The City of Pasadena now has an app (Android and iPhone) for reporting lots of things, like POTHOLES and other needed street repairs!
If you don't have a smartphone you can still do it through the website, Pasadena Citizen Service.
Some other things you can do, including but not limited to:
Bulky Items - Schedule Pick-up
Code Enforcement - Private Property
Parking - General Comments / Questions
Request Trash/Recycling Bins
Missed Trash Pick-up
Abandoned Trash Items
edit: It works! I've reported three potholes and they got filled within the week :)