Many states have regulations on weed control products. However they are frequently unable to enforce them. We have customers in every state.
California does require a permit. The best place to get started is to email the Aquatic Invasive Plant Control Program at firstname.lastname@example.org.
Beyond that, contact your local US Army Corps of Engineers. The Sacramento District Headquarters Office can be reached at (916) 557-5250 and email@example.com.
If you find out what permitting guidelines you have, please do us a favor and let us know at firstname.lastname@example.org