No.
The California "speak English only" law was repealed in 2002. Employers can no longer require employees to speak only in English while working unless specific circumstances exist. If the employer can prove the necessity of requiring employees to speak only English in order to reach and maintain the goals and productivity of said business the law is not enforceable. Such stipulation can theoretically be applied to almost any business. However the ACLU has been very successful in winning large settlements for employees who file lawsuits charging civil rights violations; therefore the majority of employers adhere to the existing statute ( CA Ant. AB800 ).