Grease trap board in Delaware and the real paper path

Last updated 2026-08-19

Is there a grease trap board in Delaware?

No. Delaware runs no statewide grease trap board, and it issues no single interceptor card that clears every kitchen. The paper sits with your sewer utility, the local plumbing official, the Division of Public Health food program, and the Division of Professional Regulation if you are the plumber.

People still search the phrase. It is a habit borrowed from other license boards, not a Dover office name. Your county or city wastewater staff is the closest thing you will actually meet. They care about FOG (fats, oils, and grease) because it clogs collection lines and wrecks treatment plants.

Federal pretreatment rules already ban solid or viscous pollutants that obstruct a publicly owned treatment works. Local sewer ordinances pick up from there. ^[2][9]

Open in Wilmington and you talk to the city utility. Unincorporated New Castle County is a county conversation. Kent and Sussex work the same way, plus any town that runs its own pipes. Confirm the office before you order a tank.

Skip DNREC on a standard restaurant interceptor. DNREC owns the water pollution statute and the bigger discharge permits. A fryer line in a strip center is a local plumbing and sewer file. ^[3]

Do you need a license for a grease trap in Delaware?

A restaurant owner pulls no special state grease trap license. You still need the ordinary papers that touch the kitchen: a food establishment permit, a local plumbing permit for the interceptor, and whatever FOG registration your sewer utility uses. The person who pipes it needs a Delaware plumber license under Title 24, Chapter 18. ^[1]

Do not let a handyman set a 20-gallon under-sink box and call it done. Chapter 18 is the statute that keeps unlicensed people from holding themselves out as plumbers. Applications run through the state's DELPROS portal. Confirm the current plumbing application there, not on a copied blog checklist. ^[4][12]

Food is a different desk. Delaware food establishments fall under 16 DE Admin. Code 4458, the State of Delaware Food Code, which tracks the FDA Food Code. That code is not a tank license. It still talks about grease equipment. The FDA line Delaware follows is blunt: "If used, a grease trap shall be located to be easily accessible for cleaning." Inspectors remember that sentence when you bury a unit under a mixer. ^[5][6]

Sewer can feel like a third license. Some utilities want a FOG form, an interceptor inventory, or a hauler name on file before they sign off on occupancy. That is a local condition. Ask that utility for the current packet. A New Castle County sheet does not travel to Georgetown.

Lease only? Read the lease. Landlords love to say the interceptor is your problem and then lock the vault. Get access in writing.

Who actually permits a grease trap in Delaware?

Three desks split the job. The plumbing official permits the install. The sewer authority accepts the discharge. The health official permits the food operation. Plan on walking all three, even when one of them swears the other guy handles grease.

New Castle County publishes sewer rules in Chapter 38 of its code. That chapter governs what you may put in the public sewer. Wilmington keeps its own utility chapter. Towns in Kent and Sussex either point you to county engineering or run a town collection system. ^[7]

Federal law sits under that stack. 40 CFR Part 403 is the National Pretreatment Program. EPA's 2011 introduction to that program frames it as a cooperative federal, state, and local effort to protect treatment plants and water quality. Your county FOG letter is how that federal floor shows up in a Delaware kitchen. ^[8][9]

Treat the plumbing permit as the construction paper and the FOG file as the operating paper. You can pass a rough-in and still fail a later grease inspection if the vault is the wrong type. That happens more than people admit.

Other states get searched the same way. The writeups on the grease trap board in connecticut and the grease trap board in california show the same split: a plumber board plus a sewer program, not one grease agency.

How much does a grease trap cost in Delaware?

No official Delaware price list exists for a grease trap. Anyone quoting one statewide sticker is inventing it. Your cost is a bid, not a statute.

Four bills show up. The interceptor itself. The plumber plus any concrete or traffic-rated lid. The local permit and plan review fees. The pumping contract you pay all year. Confirm permit fees with the building department that will stamp the drawing. Confirm pumping with a hauler who can legally tip the waste.

I will not publish a fake statewide average. Hardware changes with hydromechanical versus gravity, indoor versus outdoor, and whether the utility wants a large gravity tank or accepts a smaller listed unit. Outdoor tanks plus excavation in a tight Wilmington alley cost more than an indoor unit in a new Sussex shell. That is construction, not a board fee.

Plan review for the food establishment is a separate check. Confirm it with the Division of Public Health Office of Food Protection. Plumbing permit fees live at the county or city. None of those offices want you using last year's copied fee table. ^[11]

Ongoing cost is the one owners forget. A trap that is too small gets pumped constantly. A trap sized right and scraped well gets pumped on the interval the utility wrote down. Get that interval in writing.

Waste of money: a pretty indoor unit a salesperson swears is code when your sewer authority has a published gravity-interceptor rule. Read the utility sheet first. Then bid the box.

If a GC bundles the interceptor as a tiny allowance, pull it out and bid it against the utility spec yourself.

How long does a grease trap take in Delaware?

Nobody honest hands you a statewide clock. Processing time is a local fact. Confirm it with the plumbing desk and the sewer desk that will sign your job. Do not treat a vendor date as an approval.

Sequence is what you control. Food plan review, plumbing drawings, interceptor shop drawings, utility FOG approval, permit issuance, install, test, final, first pump ticket. Order the tank before the utility accepts the size and you own a wrong tank.

Lead time on a gravity interceptor can beat the permit wait. Ask the supplier for current ship dates. Outdoor tanks need a hole, bedding, and sometimes a traffic lid. Rain will sit in that hole.

File the utility FOG packet the same week as the plumbing permit, not after fixture rough-in. Some inspectors will not schedule a final until they see the interceptor approval. That stall is avoidable.

Health is rarely the long pole if the drawing is complete. Incomplete menus delay food review more than the trap does. ^[11]

Compare that split to how people describe the grease trap board in florida or the grease trap board in georgia. The clock is always local.

What size grease interceptor does Delaware require?

Delaware publishes no statewide gallon number for every fryer. Size comes from the plumbing code your town adopted and from any stricter utility rule. Confirm both before you pay a deposit.

Most Delaware locals use the International Plumbing Code interceptor chapter as the model. IPC Section 1003 requires interceptors and separators "to prevent the discharge of oil, grease, sand and other substances harmful or hazardous to the building drainage system, the public sewer, the private sewage disposal system or the sewage treatment plant or processes." Your drawing should show the unit matches that duty. ^[7]

Utilities often add a method: drainage fixture units, meals per peak hour, or a minimum gravity volume for food service. I have watched owners lose a week because they installed a cute under-sink unit the catalog called a grease trap while the sewer authority wanted an outdoor gravity interceptor. The catalog is not the code official.

Have an existing vault? Measure it. Photograph the inlet, outlet, and rating plate. Send that to the utility before you assume a change of ownership lets you keep an undersized box.

Private septic is a different world. Some Sussex sites are still on-lot. A grease interceptor ahead of a septic tank is a DNREC and county environmental health conversation, more than a city FOG form. Confirm that path before you pour. ^[3][10]

What papers do you file before you install?

Start with a one-page map of desks. Plumbing permit application and riser diagram. Interceptor cut sheet and sizing notes. FOG registration or sewer discharge form if the utility uses one. Food establishment plan review. Proof the plumber is licensed in Delaware. ^[4][6][11]

The cut sheet should name the listing standard, the flow rate or gravity volume, and the access openings. If the lid needs a traffic rating, say so on the drawing. Inspectors should not have to guess.

On New Castle County sewer, read Chapter 38 before you submit. In the City of Wilmington, read the city utility rules. Do not mail a Kent form to Sussex and hope. ^[7]

The hauler contract can wait until you have a tank in the ground, but some utilities ask for the hauler name at permitting. Ask.

Keep the cut sheet, the pump tickets, and a blank manifest in one folder so the driver and the inspector see the same log. GreaseTrapPath sells a $199 Interceptor + Manifest Kit at /start if you want that packet assembled. A cheap binder with the utility's own forms works if you actually use it.

Keep copies of the stamped set. When the first inspector is out and the second one shows up, a photo of a text message will not save you.

Paper	Who stamps it	Typical trigger
Plumbing permit	City or county building	New interceptor or relocation
FOG or sewer form	Wastewater utility	Food service discharge
Food plan review	Division of Public Health	New or remodeled kitchen
Plumber license	Division of Professional Regulation	The person doing the work
Waste transport credentials	DNREC program if applicable	The pumper, not the cook

Confirm current form names. Offices rename packets.

What does the Delaware food code say about grease traps?

16 DE Admin. Code 4458 is the State of Delaware Food Code. It tracks the FDA Food Code. It is not a tank-sizing manual. It still gives health inspectors a hook. ^[5][6]

The line that bites on a walkthrough is the access rule. Use a grease trap and it has to be easy to clean. A unit pinned behind a water heater fails that sentence. So does a lid you cannot lift without moving a prep table.

Health also cares that sewage backs up nowhere near food. A surcharging interceptor is a health complaint, not only a sewer complaint. Indoor vault? Plan for odor and splash.

Put the cleaning access on the drawing you send to health, not only on the plumbing sheet. One extra note saves a comment letter.

Food plan review will ask about warewashing and grease-producing equipment. List the wok line. People hide the wok line and then wonder why the interceptor looks small. ^[11]

Do grease haulers need a Delaware permit?

The restaurant does not become a waste transporter by owning a trap. The person who sucks the tank and drives away is in a different pile. DNREC runs solid waste and water pollution rules under Title 7. Confirm current hauler credentials with DNREC and with your sewer utility. ^[3][10]

Ask the driver for the company name, the truck identifier, and a printed ticket with date, gallons, and destination. If they shrug, hire someone else.

Some utilities specify approved haulers. Some only require you to keep manifests. Follow the stricter paper.

Do not pour the tank into a storm drain or a toilet. That is not a gray area. 40 CFR 403.5 bars "Solid or viscous pollutants in amounts which will cause obstruction to the flow in the POTW resulting in interference." Local sewer codes repeat that idea in plainer words. ^[2]

Interstate haulers get people in trouble when a cheap quote comes from a truck that cannot legally tip in Delaware. Confirm the destination, not only the price.

Who do you call in New Castle, Kent, and Sussex?

Call the sewer provider of record, not the state. New Castle County public works (or the City of Wilmington, Newark, or another town system) is the northern conversation. Kent County engineering or the City of Dover is the central one. Sussex County engineering or the coastal towns is the southern one. Confirm which pipe you actually sit on. Listing sheets are wrong more than once.

Incorporated towns can surprise you. A Rehoboth or Seaford address is not automatically a county interceptor review. Ask the town building official who reviews FOG.

Septic sites in lower Delaware still need an interceptor conversation, just with on-site staff in the room. ^[3]

Keep a single contact log: name, phone, date, what they told you to file. The verbal "you are fine" evaporates at final inspection.

Owners moving from the grease trap board in illinois or the grease trap board in alabama sometimes expect a statewide FOG permit number. Delaware does not work that way.

What happens if you skip the interceptor?

The sewer backs up, or the inspector writes you up, or both. FOG is not a style choice. EPA's pretreatment program exists because untreated commercial wastewater damages plants and collection systems. ^[8][9]

A backup into a kitchen is a health shutdown risk. A backup into the street is a utility enforcement risk. Either one costs more than the tank you skipped.

Civil penalties live in the local sewer ordinance and in state water pollution law. 7 Del. C. Chapter 60 is the environmental control statute. I am not going to invent a fine table. Read the ordinance you are under and confirm current penalty language with that office. ^[3][10]

Insurance arguments after a grease overflow are miserable. Carriers ask for pumping logs. No logs, no file, just a story.

What does first-year grease trap operations look like in Delaware?

Year one is where kitchens lose the paper. Install day is loud. The third Saturday in February is the day nobody logged a pump-out.

Ask the utility for the required frequency in writing. Some programs use a 25 percent grease and 25 percent solids clean-out trigger. Some use a fixed number of days. Follow the written rule, not a driver's guess. Confirm the rule that applies to your address.

Keep every ticket. Date, gallons, hauler, destination. Train one person to refuse a ticket that says pumped with no volume. That ticket is worthless in an inspection.

Indoor units need more skimming between pump-outs. Assign it. If it is everyone's job, it is nobody's job.

Schedule the first look at the vault yourself at 30 days. If it is already loaded, your size or your kitchen practice is wrong. Fix it before the utility does.

For how other states expect that first-year file to look, the grease trap board in arizona notes are a useful contrast, not a Delaware form.

What would you do if you opened a Delaware kitchen next month?

I would identify the exact sewer provider from a utility bill or a will-serve letter, not from a map app. I would request the current FOG packet that same week.

I would hire a Delaware-licensed plumber who has pulled an interceptor permit in that same jurisdiction in the last year. Out-of-state GCs miss local lid and sampling-port details. ^[1][12]

I would send the cut sheet to the utility before I paid a deposit on the tank.

I would file food plan review with the interceptor shown on the plumbing sheet and access clearances dimensioned. ^[11]

I would refuse to open on a "we will set the trap later" promise. Later becomes never, then a backup.

I would not buy a used steel tank with no rating plate.

I would put pumping on a calendar the day the tank goes in, not after the first odor complaint.

GreaseTrapPath is an independent publisher, not a law firm and not a service company. Nothing here is a permit. Confirm every fee, form name, and review time with the office that will inspect you.

Still comparing state paper paths? The grease trap board in colorado page is another example of how little of this is truly statewide.

Frequently asked questions

Do you need a license for grease trap in Delaware?

The owner does not get a special state grease trap license. You need a local plumbing permit, a food establishment permit, and any FOG form your sewer utility uses. The installer needs a Delaware plumber license under Title 24, Chapter 18. Confirm current plumber applications on DELPROS and confirm the FOG packet with the utility that owns the pipe.

How much does grease trap cost in Delaware?

There is no official statewide price. Cost is a construction bid plus local permit fees plus a pumping contract. Hardware changes with indoor hydromechanical units versus outdoor gravity tanks. Confirm permit fees with the building department that will stamp the job. Confirm pumping with a hauler who can legally dispose of the waste in Delaware.

How long does grease trap take in Delaware?

There is no honest statewide processing time. The clock is the plumbing desk, the sewer FOG review, food plan review, tank lead time, and weather if you are burying a vault. File the utility packet with the plumbing permit. Confirm current review expectations with those offices. Do not treat a supplier ship date as an approval.

Is there a Delaware grease trap board phone number?

No. There is no statewide grease trap board to call. Call the sewer provider of record, the local building or plumbing official, and, for the food permit, the Division of Public Health Office of Food Protection. Licensed plumbers use the Division of Professional Regulation and DELPROS. Ask each desk for the current reviewer phone, because duty phones move.

Does New Castle County require an outdoor interceptor?

Do not guess from a catalog. New Castle County sewer use rules live in Chapter 38, and the plumbing official still has to accept the install. Some food service jobs need a gravity interceptor the utility will accept. Confirm the current sizing method and location rules with county public works and the building department for your exact address.

Can I install my own grease trap in Delaware?

Plumbing work on an interceptor is licensed work under Title 24, Chapter 18. If you are not a Delaware-licensed plumber, do not assume you can set the tank. Ask the local plumbing official and DPR whether any narrow owner exception applies to your job. Most commercial kitchens should hire a plumber who has pulled this permit locally.

What is a FOG permit in Delaware?

FOG means fats, oils, and grease. Some Delaware utilities require a registration, inventory, or discharge approval before a food service kitchen may use the public sewer. It is a local utility condition, not a state board card. Ask the provider named on the water or sewer bill for the current packet and keep a copy with your plumbing permit.

How often do I pump a grease trap in Delaware?

Delaware does not publish one statewide pump interval. Your sewer utility sets the rule. Some programs use a 25 percent grease and 25 percent solids trigger. Some use a calendar interval. Get the written frequency for your address and keep every ticket with date, gallons, hauler, and destination.

Do food trucks need a grease trap in Delaware?

The truck still produces grease. Health plan review and the commissary's interceptor rules usually matter more than a tank bolted to the truck. Confirm with the Office of Food Protection and with the commissary or event venue that receives the wastewater. Do not dump fryer oil or trap waste into a city drain.

Who inspects grease traps in Delaware?

Expect more than one badge. The plumbing inspector checks the install. The sewer or FOG program checks sizing, maintenance, and tickets. The food inspector checks access, sanitation, and backups near food. A DNREC conversation is more likely if you are on a discharge permit or an on-lot septic system, not for a typical city restaurant hookup.

Does Delaware follow the International Plumbing Code for interceptors?

Most local Delaware building departments adopt the International Plumbing Code, including the interceptor chapter, sometimes with local amendments. The sewer utility can still be stricter on type and volume. Confirm the adopted code edition and any FOG add-on with the official who will inspect the vault. Bring the cut sheet that matches that edition.

What records should I keep the first year?

Keep the stamped plumbing set, the interceptor cut sheet, the utility FOG approval, every pump ticket, and a simple cleaning log. Tickets need date, gallons, company, and destination. If an inspector or an insurer asks after a backup, that folder is the whole defense. A binder with the utility's own forms is enough if you fill it in.

Can I use an under-sink grease trap only?

Only if the plumbing official and the sewer utility both accept that unit for your menu and fixture load. Many food service sites get told to install a gravity interceptor even when a catalog calls a small indoor box a grease trap. Send the cut sheet to the utility before you buy. Replacing a wrong unit costs more than asking first.

Where do I confirm current Delaware plumber license rules?

Use Title 24, Chapter 18 for the statute and DELPROS for the live application. The Division of Professional Regulation board pages change form names. Confirm fees and exam steps on those official pages the week you apply. A restaurant FOG form does not replace a plumber license, and a plumber license does not replace a FOG form.

Sources

1. Delaware Code, Title 24 Chapter 18 (Plumbing, HVACR Examiners): Delaware titles plumber and HVACR licensing in Title 24, Chapter 18 rather than in a grease trap board statute.
2. U.S. eCFR, 40 CFR 403.5 National pretreatment standards: Prohibited discharges: 40 CFR 403.5 prohibits solid or viscous pollutants in amounts which will cause obstruction to the flow in the POTW resulting in interference.
3. Delaware Code, Title 7 Chapter 60 Environmental Control: Delaware's environmental control statute, including water pollution authority, is Title 7, Chapter 60.
4. Delaware Division of Professional Regulation, DELPROS licensing portal: Delaware professional licenses, including plumbing, are applied for through the DELPROS portal.
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. Delaware Administrative Code, 16 DE Admin. Code 4458 State of Delaware Food Code: Delaware food establishments are regulated under 16 DE Admin. Code 4458, the State of Delaware Food Code.
7. New Castle County Code of Ordinances, Chapter 38 Sewers and Sewage Disposal: New Castle County regulates public sewer use, including what may be discharged, in Chapter 38 of its code.
8. U.S. EPA, Introduction to the National Pretreatment Program (2011): EPA describes the National Pretreatment Program as a cooperative federal, state, and local program to protect municipal treatment plants and water quality.
9. U.S. eCFR, 40 CFR Part 403 General Pretreatment Regulations: 40 CFR Part 403 is the federal National Pretreatment Program regulation that local FOG and sewer programs implement.
10. Delaware Code, Title 7 Chapter 60 Subchapter II (permits and licenses): Title 7, Chapter 60, Subchapter II is the Delaware permit framework for activities that may discharge water pollutants.
11. Delaware Division of Public Health, Office of Food Protection: Delaware food establishment plan review and inspection are handled by the Division of Public Health Office of Food Protection.
12. Delaware Code, Title 24 Chapter 18 Subchapter II License: Subchapter II of Title 24, Chapter 18 is the Delaware plumber licensing subchapter used for installer credentials.