Phoenix vs Tucson
Side-by-side FOG compliance comparison between Phoenix, AZ and Tucson, AZ.
| Requirement | Phoenix, AZ | Tucson, AZ |
|---|---|---|
| Plumbing Code | UPC (Arizona adopts UPC statewide) | IPC (City of Tucson adopts amended IPC; 2018 IPC Amendments document governs local requirements) |
| Min. Trap Size | Gravity grease interceptors minimum 750 gallons for food service establishments; sizing per Phoenix City Code and Arizona Plumbing Code based on fixture count and flow rate; point-of-use interceptors minimum 20 GPM | Grease interceptors sized per the International Plumbing Code (as amended by Pima County/City of Tucson). Minimum 750 gallons for exterior gravity interceptors serving full-service restaurants. Hydromechanical grease interceptors sized by GPM per connected fixture drainage load. Sizing per IPC Chapter 10 with local amendments. |
| Pumping Frequency | Every 90 days minimum; more frequently if grease accumulation exceeds 25% of capacity | Minimum every 90 days (quarterly). Pumping required more frequently if the 25% rule is triggered. |
| 25% Rule | Yes | Yes |
| Permit Required | Required | Required |
| Permit Fee | Industrial pretreatment/FOG permit required; registration fees typically $50-$150 annually | Wastewater discharge permit required; fees vary by establishment class. Contact Pima County Regional Wastewater Reclamation Department for current fee schedule. |
| Max Fine | $2,500 per violation per day under Phoenix City Code; administrative penalties may also apply | Up to $10,000 per day per violation under Pima County Code. Additional penalties for willful or repeated violations. Costs of remediation may be assessed to the violator. |
| Inspections | City of Phoenix Environmental Services Division inspects FSEs; frequency varies, typically annually for permitted facilities | Pima County conducts routine inspections on a risk-based schedule. Typically annual for compliant facilities; quarterly or more frequent for repeat violators or high-risk FSEs. |
| Record Keeping | Yes | Yes |
| Authority | City of Phoenix Water Services Department, Environmental Services Division | Pima County Regional Wastewater Reclamation Department; City of Tucson Water Department, Environmental Services Division |
| Establishments | 8,992 | 1,862 |
Key Differences
Even though both cities are in Arizona, their FOG compliance requirements can differ significantly at the municipal level. Here are the most important differences restaurant operators should know:
- Phoenix follows the Uniform Plumbing Code (UPC), while Tucson uses the Uniform Plumbing Code (UPC). This affects trap sizing calculations and installation standards.
- Pumping schedules differ: Phoenix requires "Every 90 days minimum", whereas Tucson requires "Minimum every 90 days (quarterly). Pumping required more frequently if the 25% r".
- 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: Phoenix penalties can reach $2,500 per violation per day under Phoenix City Code; administrative penalties may also apply, compared to Up to $10,000 per day per violation under Pima County Code. Additional penalties for willful or repeated violations. Costs of remediation may be assessed to the violator. in Tucson.
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 (Arizona adopts UPC statewide) vs IPC (City of Tucson adopts amended IPC; 2018 IPC Amendments document governs local requirements)) 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 Phoenix and Tucson?
Phoenix follows the Uniform Plumbing Code (UPC), while Tucson uses the Uniform Plumbing Code (UPC). This affects trap sizing calculations and installation standards. Pumping schedules differ: Phoenix requires "Every 90 days minimum", whereas Tucson requires "Minimum every 90 days (quarterly). Pumping required more frequently if the 25% r".
Which city has stricter grease trap enforcement, Phoenix or Tucson?
Enforcement varies: both cities have similar permit requirements. Phoenix fines: $2,500 per violation per day under Phoenix City Code; administrative penalties may also apply. Tucson fines: Up to $10,000 per day per violation under Pima County Code. Additional penalties for willful or repeated violations. Costs of remediation may be assessed to the violator.. Always verify with local authorities.
How do pumping schedules differ between Phoenix and Tucson?
Phoenix: Every 90 days minimum; more frequently if grease accumulation exceeds 25% of capacity. Tucson: Minimum every 90 days (quarterly). Pumping required more frequently if the 25% rule is triggered..
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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