San Diego vs San Francisco
Side-by-side FOG compliance comparison between San Diego, CA and San Francisco, CA.
| Requirement | San Diego, CA | San Francisco, CA |
|---|---|---|
| Plumbing Code | UPC (California Plumbing Code based on Uniform Plumbing Code) | UPC (California uses Uniform Plumbing Code) |
| Min. Trap Size | Gravity grease interceptors minimum 750 gallons for FSEs; sizing per California Plumbing Code Section 1014.2; hydromechanical interceptors minimum 20 GPM for under-sink applications | 1,000 gallons minimum for gravity grease interceptors; smaller hydromechanical interceptors must be minimum 50 GPM and certified by PDI |
| Pumping Frequency | Every 90 days minimum or when FOG accumulation reaches 25% of interceptor capacity | At minimum every 90 days; more frequent pumping required if the 25% rule is exceeded at any inspection |
| 25% Rule | Yes | Yes |
| Permit Required | Required | Required |
| Permit Fee | FOG Discharge Permit required; annual permit fees typically $150-$400 depending on facility class | Wastewater discharge permit fees vary; FOG-specific facility registration is included in the industrial waste permit program |
| Max Fine | $10,000 per violation per day under San Diego Municipal Code; administrative civil penalties also available | $10,000 per day per violation under San Francisco Public Works Code; additional state penalties may apply under California Water Code |
| Inspections | City of San Diego Public Utilities Department conducts inspections; FSEs inspected on a risk-based schedule, typically every 1-3 years | At least annually; SFPUC may inspect more frequently based on risk or compliance history |
| Record Keeping | Yes | Yes |
| Authority | City of San Diego Public Utilities Department, Environmental Monitoring and Technical Services Division | San Francisco Public Utilities Commission (SFPUC) Wastewater Enterprise; San Francisco Department of Public Health (DPH) for food facility permits |
| Establishments | 7,761 | 3,920 |
Key Differences
Even though both cities are in California, their FOG compliance requirements can differ significantly at the municipal level. Here are the most important differences restaurant operators should know:
- San Diego follows the Uniform Plumbing Code (UPC), while San Francisco uses the Uniform Plumbing Code (UPC). This affects trap sizing calculations and installation standards.
- Pumping schedules differ: San Diego requires "Every 90 days minimum or when FOG accumulation reaches 25% of interceptor capaci", whereas San Francisco requires "At minimum every 90 days".
- Both cities enforce the 25% rule, requiring grease traps to be pumped when grease and solids reach 25% of the trap's capacity.
- Fines differ: San Diego penalties can reach $10,000 per violation per day under San Diego Municipal Code; administrative civil penalties also available, compared to $10,000 per day per violation under San Francisco Public Works Code; additional state penalties may apply under California Water Code in San Francisco.
What This Means for Restaurant Operators
If you operate food service establishments in both cities, understanding these regulatory differences is critical for compliance. Permit requirements vary, so check with each city's wastewater authority before opening a new location. Different plumbing codes (UPC (California Plumbing Code based on Uniform Plumbing Code) vs UPC (California uses Uniform Plumbing Code)) mean trap sizing calculations may produce different results for the same kitchen setup. Always verify current requirements directly with your local wastewater authority or plumbing inspector.
Frequently Asked Questions
How do grease trap requirements compare between San Diego and San Francisco?
San Diego follows the Uniform Plumbing Code (UPC), while San Francisco uses the Uniform Plumbing Code (UPC). This affects trap sizing calculations and installation standards. Pumping schedules differ: San Diego requires "Every 90 days minimum or when FOG accumulation reaches 25% of interceptor capaci", whereas San Francisco requires "At minimum every 90 days".
Which city has stricter grease trap enforcement, San Diego or San Francisco?
Enforcement varies: both cities have similar permit requirements. San Diego fines: $10,000 per violation per day under San Diego Municipal Code; administrative civil penalties also available. San Francisco fines: $10,000 per day per violation under San Francisco Public Works Code; additional state penalties may apply under California Water Code. Always verify with local authorities.
How do pumping schedules differ between San Diego and San Francisco?
San Diego: Every 90 days minimum or when FOG accumulation reaches 25% of interceptor capacity. San Francisco: At minimum every 90 days; more frequent pumping required if the 25% rule is exceeded at any inspection.
Regulations change frequently. Always verify current requirements with your local wastewater authority or plumbing inspector before making compliance decisions. Last updated: March 2026.
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