J.K.
If your location is correct, you can donate your milk but you can't sell it. California state law bans the sale of human breast milk.
"California Health and Safety Code - Chapter 87, Section 1647:
The procurement, processing, distribution, or use of human milk for the purpose of human consumption shall be construed to be, and is declared to be for all purposes, the rendition of a service by each and every nonprofit organization and its employees participating therein, and shall not be construed to be, and is declared not to be, a sale of the human milk for any purpose or purposes."
If you want to donate, here are some sites with information:
National Milk Bank (milk used to create infant supplement)
http://www.nationalmilkbank.org/index.php/donor/qualifica...
Milk Share (direct milk for infants)
http://milkshare.birthingforlife.com/donorscreening
Human Milk Banking Association of America
https://www.hmbana.org/