How grease trap renewal actually works in Colorado

Last updated 2026-08-19

What is grease trap renewal in Colorado?

Grease trap renewal in Colorado is a local paper cycle, not a state license you mail to CDPHE. You keep the kitchen's retail food license current, you follow the FOG or industrial-user rules your sewer utility actually wrote, and you keep pump-out records that match that utility's fill cap or schedule. That is the whole renewal idea.

People search this phrase because vendors talk like there is a Colorado grease card. There is not. The state licenses plumbers and sets water-quality and retail-food rules. Cities, counties, and sanitation districts run the interceptor programs. Metro Denver is not Colorado Springs. A mountain town with a small plant can be stricter than a big city.

If you already operate, renewal usually means three folders. Food license renewal with your local public health agency. Any wastewater permit or FOG registration your utility issued (many small shops only have the plumbing approval plus a pumping rule). Hauler tickets that show the tank was fully emptied on time. If you are still building, you are not in renewal. You are in permit and inspect.

Ignore anyone selling a statewide grease trap renewal package. Pay the city. Pay a licensed plumber. Pay a hauler who leaves a ticket you can read. That is the paper path for grease trap work in Colorado.

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

You do not need a separate statewide grease trap license in Colorado. You do need a retail food license to run the kitchen, a local plumbing permit to install or replace the interceptor, and whatever discharge authorization your sewer utility requires. Confirm that mix with the local public health agency and the utility, not with a national checklist.

Colorado's Food Protection Act sits in Title 25 of the Colorado Revised Statutes. It is the reason restaurants, bars, and many commissaries carry a retail food license issued by a county or district public health agency (or, in a few cases, CDPHE). That license is about food safety. Inspectors still look at grease handling because a backed-up floor sink is a health problem. It is not a grease-trap license. ^[5]

On the sewer side, federal pretreatment rules already ban dumping solid or viscous pollutants in amounts that obstruct the plant. 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." Local utilities write the FOG details on top of that ban. ^[1]

Some Colorado cities issue an industrial wastewater permit or a FOG registration for food service. Denver's wastewater rules live in Revised Municipal Code Chapter 56. Aurora, Boulder, Fort Collins, and Colorado Springs each run their own pretreatment shop. If they never handed you a renewable wastewater permit, do not invent one. Ask them in writing whether food service needs a separate FOG authorization or only plumbing approval plus pumping. ^{[6] [10] [11] [12]}

A licensed plumber pulls the building permit. The State Plumbing Board licenses the tradesperson. The city or county building department stamps the job. That permit dies when the inspection closes. You do not renew a plumbing permit every year. ^[7]

Paper	Statewide grease license?	Typical cycle	Who confirms
Retail food license	No, this is a food license	Usually annual	Local public health agency
Plumbing permit	No	One job	City or county building dept
FOG or industrial user permit	Only if your utility issues one	Often annual if it exists	Sewer utility or district
Pump tickets / manifests	No	Every pump-out	Hauler plus utility

If a seller says you must renew a "Colorado grease interceptor license" each year for a fee they collect, walk away. Compare that noise with how grease trap renewal in Arizona and grease trap renewal in California actually work. Same pattern. Local sewer, local health, no magic state card.

Who actually regulates grease traps in Colorado?

Three layers share the work, and they do not sit in one office. Federal law sets the floor. Your city or sanitation district writes the rule you will fail. CDPHE watches the plants, not your fryer.

Federal pretreatment law is the floor. 40 CFR 403.8 tells publicly owned treatment works when they must run a pretreatment program. Big Colorado plants already do. The EPA's 2011 pretreatment manual puts it plainly: "The National Pretreatment Program is a cooperative effort of federal, state, and local environmental management agencies established to protect water quality." ^{[2] [4]}

CDPHE's Water Quality Control Division oversees discharge permits and pretreatment program approvals under the Colorado Water Quality Control Act in Title 25. CDPHE does not mail you a grease trap sticker. It does not collect an annual grease-trap renewal fee from restaurants. If a website says otherwise, it is selling a myth. ^[5]

Your city sewer utility or a regional plant such as Metro Water Recovery writes the FOG rules you will actually fail. They decide interceptor sizing references, the common 25 percent depth cap, pump intervals, hauler approval, and whether you file an annual report. Denver DOTI, Aurora Water, Colorado Springs Utilities, Fort Collins Utilities, and Boulder each publish their own version. ^{[9] [10] [11] [12]}

Health departments care when grease hits the kitchen. Building departments care when you bury a tank. If those three offices give you three different answers, get it in email and follow the stricter sewer rule on pumping. Do not play them against each other.

How much does a grease trap cost in Colorado?

Colorado does not publish a statewide grease trap price. What you pay is a stack of local permit fees, a tank and install bid, and a pumping contract. Confirm every government fee on the current city or county fee page. I will not invent those numbers.

Hardware and labor swing hard. An indoor hydromechanical unit for a small cafe can land in the high hundreds to low thousands installed if the rough-in is easy. A buried gravity interceptor (think 750 to 2,000 gallons) is a different job. Excavation, traffic control, concrete, sampling tees, and a full plumbing inspection push many Front Range bids into several thousand dollars, and tight urban alleys go higher. Nobody has a clean public dataset that pins a Colorado median. Treat national "average cost" slideshows as entertainment.

Pumping is the line item that repeats. Front Range quotes operators share often sit in the low hundreds per visit for a standard outdoor tank, more if the lid is buried, the truck needs after-hours access, or the interceptor is huge. Mountain towns can cost more because the disposal plant is farther. That band is market talk, not a state series. Get two local hauler quotes and keep the written one.

Permit fees are real and local. Building departments post plumbing permit formulas. Some utilities charge FOG registration or industrial user fees. Retail food license fees sit under the Food Protection Act and local boards. Look up this year's schedule. Do not reuse a blog number from 2019. ^{[5] [7]}

Waste of money: oversizing because a salesperson showed you a scary chart, then skipping sample tees so you cannot measure the 25 percent layer. Also a waste: paying a consultant to expedite a state grease license that does not exist. Compare raw install talk with grease trap cost in Arizona and grease trap cost in California if you are pricing a multi-state kitchen. Same cost buckets, different city stickers.

If you just need a binder for specs and tickets, GreaseTrapPath sells a $199 one-time Interceptor + Manifest Kit at /start. The kit does not replace a permit. You can stay legal with a folder from the supply closet.

How long does a grease trap take in Colorado?

A pump-out takes about an hour on a clear lid. A new indoor unit can go in during a short close if the permit is already stamped. A new outdoor interceptor is a multi-week project once you count design, locates, permit review, dig, set, inspect, and backfill. No Colorado office publishes a guaranteed review clock. Ask your building department for the current plumbing-permit queue.

Permit review is the piece people forget. Some small towns stamp a simple indoor unit in a few days. Denver, Aurora, and other busy shops can sit longer, especially if civil drawings are thin or you are working in the right-of-way. I will not quote a day count I cannot source. Call the permit tech and ask for the present wait, in writing.

Health licensing for a new retail food establishment is a separate clock. Plan review, construction inspections, and the opening inspection follow your local public health agency's packet. That packet is on their site. Do not treat a plumber's promise as a health-department approval. ^[5]

If you are only renewing, the time is paperwork. Food license renewals are typically an annual form and fee. FOG reports, if your utility requires them, follow that utility's calendar. Pumping is scheduled against the 25 percent rule or a fixed interval. EPA's 2012 food-service FOG fact sheet is why so many cities still talk about a 90-day default. Your city may use that number, a tighter number, or only the depth cap. Confirm it. ^[3]

What paper do you need to keep for a Colorado grease interceptor?

Keep the as-built or manufacturer sheet (size, inlet, outlet, sample tee), the closed plumbing permit, every hauler ticket, and any letter or permit the sewer utility sent you. Keep the retail food license too, because that is the license inspectors actually ask to see.

Tickets should show date, gallons or a full pump-out statement, the hauler name, and where the waste went. A photo of the open interceptor before and after the pump is cheap insurance. If your city uses a 25 percent rule, a dip measurement on the ticket is the whole game.

EPA's 2012 food-service FOG fact sheet is the document many Colorado utilities still echo when they write local codes. It walks through why food service establishments get interceptors and how control authorities set cleaning triggers. Read that short PDF before you argue with an inspector. ^[3]

How long to keep paper? Follow the utility letter. If they are silent, keep three years of tickets on site and a digital copy off site. Title 25 does not give you a grease-manifest retention number. Local rules win. ^[5]

Haulers in pretreatment cities often need to be on an approved list. Ask before you book the cheapest truck from a random flyer. A ticket from an unapproved hauler can be treated as if you never pumped.

How often do you pump a grease trap in Colorado?

As often as your sewer utility says, or when grease plus settled solids hit the local fill cap, which is commonly 25 percent of liquid depth. EPA describes that 25 percent trigger as a widespread control-authority practice. It is not a Colorado statute. Confirm the number in your city packet. ^[3]

A 90-day default shows up in a lot of municipal FOG pages nationwide, including Front Range programs that borrowed EPA fact-sheet language. High-volume fry kitchens blow past 90 days. A low-volume sandwich shop might be cleaner at 90 days than a ghost kitchen at 30. Measure. Do not worship the calendar if the city uses the 25 percent rule.

Under-sink hydromechanical units need far more frequent service than a 1,000-gallon outdoor interceptor. If you bought the small box to dodge a dig, budget weekly or monthly cleaning. That is the trade. Shops that save on the tank often spend the difference on emergency service calls.

Put the next pump date on the walk-in door. Missed pumps are how you meet a camera crew from the utility.

What happens if you skip grease trap pumping in Colorado?

The sewer utility can hit you with a notice of violation, require an immediate pump-out, bill you for a mainline blockage, or escalate toward permit action if you hold an industrial user permit. If grease leaves the collection system, you also have a water-quality problem under state and federal rules. ^{[1] [5]}

Health inspectors can mark a clogged kitchen drain or an overflowing indoor trap as a violation on the retail food inspection. That path can close a kitchen even when the sewer utility has not called yet. The food license and the sewer rule are separate hammers. Either one can ruin a Saturday.

Reality check: many first failures are a warning plus a deadline. Repeat failures get expensive. Do not test how nice your city is. Nobody publishes a clean statewide fine table for FOG, and I will not invent one. Ask the utility what their current enforcement ladder looks like.

Blockages also hit neighbors. That is why Denver Chapter 56 and the other city codes bother with FOG at all. Federal pretreatment rules exist because viscous waste in the wrong amount interferes with the plant. Kitchen grease is exactly that kind of waste when you let the tank cake over. ^{[6] [1]}

How do Denver, Aurora, and Colorado Springs handle FOG differently?

They all ban sewer-killing grease. They do not share one form. Read the utility on your sewer bill, not a Front Range rumor.

Denver wastewater rules sit in Chapter 56 of the Revised Municipal Code, with Industrial Pretreatment staff under the Department of Transportation and Infrastructure. Food service in Denver should assume an interceptor, approved haulers, and records. Read the current industrial pretreatment pages and the code section before you open. Do not rely on a manager's memory from 2016. ^[6]

Aurora Water runs pretreatment for Aurora. Their packet, not Denver's, controls if your tap is Aurora. Same metro area, different plant rules and different phone number. The sewer chapter of Aurora's code is the document to print. ^[10]

Colorado Springs Utilities publishes its own FOG and pretreatment requirements under city utilities rules. If you are in El Paso County but not on CSU sewer, you may be under a special district instead. Ask who treats the flow. The city code is on Municode. ^[11]

Fort Collins Utilities posts public FOG guidance and industrial pretreatment contacts. Boulder writes interceptor and discharge rules in its municipal code Title 11. Metro Water Recovery sets industrial wastewater rules for much of metro Denver's regional treatment, which then shows up in member-city programs. ^{[12] [9]}

Call the utility whose name is on the sewer bill, not the city that collects sales tax, if those differ. Then do the same homework you would do for grease trap renewal in Idaho or the real paper path in Alabama: find the POTW, find the FOG PDF, print it.

What is the first-year paper path for a new Colorado kitchen?

Start with who owns the sewer and who issues the retail food plan review. Those two names drive everything else. Write them on the top of a legal pad before you order stainless.

Get a grease interceptor sized from the plumbing code your city adopted (Colorado jurisdictions use the International Plumbing Code with local amendments) and from any extra FOG sizing the utility published. Have a licensed plumber submit. Do not let a kitchen designer pick a pretty indoor box if the utility wants a 1,000-gallon gravity interceptor outside. ^[7]

While the tank goes in, file the retail food plan review with the local public health agency. Their checklist will ask about warewashing, hot water, and finishes. Some agencies ask you to show the interceptor on the plumbing plan. Bring the cut sheet. Title 25 is why that food packet exists. The interceptor detail is how you keep the opening inspection from stalling. ^[5]

Before opening: plumbing final, health opening inspection, first pump scheduled, a blank log on a clipboard. If the utility wants a FOG registration, file it before the first service, not after the first backup.

Year one is when people lose tickets. Photograph every pump. If ownership changes, copy the as-built out of the landlord's email archive now. Cost planning for year one is tank plus permit plus roughly four to twelve pumps plus the food license. See what you'll actually pay in Alabama for the same cost stack in another state. The categories travel. The dollar line does not.

Do you need a plumber's permit to replace a grease interceptor in Colorado?

Yes in any city that adopted a plumbing code, which is effectively the whole state for commercial work. Replacing a buried interceptor is new plumbing, not a janitorial task. A licensed plumber pulls the permit. The State Plumbing Board is the licensing agency for that tradesperson. ^[7]

Swapping an indoor cartridge or cleaning a hydromechanical unit is maintenance. Cutting out the box and hanging a new one is usually a permit. When in doubt, call building inspection and ask one question: "Does replacing a grease interceptor require a plumbing permit at this address?" Get the name of the person who answers.

The inspection is not theater. They want proper vents, cleanouts, sample tees, and a tank that matches the approved drawing. A tank you cannot open or measure will fail you later even if it passes a rushed final.

Working without a permit is how you fail the next health inspection and the next property sale. It is also how you bury a tank with no sample tee. Do not do that to save a week.

What should you confirm with the local board before you renew anything?

Confirm four facts in writing. Whether food service at your address needs a FOG registration or industrial user permit this year. The current pump rule (calendar, 25 percent, or both). The current retail food license fee and due date. Whether your hauler is still on the approved list.

Then confirm one construction fact if you might replace the tank: the plumbing code edition and the utility's minimum interceptor size for your menu. Those two numbers change when a city adopts a newer IPC or tightens FOG rules. An old drawing is not a grandfather letter unless the utility says it is.

GreaseTrapPath is an independent publisher, not a law firm and not a hauler. Use /start only if you want the Interceptor + Manifest Kit for your own records. It will not stamp a Colorado permit.

If a number in an old blog fights a PDF on a .gov site, the .gov site wins. Rules move. Confirm them.

Frequently asked questions

Do you need a license for grease trap in Colorado?

No separate statewide grease trap license exists. You need a retail food license to operate the kitchen, a local plumbing permit to install or replace the interceptor, and any FOG or industrial-user authorization your sewer utility actually issues. Confirm that mix with the local public health agency and the utility on your sewer bill.

How much does grease trap cost in Colorado?

Colorado publishes no statewide price. Indoor units often land in the high hundreds to low thousands installed. Buried 750 to 2,000 gallon interceptors commonly run several thousand dollars once excavation and inspection are in. Pumping often sits in the low hundreds per visit on the Front Range, with wide scatter. Confirm permit and food-license fees on the current local fee page.

How long does grease trap take in Colorado?

A pump-out is about an hour if the lid is open. Indoor swaps can finish in a short close after the permit stamps. Outdoor interceptors take weeks once you count drawings, locates, review, dig, and inspect. Food-license plan review is a separate clock. No state office publishes a guaranteed review time. Ask the building department for the present queue.

Is there a state grease interceptor permit from CDPHE?

No. CDPHE oversees water-quality permits and pretreatment program approvals under Title 25. It licenses some retail food work and writes statewide food rules. It does not issue restaurant grease-trap stickers. Your sewer utility and your building department are the offices that touch the tank.

Does Denver require a grease interceptor for every restaurant?

Denver wastewater rules in Chapter 56 plus Industrial Pretreatment practice treat food service as a FOG source. Plan on an interceptor, approved hauling, and records unless pretreatment staff tell you otherwise in writing for your menu and address. Read the current Denver DOTI pretreatment pages. Do not copy an Aurora or suburban setup into a Denver tap.

How often do I have to pump in Colorado Springs or Aurora?

Whatever that utility printed, which is often a 25 percent depth cap, a calendar interval, or both. Many U.S. FOG programs still echo EPA's 90-day example. That is not automatically your number. Ask Colorado Springs Utilities or Aurora Water for the current FOG sheet for food service at your address and keep the email.

Who can pump a grease trap in Colorado?

A hauler your sewer utility accepts, using a truck that can fully evacuate the tank and take the waste to an approved disposal site. Some cities keep an approved-hauler list. A cheap cash pump with no ticket can be treated as no pump. Ask the utility before you book.

Do I keep manifests after the hauler leaves?

Yes. Keep the ticket on site. It should show date, a full pump-out or gallons, hauler name, and disposal location. If the city uses a 25 percent rule, a dip measurement helps. Keep three years unless your utility letter sets a different retention period.

Can I use an indoor under-sink grease trap instead of an outdoor interceptor?

Only if the adopted plumbing code and the sewer utility both allow it for your fixtures and menu. Many Colorado utilities want a gravity interceptor outside for full kitchens. The small indoor box needs much more frequent cleaning. Get the utility answer in writing before you buy stainless around the wrong tank.

What if I buy an existing restaurant with a buried interceptor?

Find the as-built, the last three years of tickets, and any FOG letter tied to the address. Open the lid and measure the layers before you close. Budget a camera and a pump on day one. A missing sample tee is a rebuild conversation, not a surprise you want in month six.

Does a food truck need a grease trap in Colorado?

Most licensed trucks must work out of a commissary. The commissary interceptor and that site's FOG rules are what matter, plus whatever the truck's local health agency printed. Do not dump fryer oil in a park drain. Confirm commissary and grease handling with the agency that issued the truck's retail food license.

Will my retail food inspection fail if the trap is overdue?

It can. Health inspectors care about backed-up sinks, overflowing indoor traps, and grease on kitchen surfaces. Sewer staff care about the collection line. Either path can shut you down. An overdue outdoor interceptor with a clean kitchen may draw the utility first. Do not use that as a plan.

Do strip-mall landlords handle grease trap renewal?

Sometimes they own the shared interceptor and contract the hauler. You still hold the food license and you still catch the violation if the tank is full. Get the shared-tank schedule in the lease and copies of tickets. If the landlord is late, pump it and bill them later.

Where do I confirm the current local rule?

Call the utility on the sewer bill and the local public health agency that issues your food license. Ask for the current FOG PDF, the pump rule, and this year's food-license fee. Building inspection confirms plumbing permits. If a blog fights those three offices, ignore the blog.

Sources

1. eCFR, 40 CFR 403.5 National pretreatment standards: Prohibited discharges: Federal pretreatment rules prohibit solid or viscous pollutants in amounts that will cause obstruction to POTW flow resulting in interference.
2. eCFR, 40 CFR 403.8 Pretreatment program requirements: POTWs that meet federal thresholds must operate a pretreatment program that controls industrial and commercial discharges.
3. U.S. EPA, Controlling FOG Discharges from Food Service Establishments (2012): EPA describes the 25 percent depth cap and 90-day cleaning example as common control-authority practice for food service interceptors.
4. U.S. EPA, Introduction to the National Pretreatment Program (EPA-833-B-11-001, 2011): The National Pretreatment Program is a cooperative federal, state, and local effort established to protect water quality.
5. Colorado General Assembly, Colorado Revised Statutes Title 25 (2024 PDF): Title 25 contains the Food Protection Act retail-food licensing scheme and the Water Quality Control Act discharge-permit framework.
6. City and County of Denver, Revised Municipal Code Chapter 56 Utilities: Denver wastewater and industrial-waste rules that govern discharges to the sanitary sewer, including FOG control authority.
7. Colorado Department of Regulatory Agencies, State Plumbing Board Laws, Rules and Policies: Colorado licenses plumbers through the State Plumbing Board and points to the state plumbing statutes and 3 CCR 720-1 code rules used on commercial interceptor jobs.
8. Metro Water Recovery, Industrial Pretreatment Program: Metro Water Recovery runs the regional industrial pretreatment program that member communities in metro Denver implement for regulated discharges.
9. City of Aurora, Code of Ordinances Chapter 138 Utilities Article IV Sewers: Aurora sewer ordinance is the local legal hook for wastewater discharge and pretreatment requirements inside Aurora Water's service area.
10. City of Colorado Springs, Code of Ordinances Title 13 Public Services: Colorado Springs public-services code is where city sewer and utilities discharge rules live for customers of Colorado Springs Utilities.
11. City of Boulder, Municipal Code Title 11 Water: Boulder Title 11 contains the city's water and wastewater code, including discharge rules that support local interceptor and FOG control.