Grease Trap Regulations in Maine

Overview

Maine food service kitchens must follow fats, oils, and grease (FOG) pretreatment rules. The Maine Department of Environmental Protection (DEP) sets the state framework. Local water and sewer districts handle most of the day-to-day enforcement. The Greater Augusta Utility District operates under the Maine Pollutant Discharge Elimination System (MEPDES) Permit. The Maine DEP issues that permit. Maine has held NPDES program primacy since 2001, with U.S. EPA oversight. Local utilities and sewer districts set the specific interceptor sizing, cleaning schedules, and record-keeping rules that protect city wastewater plants.

Governing Authorities

The Maine DEP protects and restores the state's natural resources and enforces state environmental law. Day-to-day FOG enforcement falls to local water and sewer districts. Major enforcement bodies include:

• Maine Department of Environmental Protection (state-level oversight and permitting)
• City of Portland Department of Public Works, Water Resources Division (Portland FOG pretreatment program — "Cut Through the FOG")
• Greater Augusta Utility District (Augusta-area grease trap standards)
• Bangor-area municipal sewer authorities
• Local Code Enforcement offices (building permits and grease interceptor installation)
• Maine Department of Health and Human Services (food service licensing)

All food service kitchens must submit a Grease Trap/Interceptor Application to their local district. This includes bakeries, restaurants, motels, hotels, cafeterias, hospitals, schools, bars, fish markets, and coffee shops. In short, any kitchen that needs a State of Maine Department of Health and Human Services food service license.

Key Requirements

Maine food service businesses must meet FOG pretreatment rules under the Maine Department of Environmental Protection (DEP) and local sewer districts. The City of Portland Department of Public Works, the Bangor Wastewater Treatment Plant (run by Bangor Public Works), and other local utilities require interceptor installation, routine maintenance, and saved service records.

Grease Interceptor Installation

• Install a properly sized grease interceptor or trap based on kitchen output and fixture flow rates.
• Standards cover the location, design, installation, construction, operation, and maintenance of new and existing grease traps and interceptors. Units must meet federal, state, and local discharge rules.
• Interceptors must stay accessible for inspection and maintenance.
• Hydromechanical grease interceptors (HGIs) usually handle 20 to 50 gallons per minute.
• Gravity grease interceptors (GGIs) range from 1,000 to 4,000 gallons for larger kitchens.

Cleaning Frequency and Maintenance

• Clean grease interceptors when FOG and solids reach 25% of tank capacity.
• Small interior grease traps (under 100 gallons): usually every 1 to 3 months.
• Large exterior grease interceptors (1,000+ gallons): quarterly, or when 25% full — whichever comes first.
• High-volume kitchens may need monthly cleaning.
• Run weekly inspections at first, until you have enough data to set the right cleaning schedule.

Record-Keeping Requirements

Keep manifests from certified waste haulers for three years. Make them available on inspection. Food service kitchens must keep:

• Grease trap cleaning logs with dates, service provider details, and volume removed.
• Waste hauler manifests showing disposal at approved facilities.
• Inspection records that document trap condition and FOG levels.
• All records on-site and ready for inspection for at least three years.
• Many Maine cities now require electronic reporting through online portals.

Fines and Enforcement

Failing these standards breaks the local Sewer Use Ordinance. Penalties may include denial or shutoff of water and sewer service. Specific fine amounts vary by city, since local water districts set their own enforcement schedules.

Enforcement actions may include:

• Written notices of violation requiring corrective action within set timeframes (usually 10 to 30 days).
• Daily fines for continued non-compliance (amounts vary by city).
• Suspension or revocation of discharge permits.
• Shutoff of water and sewer service for repeat violations.
• Recovery of costs for sewer line cleaning or repair caused by FOG discharge.
• Referral to Maine DEP for state-level enforcement.

Owners can be liable for damage to city sewer systems. That includes blockage cleanup costs and damage to neighboring properties from sewage backups. Maine cities may also charge higher sewer rates or "extra strength charges" on kitchens that discharge high-FOG wastewater without proper pretreatment.

Major City FOG Programs

Portland

The City of Portland runs one of Maine's most complete FOG management programs. In January 2012, the city launched Cut Through the FOG. The program added new requirements and phased in new sewer rates for all food service kitchens. Cut Through the FOG requires that all FOG conveyance lines connect to grease interceptors in every Portland food service kitchen during new construction, redevelopment, tenant improvement, or change in ownership or occupancy. Portland requires kitchens to join the Preferred Pumper Program. The program standardizes cleaning steps and automates compliance reporting. Most interceptors must be cleaned when they reach 25% full of FOG and solids. Some high-efficiency HGIs can run up to 75% full. The Bureau of Environmental Services runs regular inspections and can issue citations for poor maintenance. Portland bans chemical additives, enzymes, and emulsifiers in grease interceptors.

Augusta

The Greater Augusta Utility District (GAUD) runs strict Grease Trap & Interceptor Standards with penalties for non-compliance. Every food service kitchen must submit a grease trap application and maintain interceptors to district standards. Every kitchen with a State of Maine food service license must register its grease interceptor with the district. Augusta stresses proper sizing, installation, and regular maintenance to protect the city sewer system. The district runs periodic inspections and reviews manifests.

Bangor

The Bangor area requires grease interceptor compliance as part of its city wastewater program. The Code Enforcement Office handles compliance with grease trap rules. It works with the Maine DEP. Bangor provides grease trap log forms for kitchens to record maintenance. Food service businesses must contact Code Enforcement for plumbing permits tied to interceptor installation or modification. The city enforces the 25% rule and requires regular pumping by licensed septage haulers with disposal records.

Biddeford and Westbrook

Both Biddeford and Westbrook have run grease trap cleaning and inspection programs in recent years. They require food service kitchens to set cleaning schedules that match their production volume. Most kitchens fall into a monthly to quarterly service window. Licensed waste haulers must provide manifests showing disposal at approved treatment facilities. Local enforcement aims to prevent sewer blockages and keep wastewater plants running.

Frequently Asked Questions

How often do I need to clean my grease trap in Maine?

It depends on interceptor size and grease load. The standard rule is to clean when FOG and solids reach 25% of tank capacity. Small interior traps (under 100 gallons) usually need cleaning every 1 to 3 months. Larger exterior interceptors need quarterly service, or sooner if they hit the 25% mark. High-volume restaurants with heavy frying may need monthly cleaning. Your local water district may set minimum cleaning frequencies. Portland and many other Maine cities require the 25% rule and use of certified pumpers who report service straight to regulators. Keep detailed logs and hauler manifests for at least three years.

What records do I need to keep for grease trap compliance in Maine?

Maine rules require full grease interceptor records for at least three years. Keep cleaning logs with the date of service, the licensed pumping company's name, the volume removed, and the trap's condition. Keep waste hauler manifests showing disposal at approved facilities. Many Maine cities now require electronic submission through online portals. Keep inspection records that show FOG levels as a percentage of tank depth. During health department or water district inspections, you can be cited for missing records, even if the trap is in good shape.

Can I use chemical additives or enzymes in my grease trap in Maine?

No. Most Maine cities, including Portland and Augusta, ban chemical additives, biological agents, enzymes, or surfactants that emulsify grease in interceptors. These products do not eliminate grease. They break it into smaller particles that pass through the trap. The grease can then block the sewer or disrupt the wastewater plant. Maine water districts require physical removal by a licensed waste hauler. Use only cleaning products approved by your local sewer district. A well-kept interceptor does not need additives. Banned additive use can result in fines and may make you liable for downstream sewer damage.

Find Grease Trap Service in Maine

GreaseTrapLocator.com lists 15 certified grease trap service providers across Maine. These licensed pros offer pumping, cleaning, inspection, and maintenance for kitchens of all sizes, from small cafés to large institutional kitchens. Many Maine providers join regional Preferred Pumper programs and offer automated compliance reporting that meets city documentation rules. Whether you operate in Portland, Bangor, Augusta, or elsewhere in Maine, our directory connects you with qualified septage haulers who know state DEP rules and local sewer district standards. Find providers near you at our Maine grease trap services directory.