Grease Trap/Interceptor Permit in Spokane, Washington (2026)
Without a Grease Trap/Interceptor Permit from the City of Spokane's Wastewater Management department, you cannot connect your commercial kitchen's plumbing to the city sewer system, halting construction and preventing your final building inspection. This requirement, often called a Grease Control Device permit, is a mandatory step for any food service facility handling fats, oils, and grease (FOG). Key facts:
- 31 fields — ApronPrep auto-fills 26
- No government filing fee for the application itself (costs for equipment and installation vary)
- Timeline varies based on plan review and installation scheduling
Analyzed from Grease Trap/Interceptor Permit
84% from one compliance interview
Manual entry or document upload required
Why You Need a Grease Trap/Interceptor Permit
To legally connect your restaurant to Spokane's sanitary sewer system, you must obtain a Grease Trap/Interceptor Permit from the City of Spokane Wastewater Management Division. This permit is mandated by the city's Sewer Use Ordinance (Title 17 of the Spokane Municipal Code) and specific plumbing codes adopted by the city. These regulations establish strict limits on fats, oils, and grease (FOG) discharge into the public sewer to prevent blockages that can cause costly and hazardous sanitary sewer overflows. The permit application verifies that your proposed or existing grease interceptor's size, type, and installation location meet these local sewer use and water connection requirements.
Operating without this permit or violating its conditions triggers significant and escalating consequences from the city. Common penalties include:
- Immediate Fines and Daily Penalties: The city issues citations for violations, with fines that can accrue daily until the issue is corrected, per the Sewer Use Ordinance's enforcement provisions.
- Service Disconnection or Cease-and-Desist Orders: Wastewater Management can legally disconnect your restaurant from the city sewer system, effectively forcing a closure, or issue a stop-work order for new construction.
- Required and Costly Remediation: You become responsible for the full cost of cleaning any public sewer line blockages caused by grease from your establishment, which often involves specialized hydro-jetting and can cost thousands of dollars.
- Permit Revocation and Lease/Insurance Implications: A revoked permit can breach your commercial lease agreement and may void provisions in your property or business insurance related to sewer damage, leaving you personally liable for claims.
Legal code: Local sewer use regulations, water connection requirements, road/sidewalk ordinances, grease discharge limits
Recent update: As of 2026, Spokane has integrated grease interceptor permit reviews more closely with its overall plumbing and building permit process, requiring earlier submission during plan review for new construction.
Who Needs a Grease Trap/Interceptor Permit?
| Type | Required | Notes |
|---|---|---|
| Restaurant (Full-Service) | Required | Spokane Municipal Code (SMC) § 13.04.200 requires grease interceptors for facilities generating significant fats, oils, and grease (FOG). |
| Bar / Nightclub | Required | Required if the establishment has a food prep kitchen generating FOG, as per SMC § 13.04.200. |
| Food Truck | Not Required | Typically exempt under SMC § 13.04.200 as they use a holding tank (not a direct sewer connection), but must comply with separate mobile waste disposal rules. |
| Coffee Shop / Café | Required | Required due to food preparation (e.g., sandwiches, pastries) generating FOG, per SMC § 13.04.200. |
See which restaurant types need this requirement — and which don't.
See Full Requirements →Field-by-Field Guide (31 Fields)
26 of 31 auto-filledBusiness Legal Name
textEnter your business's exact, registered legal name as it appears on your Articles of Incorporation/Organization, Assumed Name Certificate, or business license with the Washington Secretary of State.
COMMON MISTAKE: Using a 'doing business as' (DBA) name instead of the registered legal entity name; misspellings or omitted suffixes like 'LLC' or 'Inc.'
Legal Entity Type
textEnter the official legal structure of your business, such as 'Limited Liability Company (LLC)', 'Corporation', 'Sole Proprietorship', or 'General Partnership'.
COMMON MISTAKE: Leaving blank or entering informal terms like 'restaurant' or 'family business'; misidentifying the structure (e.g., calling an LLC a corporation).
Wastewater Discharge Location
textEnter the complete physical street address of your restaurant where the grease interceptor is installed and wastewater discharges into the Spokane municipal sewer system.
COMMON MISTAKE: Providing a mailing address, P.O. Box, or corporate office address instead of the facility's exact discharge location; omitting the suite or unit number if applicable.
Type of Food Service Operation
textEnter the specific category of your food establishment, such as 'Full-Service Restaurant', 'Fast Food', 'Cafeteria', 'Bakery', or 'Catering Kitchen'.
COMMON MISTAKE: Using overly generic terms like 'food service' or 'restaurant'; inconsistency with the description used on your city business license.
NAICS Industry Classification Code
textEnter the correct 6-digit North American Industry Classification System code for your primary activity; for most restaurants, this is 722511 (Full-Service Restaurants) or 722513 (Limited-Service Restaurants).
COMMON MISTAKE: Using an outdated SIC code or an incorrect NAICS code for a different industry (e.g., retail); leaving the field blank.
Wastewater Discharge Sources
textList all kitchen fixtures and equipment that discharge wastewater into the grease interceptor, such as '3-compartment sink', 'pot sink', 'floor drains', 'dishwasher', and 'pre-rinse sprayers'.
COMMON MISTAKE: Omitting major sources like mop sinks or dishwashers; including sources that do NOT connect to the interceptor (e.g., restroom drains).
Types of Pollutants Discharged
textList the primary pollutants in your wastewater, focusing on fats, oils, and grease (FOG), along with food solids, soaps, and detergents.
COMMON MISTAKE: Listing non-applicable industrial chemicals or hazardous wastes; being overly vague (e.g., only 'grease').
Quantities of Pollutants
textProvide a realistic estimate of the average amount of FOG (in pounds per month) and total suspended solids (TSS) discharged, often based on your grease trap size and cleaning records.
COMMON MISTAKE: Leaving blank or entering 'unknown'; providing unrealistic estimates (e.g., '0 lbs' for a full-service kitchen) that trigger a review.
Average Daily Discharge Volume (gallons)
textEnter your estimated average daily wastewater flow in gallons, calculated from water meter readings, fixture flow rates, or seat-count formulas provided by the Spokane Wastewater Department.
COMMON MISTAKE: Providing peak volume instead of a daily average; underestimating volume, which can lead to an undersized interceptor designation and permit rejection.
Percentage of Waste Stream to Sewer
textEnter the estimated percentage of your total wastewater flow that enters the public sewer system versus other disposal methods (e.g., evaporation, hauling); for most connected restaurants, this is 100%.
COMMON MISTAKE: Entering a percentage less than 100% without a valid explanation (e.g., on-site treatment), which may require additional documentation and delay review.
ApronPrep auto-fills 26 of 31 fields from a single compliance interview — no re-typing, no guessing what the government expects.
Top 5 Grease Trap/Interceptor Permit Mistakes
1. Submitting a generic manufacturer cut sheet instead of Spokane-specific plans
Applicants often attach a manufacturer's generic specification sheet, which Spokane's Wastewater Management division rejects because it doesn't show the specific installation details required by local code (SMC 13.04). This mistake adds 2–4 weeks for plan review re-submission. Provide a detailed site plan showing the exact location relative to kitchen fixtures, sewer cleanout, and all piping dimensions, stamped by a licensed plumber if required for your trap size.
2. Incorrectly calculating the grease interceptor capacity (GPD)
Using the fixture count method wrong—like counting a three-compartment sink as one fixture instead of three—results in an undersized trap. An undersized trap violates SMC 13.04.515 and leads to a permit denial, requiring a full re-application with corrected hydraulic calculations. Follow the Spokane Wastewater Design Manual's formula: sum the grease-producing fixture volumes (in gallons) and multiply by the retention factor; for a standard restaurant, this typically requires a 750–1,500 gallon interceptor.
3. Listing a contractor without a current City of Spokane business license
The permit application requires the name and license number of the installing plumber. If the contractor's City of Spokane business license is expired or not listed, the application is put on hold until proof is provided, delaying issuance by 1–2 weeks. Verify the contractor's active license status on the City of Spokane Business License portal before submitting the application form.
Skip the Paperwork on Your Grease Trap/Interceptor Permit
ApronPrep auto-fills 26 of 31 fields from one compliance interview.
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Grease Trap/Interceptor Permit by City in Washington
| City | Fee Range | Timeline |
|---|---|---|
| Seattle | ||
| Spokane | ||
| Tacoma |
Timeline: Varies
Complete Industrial Pretreatment Survey to determine discharge classification
Download and complete the city's official Industrial Wastewater Survey form to detail your facility's operations, water usage, and waste streams. You'll need your facility's Standard Industrial Classification (SIC) or NAICS code, which dictates discharge limits. This step is required for all food service establishments and typically takes 1-2 hours of detailed record review.
Identify wastewater discharge sources and pollutant types at your facility
Create a process flow diagram listing all grease-generating points: kitchen drains, dishwashing stations, floor drains, and equipment wash-down areas. You must specify the estimated volume and concentration of fats, oils, and grease (FOG). Missing a major source, like a mop sink, is a common reason for application rejection and re-submission.
Determine if your business qualifies as Domestic Discharger, Minor Industrial User, or Significant Industrial User
Based on your survey data, the City of Spokane Wastewater Department will classify you, which dictates permit requirements. Key thresholds include discharge volume (exceeding 25,000 gallons/day) and pollutant concentration. Your classification determines subsequent fees and reporting obligations, so review the city's Wastewater Control Ordinance § 17C.130.040 carefully.
Where to Apply
Applications are handled by your local department of public works (dpw) in each city. Select your city below for authority details, fees, and processing timeline.
Other Requirements You'll Need
This is one of 13 requirements for opening a restaurant in Washington.
ADA Compliance Self-Certification
federal
Alarm System Permit/Registration
local
Annual Report Filing
state
Application for Employer Identification Number
federal
See all co-required forms and how they connect to your compliance dossier.
See All RequirementsProcessing time varies significantly, according to the Spokane Public Works - Wastewater Management Division. The timeline depends on application completeness, the need for plan review for a new interceptor, and the city's inspection schedule. For simple maintenance renewals, it may be a few weeks, but installations requiring a Building Permit can extend the process by several months.
According to the City of Spokane's current fee schedule, there is no direct government filing fee for the permit itself. However, fees are charged for required inspections and plan reviews, and failing an inspection results in re-inspection fees. This process is separate from your establishment's general City Business License/Registration fees. Not legal advice — verify current costs with Spokane Public Works.
No, grease trap/interceptor permits in Spokane are site-specific and do not transfer to a new address. The design and capacity of an interceptor are based on a specific facility's plumbing and food service operations. You must apply for a new permit at the new location, which will likely require submitting new plans and passing an initial inspection.
Spokane requires annual renewal for this permit to ensure ongoing compliance with the Spokane Municipal Code. Renewal involves submitting maintenance records, typically from a licensed hauler, and paying any associated annual inspection fees. The city sends a renewal notice, but it is the owner's responsibility to complete it on time to avoid enforcement actions.
A city inspector verifies that the installed unit matches approved plans, is the correct size and type for your establishment, and is properly connected to the sanitary sewer. They check for proper maintenance access, venting, and that the unit is not bypassed. The inspection is pass/fail; failure requires correction and a paid re-inspection, delaying your ability to operate.
About This Data
This guide is generated from ApronPrep's compliance dossier system, which uses 53 parallel AI authority experts to discover requirements, then downloads actual forms and generates field-level intelligence for each one.
For Washington specifically, we have analyzed compliance dossiers for 3 cities (Seattle, Spokane, Tacoma), generating Rich FILs (Form Intelligence Layers) with 31 form fields analyzed for this requirement. Fee data is sourced from actual county department fee schedules, not estimates.
Our data is verified against official government sources and updated when regulatory changes are detected. If you find an error, please report it — accuracy is our core commitment.
Sources
- Local sewer use regulations, water connection requirements, road/sidewalk ordinances, grease discharge limits
- Seattle — Department of Public Works (DPW)
- Spokane — Department of Public Works (DPW)
- Tacoma — Department of Public Works (DPW)
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