Los Angeles is seventh among the nation's 20 largest cities in the percentage of drivers with alcohol-related driving violations, according to a study released today.

The study by the insurance information website Insurance.com was based on information reported by users seeking auto premium quotes over the last three years.

Three other California cities were on the list -- San Diego was first, San Jose second and San Francisco eighth.

Though factors such as proximity to colleges or popular urban night-life centers might affect a city's level of alcohol-related violations, strict law enforcement also could play a key role, the study notes.

Here is the ranking of the cities studied. Boston was excluded due to lack of available data.

1) San Diego

2) San Jose

3) Charlotte, N.C.

4) Phoenix

5) Columbus, Ohio

6) Indianapolis

7) Los Angeles

8) San Francisco

9) Austin, Texas

10) Jacksonville, Fla.

11) San Antonio

12) Dallas

13) Houston

14) Fort Worth, Texas

15) Memphis, Tenn.

16) Philadelphia

17) New York

18) Baltimore

19) Chicago

20) Detroit