Last updated 2026-08-19
TL;DR
Colorado does not sell a statewide grease trap license. Register the company with the Secretary of State, get a free IRS EIN, then follow the city or sanitation district that owns the sewer. County systems-cleaner rules apply if you pump on-site tanks. Lock a legal disposal outlet before you buy a truck. Confirm every fee and wait time with the board that signs. Pumping is not installing.
Do you need a license for grease trap in Colorado?
No. Colorado does not issue a single statewide grease trap hauler license. You still need real paper, and plenty of it. Most people need a Secretary of State entity, a free IRS EIN, a local business license where you park and bill, and written acceptance from the plant or processor that will take the waste.[5][6]
Pump restaurant interceptors on city sewer and the pretreatment program at that utility is the board that matters. Federal rules already tell that utility it must stop pass through and interference. 40 CFR 403.5(a)(1) says, "A User may not introduce into a POTW any pollutant(s) which cause Pass Through or Interference."[1] Grease is how a lot of that interference starts. Cities then write FOG rules you have to live with.
Clean on-site tanks too (septic, vaults, some rural interceptors) and that is a different stack of paper. Regulation 43 (5 CCR 1002-43) puts systems cleaners under local public health agencies.[8] Many counties register or license pumpers. They do not copy each other. Call each county you will cross.
Installing a new interceptor is plumbing. The State Plumbing Board at DORA polices who may install.[12] Pumping an existing tank is not that license. People mix those two up and stall for months.
Skip the "Colorado grease license course" from a random site. There is no state exam for this work. Spend the time getting the hauler packet from each pretreatment office. Get a name. Get a phone number. That is the real path. For the license question in one place, see grease trap license in Colorado.
A Colorado grease starter who skips the utility conversation does not have a business. He has a truck and a liability.
How much does grease trap cost in Colorado?
The cheap part is the state filing. The expensive part is the truck, insurance, and dump fees. Colorado Secretary of State entity filings are listed on the state fee schedule, and you should confirm the current Articles of Organization amount before you pay.[6] An IRS EIN is $0 if you apply on the IRS site.[5]
I have no honest statewide price list for pumping a trap or for buying a vacuum truck. Nobody publishes a clean Colorado index for this. Used vacuum trucks trade from the tens of thousands into six figures depending on year, tank size, and whether the pump still holds a vacuum. New units run higher. Confirm current asking prices with dealers. Do not budget off a blog number from 2019.
Local business licenses vary by city and county. Some are cheap. Some add sales tax licensing if you sell a taxable service. Confirm with the Colorado Department of Revenue whether your mix of pumping, surcharges, and any oil sales needs a sales tax account.[7]
Insurance will dwarf the state paper. Commercial auto on a loaded vac truck is the first real invoice. If you haul brown grease, ask a broker about pollution liability. I would buy that policy before I bought vinyl wraps.
Disposal is the line that makes or breaks a bid. Plants and processors charge by gallon or by load, and they change those numbers. Price every job from the dump fee plus drive time, not from what a national franchise advertises.
Are you the restaurant, not the hauler? Then interceptor install cost is a plumbing bid plus the city permit. That is a licensed plumber job in Colorado, not a handyman special.[12] I would get two plumbing bids and read the utility's interceptor sizing sheet before I signed anything.
How long does grease trap take in Colorado?
The entity and EIN can be fast. Online Secretary of State filings often post quickly, and the IRS EIN application can return a number the same day if the site is up.[5][6] That is not permission to pump.
Utility hauler packets, county systems-cleaner cards, insurance binders, and truck acquisition are what eat the calendar. I will not quote a statewide processing time because each board runs its own desk. Confirm current wait times with the pretreatment coordinator and the county health agency you actually need.
Buying a truck can take longer than every form combined. Shops are slow. Inspections find leaks. Do not promise restaurants a start date until the tank is legal on the road and a dump site has said yes in writing.
A first paying route in a Front Range city is often a matter of weeks to a few months if your paperwork is clean and you already have a truck. Rural multi-county work takes longer because you stack county rules. No one can guarantee approval or a date. A salesperson who promises a date is selling, not filing.
What papers do you file first with the state and the IRS?
File the company first. Pick an entity that matches how you want to be taxed, then file with the Colorado Secretary of State. Most small operators use an LLC. Read the state's LLC pages and the current fee schedule before you click pay.[6]
Then get an EIN. The IRS says you can apply online, and that application is free.[5] Do not pay a reseller for an EIN. That is money in the trash.
After that, ask the Department of Revenue if you need a sales tax license for what you will actually invoice.[7] Pure wastewater hauling is not the same as selling yellow grease or parts. The tax answer follows the invoice, not the truck color.
Hiring employees? Register for wage withholding and unemployment, and buy workers' compensation. Colorado expects employers to carry workers' compensation coverage for employees.[9] A one-person shop with no employees is a different fact pattern. Confirm that with CDLE, not with a Facebook group.
Trade names are optional. I would file one if you advertise under a name that is not the legal entity. Skip the logo until the EIN and the dump letter exist.
Neighbor-state paper is not Colorado paper. If you also plan to run into Arizona, read how to start grease trap in Arizona separately. Do not assume reciprocity.
Which city or utility actually controls grease trap pumping?
The sewer owner does. EPA's pretreatment program is how large treatment plants control commercial discharges, including FOG that clogs collection systems.[2] 40 CFR 403.8 is the federal rule that tells many POTWs they must run a pretreatment program.[15] Your daily boss is still the local coordinator.
On the Front Range that often means Metro Water Recovery plus the city that owns the collection lines. Denver, Aurora, Lakewood, Boulder, Fort Collins, and Colorado Springs each publish their own FOG or industrial pretreatment rules. Some require hauler registration. Some require a manifest on every pump-out. Some inspect the restaurant and only yell at you when the paperwork is sloppy.
Ask three questions on the first call. Do you register haulers. What form rides in the truck. Which receiving facilities will you accept waste from. Write the answers down. If they email a packet, keep the PDF with the date.
Do not treat a Denver approval as a Colorado Springs approval. It is not.
Smaller mountain towns may have almost no FOG desk and still have a public works superintendent who can shut your day down. Call them anyway.
Want a side-by-side of how another western state splits this work? Grease trap license in Arizona is a useful contrast. Colorado stays more local.
Do you need a plumber license to install a grease trap in Colorado?
Yes, if you are installing or replacing the interceptor. Pumping it is a different job. The Department of Regulatory Agencies State Plumbing Board publishes the laws and rules that limit who may perform plumbing.[12]
I would not open a grease trap shop by bidding new outdoor interceptors unless a licensed plumber is on the job. Cities will not pass the inspection because you own a vac truck. They pass it because a licensed plumber pulled a permit and the interceptor matches the utility's sizing sheet.
Hydromechanical units inside a kitchen and big gravity interceptors in the parking lot are not the same install. The utility often cares more about the outdoor gravity unit. Read their FOG guidance before you quote steel.
A restaurant asks you to "just drop in a new trap"? Send them to a plumber and bid the first pump after inspection. That keeps you inside your lane.
Unlicensed install work is how you meet an investigator. It is also how you eat a failed inspection for free. Skip it.
What CDL and truck rules apply to a grease trap route?
A single-vehicle grease route crosses the federal CDL line at 26,001 pounds GVWR under 49 CFR 383.5.[3] 49 CFR 383.5 defines a commercial motor vehicle, in part, as a vehicle that "Has a gross vehicle weight rating or gross vehicle weight of 26,001 pounds or more, whichever is greater."[3] Most serious vac trucks sit over that line. Many starter "slide-in" units sit under it. Weigh the actual truck. Do not guess from the brochure.
Colorado issues CLP and CDL credentials through the state DMV. Confirm current medical card, skills test, and endorsement rules on the DMV commercial pages before you schedule anything.[10]
Ask FMCSA whether your operation needs a USDOT number. For-hire hauling and many commercial weights trigger registration even when you never leave Colorado. The FMCSA explainer is the place to start, then confirm any Colorado motor carrier piece with CDOT or Motor Carrier Services.[11]
I would not put a homemade tank on a one-ton and hope. Weld quality, baffles, PTO, and a working vacuum pump matter more than paint. A cheap tank that vents into the cab will end your week.
Interstate work adds UCR, IRP, and IFTA if you cross state lines with a qualifying vehicle. Stay in-state until that paperwork is boring.
Where can you legally dump grease trap waste in Colorado?
Only where the receiving facility said yes. Brown grease (interceptor waste) is not the same product as yellow grease (fryer oil). Plants that take one often refuse the other. Landfills may treat dewatered grease as special waste under Colorado solid waste rules. Confirm that path in 6 CCR 1007-2 and with the landfill's special waste desk before you drive there.[13]
I would lock two outlets before I signed a restaurant. One plant will go down for maintenance. One processor will change acceptance rules. If your only dump site is a handshake, you do not have a route.
Some Colorado wastewater plants take FOG by appointment and require a generator name, volume, and a signed manifest. Some will not take grease from outside their service area. Ask. Get it in email.
Land application of greasy septage is not a casual backup plan. Regulation 43 and local health rules sit on OWTS waste, and you do not improvise a field dump because the plant closed at 3 p.m.[8]
Rendering companies want clean yellow grease. They will reject a load that smells like a trap. Keep those streams in different tanks if you do both jobs.
This is the part national "start a grease route" videos skip. Disposal capacity, not the LLC, is the scarce thing along the Front Range.
What insurance and OSHA rules hit a first-year operator?
Have employees? Budget workers' compensation. CDLE tells employers they must carry it for covered workers.[9] Confirm exemptions with the Division, not with a forum post.
Commercial auto is non-negotiable on a loaded truck. General liability helps on property damage at the restaurant. Pollution liability is the policy people skip until the first spill in a creek-side parking lot. I would not skip it.
Confined space is the safety rule that actually kills people in this trade. OSHA 1910.146(a) states, "This section contains requirements for practices and procedures to protect employees in general industry from the hazards of entry into permit-required confined spaces."[4] A grease interceptor is a confined space. I would run the route so nobody enters the tank. Pump from the surface. If someone has to enter, you are in permit-required territory with air monitoring, an attendant, and a rescue plan. That is not a first-week skill.
Gloves, face shields, and a spill kit go on the truck before the second set of business cards.
Do not treat hydrogen sulfide like a smell joke. It is why you stay out of the tank.
How do you keep manifests and records a board can confirm?
Write down generator name, address, date, gallons, trap location, driver, truck, and receiving facility on every load. Keep a copy the restaurant can show an inspector. Keep yours for whatever retention the utility printed in its packet. If they did not print a number, ask.
Boards confirm facts. They do not confirm vibes. A dated manifest plus a plant ticket beats a text that says "got it."
Want blank interceptor logs and manifest sheets in one kit? GreaseTrapPath sells a $199 Interceptor + Manifest Kit. You can also build the same fields in a notebook. The notebook works if you actually fill it out.
Photograph the open interceptor before and after when the utility is picky. Store photos by account, not in a camera roll named "truck."
An inspector asks who pumped unit 2 last Tuesday. You should be able to answer without calling your cousin.
California haulers live in a heavier manifest culture. If you ever run west, how to start grease trap in California shows a stricter paper habit worth copying even when Colorado does not force it.
What should you skip spending money on in year one?
Skip the new truck if a sound used unit with a known pump hours log is for sale. Skip the wrap, the drone video, and a second shop location. Skip paying a consultant to "get you the Colorado grease license." That product is vapor.
Skip entering tanks. Skip bidding plumbing installs. Skip taking yellow grease and brown grease in the same tank.
Do spend money on a legal dump relationship, pollution coverage, a hose that does not burst, and a scale ticket habit.
A franchise pitch that wants a five-figure fee for "territory" in a city that does not grant exclusive FOG territories is a conversation I would leave. The utility does not care that you bought a map from a franchisor.
Still deciding where to base the truck? Compare startup friction in a lighter market. How to start grease trap in Arkansas is a different paper climate. It will not save you from Colorado dump fees if you stay here.
How do restaurant grease traps get approved on a Colorado job?
The restaurant (or its plumber) pulls a plumbing permit and follows the local utility's interceptor rules. You, the pumper, usually enter after the unit is in the ground. Know the approval path anyway, because restaurants will ask you to "just handle it."
Large treatment plants run pretreatment programs under 40 CFR 403.[2][15] Those programs set local FOG limits and often publish a sizing method. Some use drainage fixture units. Some use meals per day. Use their sheet, not a national rule of thumb.
Many Colorado cities also tell food service sites to pump on a schedule or when floating grease plus settled solids hit a percent of liquid depth. The common industry figure you will hear is 25 percent. That is a local rule when a city adopts it, not a Colorado statute. Confirm the number in the utility packet.
Here is the split that keeps people out of trouble.
| Work | Typical Colorado paper | Who confirms |
|---|---|---|
| Installing an interceptor | Licensed plumber and a local plumbing permit | DORA Plumbing Board and city building |
| Pumping a city-sewer interceptor | Entity papers, utility hauler rules, manifests | Local pretreatment program |
| Pumping OWTS or septic | Systems cleaner registration in many counties | Local public health under Regulation 43 |
| Disposing of the waste | Facility approval, special waste OK if landfilled | Receiving facility and CDPHE solid waste rules |
Want kit templates after you have the dump letter? Start at /start. GreaseTrapPath is an independent publisher, not a law firm and not a service company. Nothing here is an approval or a timing promise. Confirm fees, forms, and wait times with the board that signs.
Frequently asked questions
Do you need a license for grease trap in Colorado?
There is no single statewide grease trap hauler license. You need a Secretary of State entity, an IRS EIN, local business licensing, and whatever hauler registration the sewer utility or county health department requires. Installing an interceptor is plumbing and needs a licensed plumber. Confirm each piece with the board that actually signs.
How much does grease trap cost in Colorado?
State formation filings are modest and listed on the Secretary of State fee schedule. An EIN is free on IRS.gov. Real money goes to the truck, commercial auto, pollution coverage, and per-load dump fees. Nobody publishes a clean statewide pump-out price. Build every bid from your current dump ticket plus drive time, and confirm tax licensing with the Department of Revenue.
How long does grease trap take in Colorado?
The LLC and EIN can be quick online. Utility hauler packets, county systems-cleaner cards, insurance, and finding a legal truck take longer. There is no honest statewide processing clock. Confirm current waits with the pretreatment office and county health agency you need. Do not promise restaurants a start date until a dump site has said yes in writing.
Do I need a CDL to pump grease traps in Colorado?
You need a CDL if the truck meets the federal commercial motor vehicle definition, including a GVWR or GVW of 26,001 pounds or more under 49 CFR 383.5. Many full-size vac trucks sit over that line. Some small slide-in units sit under it. Weigh the real truck and read Colorado DMV CLP and CDL rules before you hire a driver.
Can I install grease interceptors without a plumber license?
No. New installs and replacements are plumbing work under the State Plumbing Board at DORA. A vac-truck certificate does not pull a plumbing permit. Bid the first pump after a licensed plumber and the city inspector sign the job. Unlicensed install work is how you meet an investigator and eat a failed inspection.
Where do I dump grease trap waste in Colorado?
Only at a plant, processor, or landfill that accepted your waste stream in writing. Brown grease and yellow grease are different products. Some Front Range plants limit outside waste or require appointments and manifests. Landfills may treat dewatered grease as special waste under 6 CCR 1007-2. Lock two outlets before you sell a route.
Is grease trap waste hazardous waste in Colorado?
Typical restaurant interceptor waste is managed as a special or liquid waste, not as listed hazardous waste. That changes if someone dumped solvents, fuels, or other listed materials into the tank. Do not guess. If a load looks wrong, stop and ask the receiving facility and, if needed, CDPHE. Mixing a bad load into a clean tank can close your dump door.
Do I need workers' compensation if I work alone?
Colorado requires employers to carry workers' compensation for covered employees. A true one-person company with no employees is a different fact pattern. Confirm your status with the Colorado Division of Workers' Compensation before you assume you are exempt. The moment you hire a helper, budget the policy.
What is the 25 percent rule for grease traps?
Many pretreatment programs tell restaurants to pump when floating grease plus settled solids reach about 25 percent of the liquid depth. It is a common utility rule, not a single Colorado statute. Some cities use a fixed pump interval instead. Read the packet for the sewer that serves that address and write the number on the account file.
How often must restaurants pump grease traps in Colorado?
There is no one statewide interval. The local utility sets the schedule or the 25 percent-style capacity trigger. Busy kitchens need more frequent service than a small cafe. Your job is to put the required interval on the invoice and keep a manifest the inspector can read. Confirm the current rule with that city or sanitation district.
Do I need a Colorado sales tax license to pump traps?
Maybe. It depends on what you invoice. Pure wastewater hauling, parts sales, and yellow grease commodity sales are not the same tax facts. Apply through the Department of Revenue only after you know what you will charge. Confirm on the sales tax license pages rather than copying another hauler's setup.
What is the difference between yellow grease and brown grease in Colorado?
Yellow grease is used fryer oil. Renderers buy it when it is clean. Brown grease is interceptor or trap waste mixed with wastewater and solids. Plants and specialized processors handle brown grease, and many renderers will reject it. Keep the streams in separate tanks. One bad mix can lose both outlets.
Do county septic pumper licenses cover city restaurant traps?
Usually not by themselves. County systems-cleaner credentials under Regulation 43 target on-site wastewater systems. City restaurant interceptors sit on municipal sewer and follow that utility's FOG program. If you do both jobs, carry both stacks of paper. Do not flash a septic card at a Denver pretreatment inspector and call it done.
Do I need a USDOT number for a Colorado-only grease truck?
Often yes once the vehicle is a commercial motor vehicle or you haul for hire, even if you never leave the state. Start with FMCSA's "Do I need a USDOT number" page, then confirm any Colorado motor carrier piece with CDOT or Motor Carrier Services. Interstate work adds more credentials. Get this straight before the first invoice.
Sources
- eCFR 40 CFR 403.5 National pretreatment standards: Prohibited discharges: 40 CFR 403.5(a)(1) prohibits a user from introducing into a POTW any pollutant that causes pass through or interference
- U.S. EPA Introduction to the National Pretreatment Program (EPA-833-B-11-001): EPA's national pretreatment program requires POTWs to control commercial and industrial discharges that can interfere with treatment works
- eCFR 49 CFR 383.5 Definitions (commercial motor vehicle): A commercial motor vehicle includes a vehicle with a GVWR or GVW of 26,001 pounds or more, which is the CDL threshold for many vac trucks
- OSHA 29 CFR 1910.146 Permit-required confined spaces: OSHA 1910.146 sets practices and procedures to protect employees from hazards of entry into permit-required confined spaces, which include interceptors
- IRS Apply for an Employer Identification Number (EIN) online: An EIN can be obtained online from the IRS at no charge
- Colorado Department of Revenue Sales tax license: Colorado businesses that make taxable sales must follow Department of Revenue sales tax license rules, which operators should confirm against their actual invoices
- Colorado Secretary of State CCR 5 CCR 1002-43 Regulation 43 OWTS: Regulation 43 (5 CCR 1002-43) is Colorado's on-site wastewater treatment system rule and is the framework local health agencies use for systems cleaners
- Colorado Department of Labor and Employment Division of Workers' Compensation employers: Colorado employers are directed to workers' compensation coverage requirements for employees through CDLE's Division of Workers' Compensation
- Colorado DMV commercial learner permit and commercial driver license: Colorado DMV publishes CLP and CDL requirements that apply when a grease truck meets commercial motor vehicle criteria
- FMCSA Do I need a USDOT number: FMCSA explains when a motor carrier or commercial vehicle operation must obtain a USDOT number, including many for-hire and CMV operations
- Colorado DORA State Plumbing Board laws, rules, and policies: The State Plumbing Board publishes the laws and rules that limit who may perform plumbing, including interceptor installation
- Colorado Secretary of State CCR 6 CCR 1007-2 Solid Waste Regulations: Colorado solid waste regulations (6 CCR 1007-2) govern landfill and special waste handling that can apply to dewatered grease
- eCFR 40 CFR 403.8 Pretreatment program requirements: Development and implementation by POTW: 40 CFR 403.8 requires many POTWs to develop and implement a pretreatment program that local FOG rules sit inside