You do need a permit for an indoor rainwater system. The requirements are found in Chapter 17 of the California Plumbing Code (download the code here)
What you will specifically be required to do is determined by your local building department, so you should have the designer/installer (you or someone you hire) go in and talk to them early on. I would familiarize yourself with the code so you’re better able to have a conversation with them about the details.
If you’re not familiar with ARCSA, they are a good resource and you can see other similar projects. Also companies like Rain Harvesting Supplies will help you choose specific materials/products over the phone and can let you know about generally accepted designs. You could bring in a generic design to see what your building department will say and if they want alternations, like this:
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