San Joaquin County, CA Cannabis Regulations: Home Cultivation (2026)

California Proposition 64 (the Adult Use of Marijuana Act, Health & Safety Code §11362.1) permits adults 21 and older to possess and cultivate up to 6 cannabis plants per private residence for personal non-commercial use. Local jurisdictions may regulate cultivation but cannot ban personal indoor cultivation. San Joaquin County has exercised its regulatory authority through Development Title and County Code Chapter 9-1080 (Cannabis Cultivation): all personal cultivation in unincorporated areas must occur inside the primary residence or within a fully enclosed, locked, opaque accessory structure (detached garage, permitted shed meeting building code); outdoor cultivation — even within a yard — is prohibited for personal use. Plants and grow lights must not be visible from any public right-of-way or adjoining property. Cultivation accessory structures must meet setback and electrical-permit requirements and have adequate ventilation/odor control (carbon filtration recommended); odor that causes a nuisance (HSC §11362.1(f)) is actionable. The cannabis count is per residence, not per adult — a household of 4 adults over 21 still has a 6-plant cap. Commercial cultivation is separately regulated under county Cannabis Business Ordinance and is allowed only in specific zones with Use Permit. Landlords may prohibit cannabis cultivation in lease agreements.