyman's office was not available for comment Wednesday morning.