Not so for the Los Angeles County Board of Supervisors.

The majority of the supervisors wash their take-home cars two or three times a week, service records show, and actually washed them more frequently after Gov. Jerry Brown ordered a 25 percent cut in urban water use. As the county's washes continue to consume tap water, some other local governments have pledged to skip washes for months or are using recirculated water.

"When government takes the initiative, it really says something about their leadership," said Rachel Stich, spokeswoman for Los Angeles Waterkeeper, an environmental group that started a pledge drive for dirty cars. "If they're going to be asking their residents to conserve water, everybody needs to be stepping up."

• Video: County employees wash officials' cars downtown

Supervisor Mark Ridley-Thomas had his cars washed more frequently than any of the others, according to the documents obtained under the state public records law. In 2014, Ridley-Thomas had one of his Chrysler 300 Limited sedans washed an average of 2.7 times per week. After the mandate in April, workers washed it 3.1 times per week.