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Grease Trap Pumping in Michigan

Avg. $200 - $800 · Every 1-3 months for restaurants

Cities

$200 - $800

Avg. Cost

Grease trap pumping is a critical maintenance service for restaurants, commercial kitchens, food processing facilities, and any business that discharges fats, oils, and grease (FOG) into its wastewater. Grease traps (also called grease interceptors) capture FOG before it enters the sewer system or septic tank, where it would cause devastating clogs and backups. Local health codes and environmental regulations typically require grease traps to be pumped when the combined grease and solids layer reaches 25% of the trap's capacity — for busy restaurants, this often means pumping every 1 to 3 months. During service, a vacuum truck removes all contents from the trap, including the floating grease layer, settled food solids, and wastewater. The technician will scrape the trap walls, inspect baffles and flow restrictors, and verify the trap is functioning correctly before refilling with clean water. Failure to maintain grease traps can result in sewer backups, foul odors, health department citations, fines of $1,000 or more per violation, and even forced closure. Many jurisdictions require businesses to maintain a pumping log and produce records during health inspections. Professional grease trap services often include manifesting and proper disposal of collected waste at approved facilities.

Michigan Regulations for Grease Trap Pumping

Michigan regulates onsite septic systems primarily through local county or district health departments under the authority of Part 117 of Michigan's Public Health Code (MCL 333.12751). The Michigan Department of Environment, Great Lakes, and Energy (EGLE) provides oversight, publishes technical guidance, and enforces requirements in counties that lack their own programs. A soil evaluation and a construction permit issued by the local health department are required before installation. Michigan is one of the few states without a unified statewide septic code — each county adopts its own rules, creating significant variation in setback requirements, system types allowed, and inspection schedules. EGLE's Part 31 Water Resources Protection rules add requirements for systems near the Great Lakes shoreline and inland lakes. Setback requirements commonly range from 50 to 150 feet from surface water depending on county. Michigan enacted the Septage Waste Servicer Licensing Act (PA 247) to regulate pumpers statewide.

Licensing Requirements

Michigan licenses septic system installers through the Michigan Department of Licensing and Regulatory Affairs (LARA) under the Sewage Disposal System Contractors Licensing Act (PA 139). Installers must pass a written examination, demonstrate two years of field experience, and carry liability insurance of at least $100,000. Septage waste servicers (pumpers) are licensed by LARA under PA 247 and must meet vehicle equipment standards and maintain manifests for every haul. Soil evaluators working for county health departments are typically certified sanitarians. Engineers designing advanced systems must hold a Michigan PE license. Continuing education requirements vary by county program.

Environmental Considerations

Michigan's glacial history created extremely diverse soil conditions across the state's Lower and Upper Peninsulas. Sandy outwash soils in the northern Lower Peninsula and the Upper Peninsula have high permeability but low natural filtration capacity, risking rapid pathogen transport to groundwater. Lacustrine clay deposits near the Great Lakes shoreline and in river valleys create low-permeability conditions requiring engineered alternatives. The high water table in many lakeshore communities — particularly along Lakes Michigan, Huron, and Erie — severely constrains conventional drainfield depth. Michigan's 11,000 inland lakes and thousands of miles of streams create extensive setback-restricted areas. PFAS groundwater contamination in several counties has heightened regulatory scrutiny of all groundwater impacts including septic systems.

Signs You Need Grease Trap Pumping

Slow drains in the kitchen, especially floor drains and sink drains
Foul odors coming from drains or the grease trap area
Grease visible in the trap when the lid is opened
Health department notice or citation for trap maintenance
Grease backup into sinks or onto the floor
It has been more than 90 days since the last pumping

The Grease Trap Pumping Process

1 Access the grease trap and remove the lid for inspection
2 Measure the grease and solids accumulation levels
3 Pump out all contents — grease, solids, and wastewater — with a vacuum truck
4 Scrape trap walls, baffles, and lid to remove adhered grease
5 Inspect baffles, flow control devices, and trap integrity
6 Refill with clean water, document the service, and provide compliance records

Frequently Asked Questions — Grease Trap Pumping in Michigan

How often does a grease trap need to be pumped?

The industry standard is the 25% rule: pump when combined grease and solids reach 25% of trap capacity. For most restaurants, this means every 1-4 weeks for small under-sink traps (20-50 gallons) and every 1-3 months for large exterior interceptors (1,000-2,000 gallons). Many jurisdictions mandate pumping at least every 90 days regardless of accumulation levels.

How much does grease trap pumping cost?

Costs depend on trap size: small under-sink traps (20-50 gallons) cost $75-$250 per pumping, medium exterior traps (200-500 gallons) cost $150-$400, and large interceptors (1,000-2,000 gallons) cost $300-$800. Scheduled service contracts reduce per-visit cost by 20-35% compared to on-demand calls. Annual grease trap maintenance for a typical restaurant runs $2,000-$6,000.

What happens if I do not pump my grease trap?

Neglected grease traps cause sewer line blockages, foul odors, health department citations ($250-$10,000 per violation), potential temporary closure orders for repeat violations, and sewage backups into your kitchen. For restaurants on septic systems, grease entering the tank causes accelerated scum buildup, outlet blockage, and premature drain field failure ($10,000-$25,000 to replace).

Do I need a grease trap if my restaurant is on septic?

Absolutely — and sizing should be more generous than minimum requirements. Grease that bypasses or overwhelms the trap enters your septic tank, where it accumulates faster than bacteria can break it down. This leads to scum layer buildup, blocked baffles, and grease reaching the drain field where it permanently clogs soil pores. Restaurants on septic should also pump their septic tank annually rather than the standard 3-5 years.