Grease trap guide 80 for the real first-year paper

Last updated 2026-08-21

What is a grease trap?

A grease trap is a plumbing interceptor that holds kitchen wastewater long enough for fats, oils, and grease to float and food solids to settle, so a clearer flow leaves to the building drain and the public sewer. Crews call the bigger outdoor tanks grease interceptors. Same job.

That is the whole device. It is not a fryer oil caddy. It is not a septic tank, even if some outdoor units look like one from the street. Yellow grease is the used fryer oil you keep in a closed bin for a renderer. Brown grease is the cold, nasty mix that collects inside the trap. Different waste. Different paper.

Most indoor units are hydromechanical. They are compact, they use a flow control fitting, and they are rated in gallons per minute off a manufacturer test. Outdoor gravity interceptors are large concrete or fiberglass tanks. They rely on detention time, not a fancy insert. Cities often want the outdoor tank on a new restaurant if the sewer crew has been burned by backups on that street.

The International Plumbing Code puts grease interceptors in Chapter 10 with other traps and separators. It requires them on grease-laden waste from food preparation areas, then leaves the amendments to the city. ^[4] The FDA Food Code does not design your tank. It does say this, word for word: "If used, a grease trap shall be located to be easily accessible for cleaning." ^[5] If your unit sits under a bolted cooler with no access path, you already failed a health item.

Federal water rules sit one layer back. They do not issue you a grease trap permit. They tell publicly owned treatment works they cannot accept interference or pass through from non-domestic users. 40 CFR 403.5 states: "Pollutants introduced into POTWs by a Non-domestic Source shall not Pass Through the POTW or Interfere with the operation or performance of the works." ^[1] Kitchen FOG is how a lot of that interference starts in the pipes, long before the plant.

EPA has estimated at least 23,000 to 75,000 sanitary sewer overflows a year, and that count leaves out backups into buildings. ^[7] Grease is one of the blockage materials those overflows are famous for. Your local FOG ordinance exists because of that mess, not because someone in Washington numbered your restaurant.

How do you start grease trap work?

You start grease trap work by calling two local offices and writing down what they actually require. The building or plumbing department tells you whether an interceptor is required and what permit you pull to set it. The sewer utility or pretreatment program tells you discharge rules, who may pump you, how often, and what manifest or log they want. Then you size the unit their way, install it, get the inspection, and keep the first-year file.

Skip the national myth. There is no federal grease trap license and no single startup packet that works in every county.

Here is the order I would actually use. Call the plumbing inspector first and ask if your use (restaurant, commissary, ghost kitchen, school cafeteria) is on their interceptor list. Ask which code edition they enforce and whether they want hydromechanical, gravity, or either. Then call the pretreatment or FOG coordinator at the sewer authority. Ask if you must register as a food service establishment, if they publish a hauler list, and where pumped waste is allowed to go.

Only after those two calls do you buy a box. People waste money here. They order a small indoor unit online because a salesperson said it was code, then the city says the line has to hit a large gravity interceptor outside. Confirm before you pour concrete.

If you are starting as a pumper, not a kitchen, your paper path is different. You are usually under a state liquid waste, septic, or transporter board, plus each city's FOG registration. The kitchen still owns the interceptor. You own the truck, the disposal ticket, and your license. Confirm both stacks. A longer walkthrough of first-year paper lives in Grease trap guide 75 for first-year operators and paper and Grease trap guide 72 for people starting the paper path.

Who has to install a grease interceptor?

Food service spots that send grease-laden waste down a drain are the usual yes. That means restaurants, cafeterias, commissaries, many bakeries, and school or hospital kitchens. A coffee counter with no food prep and no dishwasher may be a no. Ask. Do not guess from a forum post.

The plumbing code is the first trigger. IPC Chapter 10 requires an interceptor or automatic grease removal device on fixtures and equipment with grease-laden waste in food preparation areas. ^[4] Local amendments add or subtract uses. A city that just spent a week rodding FOG out of a main will write a longer list than a town that has never had a backup.

The second trigger is the sewer use ordinance and the pretreatment program. 40 CFR 403.8 generally requires a POTW pretreatment program when the plant design flow is greater than 5 million gallons per day and industrial users can cause pass through or interference. ^[2] Smaller plants can be pulled in too. Those programs write local FOG rules even if your kitchen is not a classic "industrial user."

Homes almost never need a commercial grease trap. A residence on a septic system is a different code stack. If you are converting a house into a cafe, you are not a house anymore. Call both offices before you sign the lease.

State environmental pages will tell you the FOG program exists, then send you local. Texas TCEQ's FOG assistance page and the Massachusetts FOG program page both point utilities and towns at local control, not a statewide kitchen permit. ^[10][12]

What paper do you file before a grease trap goes in?

You file a plumbing or building permit for the install or alteration, plus whatever FOG or industrial-user registration the sewer authority wants. Some cities also want the interceptor spec sheet, a simple site plan showing access, and a grease management plan. None of that is a national form. Confirm the packet with the board that stamps it.

I would walk in (or portal in) with four things. The menu and fixture list, so they can see dishwashers, wok lines, and pot sinks. The manufacturer cut sheet and flow rating, or the tank volume if it is gravity. A sketch of the sample port and the lid access. And the hauler you expect to use, if the city keeps a registered list.

Do not invent a processing time. I have seen same-week plumbing over-the-counter stamps and I have seen plans sit for a month. The honest move is to ask the current queue when you file. GreaseTrapPath is not the board and cannot quote your fee.

If the work is a replacement in the same footprint, ask whether they treat it as a repair or a new install. That one question changes the drawings. If you are cutting a new outdoor tank into a parking lane, budget for traffic control and a location that a pump truck can actually reach. Buried lids under a new patio are how first-year operators fail the Food Code access line. ^[5]

Keep a copy of every stamped page in a folder you can hand an inspector without unlocking your email. Grease trap guide for people who need the paper path walks the file in more detail.

How do you size a grease trap?

You size a grease trap with the method your plumbing official and sewer authority already wrote down, not with a national calculator you found at 11 p.m. Hydromechanical units are usually picked by gallons-per-minute flow and a certified test rating. Gravity interceptors are usually picked by liquid volume in gallons, sometimes with a meals-per-peak-hour or fixture formula on top.

There is no honest single size for an 80-seat restaurant. Cities disagree. One office wants a 25 gpm indoor unit on a remodel. The next town wants a 1,000 gallon outdoor tank on the same menu. If a salesperson quotes one number for the whole country, they are selling, not reading your ordinance.

IPC Chapter 10 is the common starting text for interceptors and separators. Local amendments then overwrite the table. ^[4] Pretreatment staff may also set a minimum volume because their collection system, not the plumbing code, is what they protect. EPA's local limits guidance is how plants justify numeric oil and grease limits in the sewer use ordinance. Your limit is the number in that ordinance, not a figure from a blog. ^[14]

What I would do: ask the plumbing desk which sizing method they accept in writing. Ask pretreatment if they have a floor volume for your use. Buy the larger of the two if they conflict. Undersizing is how you buy the unit twice.

Waste of money: paying for a custom engineering size when the city already publishes a simple fixture or seating method and will reject anything else. Match their paper.

What is the difference between a hydromechanical trap and a gravity interceptor?

A hydromechanical grease trap is a compact, usually indoor unit rated in gallons per minute. A gravity grease interceptor is a large outdoor tank rated in gallons of liquid volume. Both separate FOG. They fail in different ways and they generate different paper.

Hydromechanical units need the flow control the listing assumed. If someone removes that fitting so the dish line drains faster, the rating is fiction. Gravity tanks need inlet and outlet baffles that still exist, lids you can open, and a pump truck that can sit over them. If landscapers bury the lids, you will fail the access rule in the Food Code. ^[5]

Sewer authorities that just cleaned a FOG blockage often push gravity tanks. Remodels in tight buildings often push hydromechanical. Neither is morally better. The better one is the one both offices will inspect without a fight.

Point	Hydromechanical grease trap	Gravity grease interceptor
Typical spot	Indoors, near the dish pit	Outside, drive lane or yard
How it is rated	Gallons per minute, often a listed test	Gallons of liquid volume
What it needs to work	Flow control left in place	Baffles, detention, open lids
Common first-year failure	Undersized for the real peak flow	Lids paved over, truck cannot reach
Who often prefers it	Tight remodels	New restaurants after sewer backups

If you want a second pass on interceptor choice before you buy, Grease trap guide 76 and your first-year paper path is the next read.

What license do you need to pump grease traps?

A kitchen does not get a pumping license. A hauler does. The kitchen needs the interceptor approved and the pumping records. The hauler needs whatever liquid waste, septic, transporter, or FOG-pumper credential the state and the city wrote down. Confirm the current credential name with that board. I will not invent a fee or a quota.

Federal pretreatment rules sit on the plant and the industrial user, not on a national pumper card. 40 CFR 403.3 is where EPA defines interference and pass through, the two words every FOG ordinance leans on. ^[3] 40 CFR 403.5 is the specific prohibition layer. ^[1] Neither section hands you a truck license.

What I see in practice (and you still verify) is a stack: state transporter or pumper registration, local FOG hauler registration, and a legal place to unload. Unload sites are renderers, approved transfer stations, or plants that actually take brown grease. Storm drains are not a disposal site. Ever.

If you are the restaurant, ask the city for the registered hauler list. Hiring your cousin with a shop-vac is how you buy a violation and still own a full tank. If you are the hauler, do not start advertising in a city until that city says your state card is enough, or tells you which extra form they want.

State assistance pages in Texas and Massachusetts describe FOG programs and then send you local for the credential that matters on the truck. ^[10][12]

What first-year records does a grease trap actually need?

You need a pump-out log or manifest for every service, plus the install permit, the interceptor spec, and any FOG registration the sewer office issued. The manifest should show date, volume or percent full, hauler name and credential, and where the waste went. Keep it where an inspector can see it without a scavenger hunt.

That is the whole first-year file for most small kitchens. Some pretreatment programs add photos of the open tank, a sample-port location, or a cleaning contract. Significant industrial users can fall under the broader reporting in 40 CFR 403.12. Most cafes do not. Ask which bucket you are in. ^[2]

I like a cheap binder with four tabs: permit, spec sheet, manifests, inspection notes. Phone photos of the open interceptor after each pump-out have saved people when a hauler's handwriting was garbage. Digital only is fine if you can pull it up in the dish pit, not "in the cloud later."

GreaseTrapPath sells a $199 one-time Interceptor + Manifest Kit if you want that file assembled. You can also print the same logs from your city FOG page and grab a binder from the office store. I would not pay a consultant to invent forms the pretreatment office already posted.

EPA's introduction to the national pretreatment program is the background reading if you want to see why plants care about user files at all. It is a 2011 EPA manual, not your local checklist. ^[6] For a tighter operator walkthrough, use Grease trap guide 77 for operators who need the paper.

How often do you pump a grease trap?

You pump a grease trap on the schedule your sewer ordinance or FOG permit actually states. Many local programs use a percent-full trigger (often written as a 25 percent rule on FOG plus solids) or a calendar maximum, or both. That interval is local law. It is not a federal pumping deadline.

I will not quote your city's number as if it were national. Read the ordinance. If the rule is "25 percent or 90 days, whichever comes first," then 90 days is the backstop, not a suggestion. If the rule is only percent-full, you still need a way to measure it. A stick and a flashlight beat a guess.

Additives that claim to eat grease so you can skip pumping are usually a waste of money and sometimes banned. They can push emulsified FOG downstream, which is the opposite of what the interceptor is for. If a vendor promises you can stretch pump-outs with a bottle of enzymes, ask the pretreatment office before you buy the case. I would rather pay for a real pump-out.

Outdoor gravity tanks can look empty at the lid and still have a thick mat. Open it. Indoor units clog faster on a heavy fryer menu. Peak weeks (catering, holidays) move the schedule up. Build that into the contract so you are not begging for a truck on December 23.

The Massachusetts FOG program page is a public example of a state telling communities to keep food service grease out of collection systems. ^[12] Your town may be shorter. Same idea.

What does a first-year grease trap program cost?

First-year cost is the install (tank or indoor unit, piping, lids, maybe a sample port), the permit fees your city actually charges, and the pump-outs. I will not invent those fees or a national price. Confirm permit amounts with the board. Confirm pumping with written quotes from registered haulers.

The range is wide because the device is wide. A small listed indoor unit is a different invoice than an outdoor concrete tank, traffic plates, and a new sampling manhole. Labor and access drive more of the bill than the steel box. If the truck cannot reach the lid, you will pay for that forever.

What I would spend money on: the size both offices already agreed to, lids that open, and a hauler contract you can keep. What I would not spend money on: enzyme programs that replace pumping, decorative covers that hide the interceptor from the inspector, or a second backup indoor unit that the city did not ask for.

State-level cost walkthroughs on this site stay local on purpose. Start with grease trap cost in california, grease trap cost in florida, or grease trap cost in georgia if that is your map. Then still call your own utility, because two cities in the same state will not match.

Nobody has a clean national dataset of restaurant interceptor invoices. The closest honest inputs are the code requirement ^[4], the pretreatment framework that makes cities write FOG rules ^[6], and the overflow problem those rules are trying to shrink. ^[7][8]

What do grease trap inspections and violations look like?

A grease trap inspection is usually a lid opening, a look at FOG and solids depth, a check that the unit matches the permit, and a request for manifests. Health may only care that they can reach it. Pretreatment cares that it is working and that waste left in a legal truck. Different clipboards. Same tank.

Violations I would take seriously: a missing interceptor where the code required one ^[4], a unit you cannot open ^[5], no pump records, discharge of trap waste to a storm drain or a cleanout, and a tank so full it is a pass-through machine. EPA's 2004 Report to Congress on CSOs and SSOs is still the big federal document on why collection-system failures matter. ^[8] Your ticket will still be written under local sewer use rules.

Penalties are local. I will not invent a fine table. Ask the pretreatment office what they actually issued last year. Some cities start with a notice and a deadline. Some start with a locked sample port and a reinspection fee. Repeat FOG blockages that hit the public main are how kitchens get famous for the wrong reason.

If an inspector finds the flow control missing, or the outlet tee broken off, you do not argue brand loyalty. You fix the plumbing. If the hauler's manifest destination is a mystery address, you have a paper problem even if the tank looks pretty.

Photograph the open tank after every pump-out for the first year. Dated photos plus manifests close most "you never clean it" arguments.

Is there a national grease trap license?

No. There is no national grease trap license, no federal restaurant interceptor card, and no EPA sticker that lets you skip city hall. That is the myth this guide exists to kill.

What is national is the pretreatment framework. 40 CFR 403.5 prohibits pass through and interference. ^[1] 40 CFR 403.8 tells many POTWs they must run a pretreatment program, with a 5 MGD design-flow trigger that pulls in the larger plants. ^[2] 40 CFR 403.3 defines the words those programs use. ^[3] EPA's pretreatment introduction manual explains the structure in plain agency prose. ^[6] None of those documents license your trap.

Plumbing approval is the state-adopted code plus the local building official. FOG registration is the sewer authority. Pumping credentials are a state environmental or health board, sometimes plus a city list. Disposal is the renderer or the plant that will take brown grease. Four desks. Not one.

If someone sells you a nationwide grease trap certification as a substitute for those desks, walk away. If a course teaches you how to read a manifest and size from a published table, that can be useful. It still does not stamp the permit.

GreaseTrapPath is an independent publisher, not a law firm and not a service company. If you want the kit path, use /start. Confirm every fee and form with the board that stamps the permit. The rest of this page still works if you never click that link.

Frequently asked questions

What is grease trap?

A grease trap is a plumbing interceptor that slows kitchen wastewater so fats, oils, and grease float and solids settle before the rest goes to the sewer. Larger outdoor tanks are usually called grease interceptors. It is not a fryer oil bin and it is not a septic tank. Confirm the required type with your plumbing official.

How do you start grease trap?

Start with two calls. Ask the plumbing or building department if you need an interceptor and which permit to pull. Ask the sewer or pretreatment office about registration, pumping rules, and manifests. Then size the unit their way, install it, and keep pump records. There is no national startup license. Confirm fees with those boards.

Is a grease trap the same as a grease interceptor?

In the field, people use both words for the same job: pulling FOG out of kitchen waste. Codes often call small indoor hydromechanical units traps and large outdoor gravity tanks interceptors. Your city may treat the names as synonyms or as two product classes. Use the word on your permit so the inspector is not hunting for a different device.

Do I need a grease trap for a coffee shop?

Maybe. If you have food prep, a dishwasher, or grease-laden fixtures, the plumbing code and the sewer ordinance often say yes. An espresso-only counter with no food line may be a no. This is not a national rule. Ask the plumbing official and the FOG coordinator before you sign a lease or buy a unit.

Who pumps a grease trap?

A registered liquid waste or FOG hauler pumps it. The restaurant owns the tank and the records. The hauler owns the truck credential and the disposal ticket. Ask your city for the hauler list they accept. Do not treat a shop-vac and a cousin as a legal pump-out. Confirm the credential name with the state or city board.

What is a grease waste manifest?

A manifest is the paper (or city portal record) that shows when the trap was pumped, how much came out, who hauled it, and where it went. Keep every one in a file an inspector can see. Destination matters. A full tank pumped to a blank destination line is still a problem. Use the form your sewer authority already specified.

Can I use enzymes instead of pumping?

I would not. Many cities restrict or ban additives that claim to digest grease so you can skip service. They can push emulsified FOG downstream, which is how mains clog. Enzymes are a common waste of money if the pitch is stop pumping. Ask pretreatment in writing before you buy a case. Pay for a real pump-out.

How big should a grease trap be?

As big as the sizing method your plumbing official and sewer authority already published. Hydromechanical units are picked in gallons per minute. Gravity tanks are picked in gallons of volume, sometimes with a seating or fixture formula. There is no honest single national size. If the two offices conflict, I would install the larger one.

Do homeowners need grease traps?

Almost never for a regular house on a city sewer. A home kitchen is not a food service establishment. If you convert the house to a cafe, you are under commercial plumbing and FOG rules. Septic systems are a different code stack. Confirm with the building department before you advertise brunch.

What is brown grease vs yellow grease?

Yellow grease is used fryer oil you store in a closed container for a renderer. Brown grease is the mixed FOG and solids that collect inside the grease trap. They are not interchangeable on a manifest. Mixing them can get a hauler rejected at the unload site. Keep fryer oil out of the trap on purpose.

How do I find my pretreatment contact?

Call the wastewater or utilities number on your water bill and ask for FOG or pretreatment. Large plants that meet the 40 CFR 403.8 tests run formal programs. Smaller towns still have a collections supervisor who owns the ordinance. State pages in Texas and Massachusetts confirm the program exists, then send you local.

Is there a federal grease trap permit?

No. EPA sets the pretreatment framework and tracks sewer overflows. It does not stamp restaurant interceptors. Your permits are local plumbing approval plus whatever FOG registration the sewer authority wrote. Haulers add a state transporter or pumper credential. Anyone selling a federal grease trap permit is selling a myth.

What happens if I skip pumping?

The tank fills, FOG leaves through the outlet, and you risk a backup on your floor or in the public main. Inspectors can cite missing manifests, a unit past the local percent-full rule, and interference with the sewer. Fines are local, so ask the board for real numbers. Skipping service to save one invoice is how you buy a much larger one.

Can I install a used interceptor?

Only if the authority having jurisdiction says yes and you can prove baffles, rating, and a tight tank. I would not gamble on a used indoor unit with a mystery listing. A used gravity tank with cracked baffles is a hole in the ground that fails the first inspection. Get the acceptance in writing before you crane it in.

Sources

1. eCFR, 40 CFR 403.5 National pretreatment standards: Prohibited discharges: Federal pretreatment rules prohibit non-domestic pollutants that pass through a POTW or interfere with its operation.
2. eCFR, 40 CFR 403.8 Pretreatment Program Requirements: Development and Implementation by POTW: POTWs with total design flow greater than 5 MGD that receive industrial-user pollutants causing pass through or interference must establish a pretreatment program, unless the state assumes the role.
3. eCFR, 40 CFR 403.3 Definitions: Federal pretreatment regulations define interference and pass through, the terms local FOG and sewer-use rules rely on.
4. ICC, International Plumbing Code 2021 Chapter 10 Traps, Interceptors and Separators: IPC Chapter 10 is the model-code home for grease interceptors and separators on grease-laden food-preparation waste.
5. U.S. FDA, Food Code 2022: FDA Food Code section 5-402.12 states that if used, a grease trap shall be located to be easily accessible for cleaning.
6. U.S. EPA, Introduction to the National Pretreatment Program (EPA-833-B-11-001, 2011): EPA's 2011 pretreatment program manual describes how POTWs control non-domestic discharges under 40 CFR 403.
7. U.S. EPA, Sanitary Sewer Overflows (SSOs): EPA estimates at least 23,000 to 75,000 sanitary sewer overflow events per year, not including sewage backups into buildings.
8. U.S. EPA, Report to Congress: Impacts and Control of CSOs and SSOs (2004): EPA's 2004 Report to Congress is the primary national assessment of CSO and SSO impacts and control, including collection-system failures.
9. TCEQ, Fats, Oils, and Grease (FOG): TCEQ provides FOG assistance to Texas utilities and points food service grease control to local wastewater programs.
10. Massachusetts, Fats, Oils and Grease (FOG) Program: Massachusetts describes a FOG program for communities controlling grease discharges to collection systems.
11. U.S. EPA, Local Limits Development Guidance (2004): EPA's local limits guidance is the document POTWs use to set numeric sewer-use limits, including oil and grease.