How to dispose of Paint Thinner & Solvents in California

California rules

Take to CUPA hazardous waste facilities. Some hardware stores hold collection events.

Never pour paint thinner or solvents down drains or into storm sewers.
Let used paint thinner sit — solids settle and clear thinner can be reused.
Store in original container or approved solvent-resistant container with tight lid.
Take to household hazardous waste collection facility.
Keep away from heat and open flames — solvents are extremely flammable.