Houston vs Seattle
Side-by-side FOG compliance comparison between Houston, TX and Seattle, WA.
| Requirement | Houston, TX | Seattle, WA |
|---|---|---|
| Plumbing Code | IPC (Texas adopts IPC statewide; Houston amends locally) | UPC (Washington State uses Uniform Plumbing Code) |
| Min. Trap Size | Minimum 750 gallons for gravity grease interceptors for food service establishments; sizing based on fixture count and flow rate per Houston Plumbing Code; hydromechanical interceptors minimum 20 GPM | 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 | 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 | Grease trap permit/registration required; fees approximately $100-$250 depending on establishment size | No separate FOG permit fee; covered under King County Industrial Waste discharge program |
| Max Fine | $2,000 per violation per day under Houston Code of Ordinances Chapter 47; repeat violations up to $4,000/day | $10,000 per day per violation under Seattle Municipal Code; King County may impose additional penalties |
| Inspections | Houston Health Department and Public Works conduct inspections; typically annually or upon complaint | Annually; King County WTD inspects FSEs on a risk-based schedule |
| Record Keeping | Yes | Yes |
| Authority | Houston Public Works and Engineering Department; Houston Health Department (grease transporter licensing) | King County Wastewater Treatment Division (WTD) Industrial Waste Program; Seattle Public Utilities (SPU) for local sewer connections |
| Establishments | 10,038 | 6,372 |
Key Differences
As cities in different states, Houston (TX) and Seattle (WA) operate under distinct regulatory frameworks. Here are the most important differences restaurant operators should know:
- Houston 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: Houston requires "Every 90 days minimum or when 25% full", 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: Houston penalties can reach $2,000 per violation per day under Houston Code of Ordinances Chapter 47; repeat violations up to $4,000/day, 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 (Texas adopts IPC statewide; Houston amends locally) 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 Houston and Seattle?
Houston 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: Houston requires "Every 90 days minimum or when 25% full", whereas Seattle requires "At minimum every 90 days for the first year".
Which city has stricter grease trap enforcement, Houston or Seattle?
Enforcement varies: both cities have similar permit requirements. Houston fines: $2,000 per violation per day under Houston Code of Ordinances Chapter 47; repeat violations up to $4,000/day. 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 Houston and Seattle?
Houston: Every 90 days minimum or when 25% full. 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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