Grease trap guide for people entering the paper path

Last updated 2026-08-21

What is a grease trap?

A grease trap is a plumbing tank that holds kitchen wastewater long enough for fats, oils, and grease (FOG) to cool and separate before the water goes to the sewer. Grease floats. Food solids sink. The middle water leaves through an outlet baffle or tee.

That is the device. Everything else is paper and pumping.

People use grease trap as a street name for several boxes. A small hydromechanical interceptor often sits under a sink and is rated in gallons per minute. A gravity grease interceptor sits outside in the ground and is rated in gallons. Automatic grease removal devices skim FOG with a mechanical scraper. Inspectors will still say trap while pointing at a 1,500 gallon vault.

FOG is not a housekeeping preference. It is a collection-system pollutant. When grease cools inside a sewer it sticks to the pipe wall, catches solids, and closes the pipe. The U.S. Environmental Protection Agency told Congress that grease was the most commonly reported cause of sanitary sewer overflow blockages, at 47 percent. ^[12]

Federal law already bans the outcome. 40 CFR 403.5(b)(3) prohibits "Solid or viscous pollutants in amounts which will cause obstruction to the flow in the POTW resulting in Interference." ^[1] POTW means the public treatment works, the plant plus the pipes.

If you cook food for customers, local plumbing code and the sewer utility usually make you install a grease trap. The FDA Food Code, the model most health departments start from, says a grease trap, if used, "shall be located to be easily accessible for cleaning." ^[4]

Cannot open the lid? You do not have a working grease trap. You have a future backup.

How do you start grease trap work?

You start grease trap work by choosing your side of the lid. Kitchens install and maintain interceptors. Haulers pump them and move brown grease to a legal outlet. The forms are different. Do not mix the two checklists.

For a food site, call the plumbing inspector and the POTW pretreatment desk before you buy steel. Ask what type they will accept, who is allowed to size it, and whether you need a FOG discharge permit on top of the plumbing permit. Then use a licensed plumber. A box from a catalog that the city will not pass is scrap.

For a pumping business, find the state board that registers liquid-waste, septage, or sludge transporters. Names vary. There is no national grease trap hauler card. 40 CFR Part 403 puts pretreatment duties on POTWs and on industrial users. ^[2] It does not license your truck.

Lock disposal next. Renderers, some anaerobic digesters, and some treatment plants take brown grease. Storm drains, ditches, and random dumpsters do not. I would not buy a vacuum truck until I had a written place to take the load.

After that, the stack is dull and mandatory. Form the entity. Get an EIN. Talk to an insurer who has actually written waste-hauling auto and pollution coverage. Build driver files, a tank-wash plan, and a manifest system. Confirm fees and forms with the issuing board. Do not trust a blog for a current dollar amount or a processing clock.

If you already know the state, skip the myth and read a state paper path. Start with how to start grease trap in Alabama or how to start grease trap in California. Alaska is a different truck and a different board. See how to start grease trap in Alaska.

What is the difference between a grease trap and a grease interceptor?

A grease trap and a grease interceptor do the same physics job. Codes and manufacturers treat interceptor as the broader, more accurate word. Trap is what cooks and many inspectors still say. Do not fight the vocabulary on a job site. Fight the sizing and the lid access.

Hydromechanical units are compact. They use baffles and short retention time and are often listed to ASME A112.14.3 or PDI G101. Gravity interceptors are large in-ground tanks. They use volume and time. The International Plumbing Code puts both under Chapter 10, Traps, Interceptors and Separators, and requires grease-laden kitchen fixtures to drain through an interceptor where the code official requires it. ^[6]

Kind	Where it usually sits	How it is rated	Who typically services it
Hydromechanical interceptor	Indoors, near the sink	Gallons per minute	Kitchen staff or a hauler
Gravity interceptor	Outside, in-ground	Gallons of volume	A vacuum-truck hauler
Automatic grease removal device	Indoors, on the waste line	Flow plus skimmer cycle	Staff, plus periodic haul-off

I would not let a vendor upsell a huge indoor unit that the health department cannot open. The Food Code accessibility rule is not optional once the device is used. ^[4] Outdoor gravity tanks fail in a different way. They fail when the traffic lid gets paved over.

If a salesperson swears one brand is federally required, ask them to name the section. They usually cannot. IPC Chapter 10 and the adopted local amendments are what the inspector will hold in their hand. ^[6]

Who regulates grease traps in the United States?

Grease traps sit under a pile of agencies, not one. That is why national one-license ads are a myth.

The Clean Water Act authorizes pretreatment standards. 33 U.S.C. § 1317 is the statute. ^[7] EPA wrote the General Pretreatment Regulations at 40 CFR Part 403. ^[2] Those rules tell POTWs to keep industrial and commercial pollutants from wrecking the plant or passing through to waters. EPA's introduction to the National Pretreatment Program walks through that local-program structure. ^[3]

Large POTWs have to run pretreatment programs under 40 CFR 403.8. ^[10] That is why your city has a FOG coordinator with an ordinance, a grease interceptor detail, and the power to fine a restaurant.

Plumbing installation is a different desk. Most cities adopt the International Plumbing Code or the Uniform Plumbing Code. IPC Chapter 10 is the interceptor chapter in IPC jurisdictions. ^[6] The health department adopts some edition of the FDA Food Code and looks at cleaning access and vermin. ^[4]

Hauling is usually a state environmental or health credential. OSHA covers the worker who opens the tank. ^[5] Highway tank and waste rules can also attach to the truck. Confirm the exact mix with counsel and the board. I am not your lawyer.

Nobody at EPA mails you a grease trap sticker for a taco shop. The federal role is the prohibition and the pretreatment program duty. The permit you actually hang on the wall is local or state.

What paper do restaurants need for a grease trap?

Food sites need local paper, not a federal interceptor license. Start with a plumbing permit and an approved drawing. Many POTWs also issue a FOG or wastewater discharge authorization for food service establishments. Ask. Do not assume the plumbing permit covers the sewer side.

The install package is usually a site plan, interceptor cut sheets, drainage fixture calculations or a volume sizing sheet, and, after the pour, an inspection and as-built. Keep those. The next inspector will ask.

Once the tank is in, the living paper is the cleaning log. Cities want the date, the gallons, the hauler name, and a receipt that matches a licensed transporter. If your hauler is a guy with a truck and no ticket, you will lose that argument.

The Food Code line is short on purpose. If used, a grease trap "shall be located to be easily accessible for cleaning." ^[4] Indoor units buried behind a water heater fail that test. Outdoor units with a paver patio poured over the lid fail it too.

Some cities require an annual FOG registration. I will not quote a number because those fees move. Confirm with the pretreatment office that actually bills you.

If you are comparing state paths for more than one store, read grease trap license in Alabama next to grease trap license in California. The steel looks the same. The form names do not.

What licenses do you need to pump grease traps?

You need whatever liquid-waste or sludge-transporter credential your state issues, plus local business and vehicle paper. You do not get a single EPA grease trap operator license. 40 CFR 403 governs pretreatment programs. ^[2] It is not a hauler card.

Typical stack, in plain order: form a legal entity, get an EIN, register as a waste transporter or septage and grease hauler with the state environmental or health board, title and insure the vacuum truck, pass any tank or vehicle inspection the board runs, and sign a disposal contract. Some counties add their own liquid-waste registrations on top.

Confirm the application, the fee, and the renewal cycle with that board. I will not invent a processing time. Boards change portals and they change prices.

Driver files matter. So does knowing whether your state treats brown grease as septage, special waste, or industrial wastewater. The label changes the outlet.

Arizona paper is not Alabama paper. If Arizona is home base, use grease trap license in Arizona. For board-level Alabama notes, see grease trap board in Alabama.

Manifests are how you prove a load left the kitchen and arrived somewhere legal. If you want interceptor and manifest templates in one packet, GreaseTrapPath sells a $199 one-time Interceptor + Manifest Kit at /start. It is paper, not a permit. This site is not a law firm and not a pumping company.

Skip paid national certifications unless your board names that course. Most do not. That money is usually better spent on hose, a spare pump, and a lawyer who has read your state transporter rule.

How often do you pump a grease trap?

Pump it before FOG and settled solids take over the tank. Many city FOG ordinances use a 25 percent rule. When the combined grease cap and bottom solids equal 25 percent of the wetted depth, it is due. Some cities write 90 days. Some write 30 or 60 for heavy kitchens. Confirm the ordinance. Do not guess from a video.

The 25 percent idea exists because a full interceptor stops separating. Incoming flow punches through the grease mat and out the effluent tee. You paid for a tank that is now a pipe.

I would measure, not sniff. A sludge judge or core sampler tells you the layers. Smell tells you that you are already late.

Heavy fryer lines and hotels with banquet kitchens go shorter. A sandwich shop with almost no grill may go longer if the city allows it. The permit wins over the vendor sticker on the lid.

Additives that emulsify grease so it flows away are often banned by the same FOG program that required the tank. They do not make FOG disappear. They move it into the sewer you are trying to protect. I would not spend money there.

Keep every pump ticket. Pretreatment inspectors ask for a year of them. EPA's FOG fact sheet for food service establishments exists because those discharges keep showing up in collection-system problems. ^[8]

What happens to grease trap waste after you pump it?

After you pump a grease trap you have brown grease, a mix of FOG, food solids, and water. It goes to a facility that is allowed to take it. That is usually a renderer, a brown-grease processor, an anaerobic digester, or a POTW that publishes acceptance rules.

It does not go in a storm drain. It does not go on a back lot. It does not go in the restaurant dumpster to leak onto the pad.

Yellow grease is different. That is used fryer oil, often stored in a dedicated bin and sold to a renderer. Keep yellow and brown apart. Mixed loads get rejected. You then own a tank of waste with no home.

If someone land-applies a grease and septage blend, 40 CFR Part 503 (sewage sludge use and disposal) can enter the picture. ^[9] Many haulers never go that route and never should without knowing the rule. I would stay with a permitted plant and a ticket.

Typical restaurant grease trap waste is not a listed hazardous waste under 40 CFR Part 261. ^[11] Do not use that as an excuse to dump it. Non-hazardous is not the same as unregulated. State transporter rules and local discharge bans still apply.

Ask the outlet what they reject. Solvents, mop chemicals, and wipes show up in interceptors that also catch fixtures they should not.

How much does grease trap work cost in year one?

Costs split into two piles: installing a grease trap at a food site, and standing up a hauling route. There is no honest national price tag I will print as if it were a fee schedule.

For kitchens, the box itself is only part of it. Excavation, traffic-rated lids, sampling tees, indoor reroutes, and lost parking often dwarf the tank invoice. Small indoor hydromechanical units cost less to buy and more in weekly cleaning labor. Large gravity tanks cost more to set and less per gallon to pump if the route is dense. Confirm numbers with local plumbers and the AHJ. Anyone quoting a single U.S. average is selling.

For haulers, the real money leaves through the truck, insurance, disposal tipping, fuel, wash water, and deadhead miles. Board application fees exist and they change. Confirm them on the current fee page. I will not invent one.

Waste of money in year one: a second truck before you have a second day's work, enzyme programs, unrequired national certificates, and a cheap tank with no baffles that the inspector fails. Also a bargain dump site that disappears in month four.

Colorado and other mountain states add winter access you will not see in a Gulf Coast pro forma. If that is your map, read how to start grease trap in Colorado before you price a route.

What safety rules apply when you open a grease interceptor?

Opening a grease interceptor can put you in a confined space. OSHA's permit-required confined space rule is 29 CFR 1910.146. ^[5] The definition is blunt. A confined space is large enough to enter, has limited entry or exit, and is not designed for continuous occupancy.

In-ground gravity interceptors meet that test if a person goes in. Atmosphere hazards are real. Hydrogen sulfide, low oxygen, and engulfment in sludge have killed people in tanks that only needed a scrape.

I would treat every vault as a permit space until a competent person documents otherwise. Pump from grade. Use the hatch. Do not send a new hire down a ladder with a shovel and a headlamp.

If you do enter, you need the full 1910.146 program: atmospheric testing, an attendant, a rescue plan that is not we will figure it out, and training. ^[5] A restaurant manager is not your rescue team.

PPE for grade-level pumping is still a thing. Splash, infection risk from mixed wastewater, and bad footing on grease films. Get a tetanus story from any veteran pumper and you will wear gloves.

The Food Code wants access for cleaning. ^[4] Access for a vacuum hose is not the same as a designed human entry. Design the job so nobody has to climb in.

What records and manifests should you keep?

Keep paper that proves three facts: the tank was serviced, the waste went somewhere legal, and the person who hauled it was allowed to. That is the whole records system.

Restaurants should keep pump invoices, interceptor location photos, the original plumbing approval, and any FOG permit. Twelve months is a common ask. Some cities want more. Scan them. Wet tickets in a drawer under the fryer do not survive.

Haulers should keep a multi-part manifest or trip ticket: generator name and address, date, gallons, truck ID, driver, and receiving facility signature. Match that to disposal tickets and to your state transporter reports if the board requires periodic totals.

Training records, confined-space programs, and insurance certificates live in a separate binder. When a spill happens, nobody wants to hunt for a PDF.

EPA's pretreatment framework expects POTWs to have enforceable local limits and the files to back them up. ^[3] Your ticket is how a cafe proves it is not the source of the blockage on Main Street.

I keep digital and paper for a year one operation. Cloud only fails when the driver has no signal behind a strip mall. Name files by date and store number. Future you will not remember which Thursday it was.

What first-year mistakes waste money?

The expensive mistakes are predictable.

Starting a route with no written disposal outlet. You will fill a truck and then beg. Buying a used vacuum tank that cannot pass the state vehicle inspection. Hiring a cash driver and issuing no tickets, which then gets your restaurant accounts fined. Mixing yellow grease, brown grease, and septic in one tank just this once.

Kitchens have their own list. Paving over the lid. Connecting a dishwasher so hot that it blows grease through the interceptor. Using emulsifiers the FOG program banned. Choosing an indoor unit the health inspector cannot pull.

National myth is another cost. There is no secret federal quota. Nobody can publish a one-week approval that holds in every state. Confirm timing with the board. Anyone who sells you certainty is selling.

If you only read one state walk-through after this guide, make it the state where the truck is plated. Alabama operators can start with how to start grease trap in Alabama and the grease trap license in Alabama page. Do not copy Alabama forms onto an Arizona application.

Where do the state grease trap rules actually live?

State rules live in three places: the plumbing code the city adopted, the POTW FOG ordinance, and the state transporter statute. You need all three. A post that lists the one U.S. grease trap license is fiction.

Read the state guide that matches your first truck or your first store. How to start grease trap in Alabama and grease trap board in Alabama cover that board's paper. California, Alaska, Arizona, and Colorado each have their own start pages on this site.

GreaseTrapPath is an independent publisher. We are not a law firm and not a pumping company. If you want the Interceptor + Manifest Kit, it is a $199 one-time packet at /start. Still call the board. Still read the ordinance. The kit does not approve you.

Last check. If a claim in any guide is a fee, a quota, or a processing clock, treat it as stale until the board page says otherwise.

Frequently asked questions

What is grease trap?

A grease trap is a tank or interceptor that holds kitchen wastewater so fats, oils, and grease separate before the water reaches the sewer. Small indoor units are often hydromechanical. Large outdoor tanks are gravity interceptors. Federal pretreatment rules at 40 CFR 403.5 ban viscous FOG that can obstruct a POTW. Local plumbing and health rules decide who must install one.

How do you start grease trap?

Pick your side first. Kitchens get a plumbing permit, an approved interceptor, and a cleaning log. Haulers register with the state liquid-waste or sludge-transporter board, insure a vacuum truck, and sign a legal disposal outlet before the first pump. There is no national grease trap license. Confirm every form and fee with the board that issues it.

Is a grease trap the same as a grease interceptor?

Same physics, different jargon. Interceptor is the code word. Trap is the street word. Hydromechanical interceptors sit indoors and are rated in gpm. Gravity interceptors sit in the ground and are rated in gallons. IPC Chapter 10 covers traps, interceptors, and separators in cities that adopted that code. Inspectors will use both names on the same visit.

Do I need an EPA permit to pump grease traps?

No. EPA's 40 CFR Part 403 sets pretreatment duties on POTWs and industrial users. It does not issue a hauler card for brown grease. Your permit is almost always a state transporter or septage credential plus local business and vehicle paper. Confirm the exact name of the credential with the state environmental or health board.

What is the 25 percent rule for grease traps?

Many city FOG ordinances require pumping when floating grease plus bottom solids reach 25 percent of the tank's wetted depth. At that point the interceptor stops separating and grease leaves in the effluent. Other cities write a calendar rule such as 90 days. Measure with a core sampler. Confirm the trigger in the local ordinance, not on a vendor sticker.

Is grease trap waste hazardous waste?

Typical restaurant grease trap waste is not a listed hazardous waste under 40 CFR Part 261. That does not make it free to dump. States still regulate it as special waste, septage, or industrial wastewater. Mixing solvents or unknown shop chemicals into the tank can change the picture. Keep brown grease as a known food-waste stream and take it to a permitted outlet.

What is brown grease versus yellow grease?

Brown grease is what you pull from a grease trap: FOG, water, and food solids. Yellow grease is used fryer oil from a dedicated bin. Keep them apart. Renderers and plants often reject mixed loads. Yellow grease is usually a commodity. Brown grease is a waste you have to place. One tank for both is how you lose an outlet.

Can I put grease trap waste in a dumpster?

No. Brown grease leaks, smells, and violates most solid-waste and sewer rules. It belongs in a sealed vacuum truck going to a renderer, digester, or POTW that accepts it. Dumpster disposal also leaves the restaurant with no legal ticket when pretreatment asks for 12 months of receipts. That is how kitchens get fined after a blockage.

Do houses need grease traps?

Most homes do not. Grease trap rules target food service establishments with grease-laden fixtures. A house can still clog a sewer with FOG, which is why cities run public FOG campaigns. Some mixed-use buildings or home kitchens used as licensed food businesses get pulled into the commercial rule. Ask the local plumbing and pretreatment desks if the use is commercial.

How is a grease interceptor sized?

The authority having jurisdiction decides the method. Hydromechanical units are often sized by flow rate and fixture load under the adopted plumbing code. Gravity tanks are often sized by volume using drainage fixture units or a local FOG formula. I would not order a tank from a catalog before the AHJ names the method. A failed size is expensive concrete.

Who inspects grease traps at a restaurant?

Usually more than one desk. The plumbing inspector looks at the install. The health department looks at access and sanitation under the Food Code model. The POTW FOG or pretreatment staff look at pumping records, effluent, and ordinance limits. A hauler may also refuse a tank that is unsafe to open. Keep one file that all three can read.

What insurance do grease trap haulers usually carry?

Talk to a carrier that already writes waste and vacuum-truck risks. The usual conversation is commercial auto, general liability, and pollution or environmental liability for spills. I will not invent a limit or a premium. Those numbers are underwriting, not a blog fact. Ask what the disposal plant and your state transporter board want to see on a certificate.

How long does a grease trap hauler license take?

No honest source publishes a single clock that fits every state. Some boards are a form and a vehicle inspection. Others add training, bonding, or background checks. Processing times change when portals change. Confirm the current steps and any posted timeline with the issuing board. Do not plan a first route on a salesperson's one-week promise.

Can I use enzymes instead of pumping a grease trap?

I would not. Many FOG programs ban emulsifiers and enzyme additives because they push grease downstream instead of removing it. The tank still fills with solids. Pretreatment still wants a pump ticket from a licensed hauler. Spend the money on measured pumping and a legal outlet. If an additive is allowed at all, it is on top of pumping, not instead of it.

Sources

1. eCFR 40 CFR 403.5 National pretreatment standards: Prohibited discharges: 40 CFR 403.5(b)(3) prohibits solid or viscous pollutants in amounts that will cause obstruction to POTW flow resulting in Interference.
2. eCFR 40 CFR Part 403 General Pretreatment Regulations: 40 CFR Part 403 is the federal General Pretreatment Regulations for POTWs and industrial users.
3. EPA Introduction to the National Pretreatment Program (2011): EPA's 2011 introduction explains how local pretreatment programs implement federal prohibited-discharge and local-limit duties.
4. FDA Food Code 2022, Section 5-402.12 Grease Trap: FDA Food Code 5-402.12 requires that if a grease trap is used, it shall be located to be easily accessible for cleaning.
5. OSHA 29 CFR 1910.146 Permit-required confined spaces: 29 CFR 1910.146 sets the confined-space definition and permit-space duties that apply when a person enters an interceptor vault.
6. ICC International Plumbing Code 2021 Chapter 10 Traps, Interceptors and Separators: IPC Chapter 10 is the interceptor and separator chapter used in IPC-adopting jurisdictions for grease-laden waste.
7. 33 U.S.C. § 1317 Toxic and pretreatment effluent standards: Clean Water Act section 1317 authorizes federal pretreatment standards implemented through EPA and approved state programs.
8. EPA Report to Congress on the Impacts and Control of CSOs and SSOs (2004): EPA's report to Congress documents FOG as a leading cause of sewer blockages, supporting why food service establishments must control grease discharges.
9. eCFR 40 CFR Part 503 Standards for the Use or Disposal of Sewage Sludge: 40 CFR Part 503 can apply when grease-bearing wastes are managed with sewage sludge, including some land-application paths.
10. eCFR 40 CFR 403.8 Pretreatment Program Requirements: Development and Implementation by POTW: 40 CFR 403.8 requires certain POTWs to develop and implement pretreatment programs, which is why cities run FOG ordinances.
11. eCFR 40 CFR Part 261 Identification and Listing of Hazardous Waste: 40 CFR Part 261 defines listed and characteristic hazardous wastes; typical restaurant grease trap waste is not a listed hazardous waste.
12. EPA Report to Congress on the Impacts and Control of CSOs and SSOs (2004): EPA reported to Congress that grease was the most commonly reported cause of sanitary sewer overflow blockages, at 47 percent.