Fats, Oils & Grease

Clogged pipes are no fun for anyone. They can cause sewer backups into your home, and it can be hard work to get the pipes clean and flowing again.

Fats and oils can build up inside pipes and over time restrict wastewater flow, if they're poured down the drain. This could cause sewer blockages that can result in backups into your home or overflowing manholes. That's why it's so important to keep the grease out. To do that, both residential and commercial customers have key roles to play in following WSSC Water's Fats, Oils and Grease (FOG) Permit Program.

FOG Permit Program

All Food Service Establishments (FSEs) must apply for a WSSC Water FSE FOG Wastewater Discharge Permit via the WSSC Water ePermitting site. Once on this site, follow these instructions: 

• Select the Help tab in the black ribbon at the top of the site.
• Select the ePermitting Help & Information option.
• The ePermitting Help & Information section provides a list of ePermitting Quick Reference Guides (QRG) to assist you in registering your company for the ePermitting account and a guide to apply for the FSE FOG Wastewater Discharge Permit.

All FSEs also must apply for a health department license from the county of their location: Montgomery County or Prince George's County This includes establishments such as restaurants, cafeterias, grocery stores, hotel kitchens, church kitchens, school kitchens, bars or any other commercial or industrial operation that discharges wastewater into WSSC Water’s sanitary sewer system.

What Commercial Customers Can Do

WSSC Water has partnered with the Restaurant Association of Maryland and other agencies to help the food service industry determine best practices for disposing of FOG. As with residential customers, the #1 rule is to keep FOG out of the plumbing system in the first place. These additional tips will help to greatly reduce the amount of FOG entering the sewer system:

• Train all kitchen staff on the best grease disposal practices to follow.
• Do not pour, scrape or otherwise dispose of FOG into sinks or drains.
• Post “NO GREASE” signs near sinks and drains.
• After pumping out grease abatement devices and interceptors, inspect them to be sure they were adequately cleaned.
• Store used fryer oil in barrels for recycling.
• Dump mop water only into drains connected to your grease treatment system.
• Use absorbents to soak up spills containing FOG.
• Do not put food (including liquid food) down the drain. That includes milkshake syrups, batter and gravy.
• Use strainers on sinks and floor drains to prevent solid material from entering the sewer.
• If you have an automatic grease recovery device, empty the collection pan before it becomes full.
• Wastewater generated by cleaning duct filters or range filters must be routed through the grease treatment system.
• Regularly train all employees on the proper disposal of FOG.

Inspections

All FSEs are subject to annual inspections, and may be inspected at any time in response to complaints or reports of sewer blockages. During an inspection, WSSC Water Investigators will verify that all required fixtures are connected to an adequately sized grease treatment device, and will review maintenance records or other documents as necessary.

Annual Fees

Established in 2007, annual FOG fees are billed only through the WSSC Water and Sewer account associated with the FSE and, therefore, not necessarily to the FSE’s location address. This ensures the fee is paid in a timely manner and is associated with the sewer service connection provided to the property owner/account holder. Fees are properly invoiced so that the property owner/account holder can have the option to collect the fee from their tenant if they wish.

NOTE: Effective July 1, 2025, the Annual Discharge Fee for a Full Permit FSE is $745 and the Annual Discharge Fee for a Best Management Practices (BMP) Permit FSE is $220. Discharge Fee for a Full Permit is for FSEs that are required to have grease abatement devices. Discharge Fee for a BMP Permit is for FSEs that are required to have a FOG Discharge Permit but are not required to have a grease abatement device.

Enforcement

When one experiences non-compliance issues, we have several workable solutions within our Enforcement Response Plan (PDF 492 KB). Failure to comply with any condition of an FSE permit can result in penalties that include fines up to $1,000 or termination of water and sewer service.

What You Can Do at Home

The best way for residential customers to help: Don't pour FOG down the drain. That's sure to cause clogs, possible sewer backups into your home and sewage overflows in the WSSC Water system. So do your part by properly disposing of FOG:

• Pour the oil or grease into a can.
• Put a lid on the can.
• Cool the can of grease in the refrigerator.
• When it's full, toss the can into the trash.
• Be sure the can is covered so that if the grease melts, it does not spill into your trash.

Just remember: To keep the grease out, "Can it. Cool it. Toss it." 

Visit our Can the Grease page to learn more and to request a can lid to help you dispose of fats, oils and grease properly.  

Contact Us

Contact the FOG Staff

Related Links

• Licensed Haulers (updated February 2, 2026)
  (PDF 181 KB)
• FSE Permit Numbers by Name & Address (updated December 2025)
  (PDF 1.57 MB)
• Responding to a Grease Violation for FSE Owners
  (PDF 27.8 KB)