London cab drivers protest private taxi service Uber, the mobile phone app, on June 11, 2014.

Car service app Uber has built a sizable business, and hasn't been too concerned about state and city regulations. But Tuesday in Sacramento, California, legislators are discussing the possibility of clamping down on the growing business.

And it's not just Uber that is in the crosshairs of California regulators. Lyft, Rideshare and other competitors to the traditional taxi business may be asked to disclose more information about drivers, vehicles and insurance.