Chicago vs Seattle
Side-by-side FOG compliance comparison between Chicago, IL and Seattle, WA.
| Requirement | Chicago, IL | Seattle, WA |
|---|---|---|
| Plumbing Code | IPC (Chicago Building Code based on International Plumbing Code with local amendments) | UPC (Washington State uses Uniform Plumbing Code) |
| Min. Trap Size | Grease interceptors sized per Chicago Building Code Section 18-29-1003.3.6 table; minimum 750 gallons for gravity interceptors for restaurants; hydromechanical grease interceptors rated at minimum 20 GPM for smaller facilities | 1,000 gallons minimum for gravity grease interceptors; hydromechanical interceptors per UPC sizing (typically 20-50 GPM) |
| Pumping Frequency | Every 90 days minimum or when 25% full (whichever comes first) | At minimum every 90 days for the first year; frequency may be adjusted based on monitoring records |
| 25% Rule | Yes | Yes |
| Permit Required | Required | Required |
| Permit Fee | Sewer discharge permit required; FOG registration included with building/sewer permits. Permit fees vary based on discharge volume | No separate FOG permit fee; covered under King County Industrial Waste discharge program |
| Max Fine | $1,000 per day per violation under Chicago Municipal Code; repeat offenders face escalating fines | $10,000 per day per violation under Seattle Municipal Code; King County may impose additional penalties |
| Inspections | Chicago Department of Water Management conducts inspections; frequency based on compliance history, typically annually for FSEs | Annually; King County WTD inspects FSEs on a risk-based schedule |
| Record Keeping | Yes | Yes |
| Authority | Chicago Department of Water Management | King County Wastewater Treatment Division (WTD) Industrial Waste Program; Seattle Public Utilities (SPU) for local sewer connections |
| Establishments | 12,246 | 6,372 |
Key Differences
As cities in different states, Chicago (IL) and Seattle (WA) operate under distinct regulatory frameworks. Here are the most important differences restaurant operators should know:
- Chicago follows the Uniform Plumbing Code (UPC), while Seattle uses the Uniform Plumbing Code (UPC). This affects trap sizing calculations and installation standards.
- Pumping schedules differ: Chicago requires "Every 90 days minimum or when 25% full (whichever comes first)", whereas Seattle requires "At minimum every 90 days for the first year".
- 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: Chicago penalties can reach $1,000 per day per violation under Chicago Municipal Code; repeat offenders face escalating fines, compared to $10,000 per day per violation under Seattle Municipal Code; King County may impose additional penalties in Seattle.
What This Means for Restaurant Operators
If you operate food service establishments in either city, 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 (IPC (Chicago Building Code based on International Plumbing Code with local amendments) vs UPC (Washington State 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 Chicago and Seattle?
Chicago follows the Uniform Plumbing Code (UPC), while Seattle uses the Uniform Plumbing Code (UPC). This affects trap sizing calculations and installation standards. Pumping schedules differ: Chicago requires "Every 90 days minimum or when 25% full (whichever comes first)", whereas Seattle requires "At minimum every 90 days for the first year".
Which city has stricter grease trap enforcement, Chicago or Seattle?
Enforcement varies: both cities have similar permit requirements. Chicago fines: $1,000 per day per violation under Chicago Municipal Code; repeat offenders face escalating fines. Seattle fines: $10,000 per day per violation under Seattle Municipal Code; King County may impose additional penalties. Always verify with local authorities.
How do pumping schedules differ between Chicago and Seattle?
Chicago: Every 90 days minimum or when 25% full (whichever comes first). Seattle: At minimum every 90 days for the first year; frequency may be adjusted based on monitoring records.
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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