Cottage Food Operations: San Mateo vs South San Francisco
How do cottage food operations rules compare between San Mateo, CA and South San Francisco, CA?
San Mateo and South San Francisco have similar restriction levels.
San Mateo, CA
San Mateo County
Cottage food operations in San Mateo are permitted under California's Homemade Food Act (AB 1616/AB 1266). Class A (direct sales) requires self-certification with San Mateo County. Class B (indirect sales to stores) requires a county health permit. Revenue is capped at $75,000 per year.
View full San Mateo rules →South San Francisco, CA
San Mateo County
Unincorporated San Mateo County follows California Homemade Food Act (AB 1616) and Microenterprise Home Kitchen Operations (MEHKO, AB 626). Class A and Class B cottage food operations allowed. SMC opted in to MEHKO permitting in 2022 — hot meals permitted from registered home kitchens.
View full South San Francisco rules →Key Facts Comparison
| Fact | San Mateo | South San Francisco |
|---|---|---|
| Class A | Direct sales — self-certification | - |
| Class B | Indirect sales — county permit | - |
| Revenue Cap | $75,000 per year | - |
| State Law | CA Homemade Food Act | - |
| County Health | SM County — 650-372-6200 | - |
| Class A Cap | - | $75,000 annual |
| Class B Cap | - | $150,000 annual |
| MEHKO | - | Adopted 2022 |
| MEHKO Limit | - | 30 meals/day |
| Agency | - | SMC Environmental Health |
Highlighted rows indicate differences between cities.
San Mateo FAQ
Can I sell baked goods from my home in San Mateo?
Yes. Under the Homemade Food Act, approved shelf-stable foods can be sold. Register with San Mateo County Environmental Health.
What foods can I sell?
Baked goods, dried fruits, granola, candy, jams, and other shelf-stable items. Dairy, meat, and refrigerated items are not permitted.
How many customers can visit per day?
San Mateo's home occupation rules limit client visits to 5 per day under SMMC Section 27.16.040.
South San Francisco FAQ
Who enforces cottage food rules in San Mateo County?
San Mateo County's code enforcement division is responsible for home business ordinances. You can report violations or request information through the San Mateo County government website or by calling the main municipal line.
What are typical penalties for violating cottage food rules?
Most San Mateo County home business violations start with a written warning followed by escalating civil fines for repeat offenses. Specific dollar amounts and any criminal-misdemeanor exposure depend on the section of code; consult San Mateo County's municipal code or staff for the current penalty schedule.
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