A comprehensive reference for southwestern-Ontario farms. What the dye does and doesn’t do, where coloured diesel can legally go, the regulatory frame in plain terms, the penalty ladder, on-farm tank storage, the spill-response trigger, and the enforcement reality the Ministry actually runs.
If you operate a farm in southwestern Ontario, coloured diesel is probably already part of how you run. Tractors, combines, grain dryers, gensets — they burn the marked fuel that the farm-plated pickup can’t legally use.
The rules around it are not complicated. They are, however, specific, and the cost of getting them wrong is structured to make a Ministry of Finance auditor’s afternoon, not yours. This article is the plain-language reference: what coloured diesel is, where it can and can’t go, the regulatory frame, what an on-farm tank actually has to be, what to do if there’s a spill, and what enforcement actually looks like.
Everything below is grounded in primary sources — the Fuel Tax Act, R.R.O. 1990 Reg. 464, the Ontario Ministry of Finance’s Coloured Fuel and Attention Truckers bulletins, the Ontario Fire Code, and OFA’s on-farm fuel-storage guidance. Where the published sources disagree, that disagreement is flagged rather than papered over.
Coloured diesel is ordinary middle-distillate diesel that a registered dyer has marked red. The dye is injected at a prescribed concentration — 170 to 190 parts per million — under the Fuel Tax Act and R.R.O. 1990, Regulation 464. The chemistry and combustion are identical to clear diesel. An engine cannot tell the difference between the two; the dye is a tax marker, not a fuel additive.
The reason the dye exists is that Ontario applies a fuel tax to clear diesel — currently 9.0 ¢/L, permanently set effective July 1, 2025 — and exempts coloured diesel from that tax. The dye is the visible marker that tells a roadside inspector whether the right tax has been paid on the fuel in a vehicle’s tank.
Only dyers who are registered with the Ministry of Finance may inject the dye, and only at the prescribed concentration. Importing coloured fuel into Ontario without that registration, or selling fuel that hasn’t been properly coloured, is itself an offence under the Act.
A typical southwestern-Ontario grain operation will burn coloured diesel in several places: in the tractor and the combine through the field season, in the grain dryer through harvest, sometimes in standby gensets, and in stationary equipment like irrigation pumps and grain augers. The savings versus clear, at 9.0 ¢/L of fuel tax, are real enough that the bookkeeping discipline the Act demands is worth keeping.
What you do not burn it in is the farm-plated pickup. That is the single hardest-edged rule in the entire regime, and the next section is about it.
The Ministry of Finance frames eligibility in terms of what coloured fuel may be used for. The full statement from the Coloured Fuel bulletin is:
Coloured fuel may be used for any reason other than to generate power in a licensed motor vehicle or when a motor vehicle or vessel … is operated principally for pleasure or recreation.
Inside that frame, the permitted uses for a farm are:
There are two narrow special-population exceptions that don’t typically apply on a farm:
For the rest of us, the rule is simpler than the bullet list makes it look: if it’s not licensed under the Highway Traffic Act, and it’s being used for work and not pleasure, coloured diesel is fine.
Fuel Tax Act s. 2(7.1) is the bright-line rule:
No person shall place or cause to be placed any unauthorized fuel in a fuel tank of a motor vehicle to which a number plate is attached as required under the Highway Traffic Act.
The Ministry’s commentary leaves no room for the operating-context arguments people sometimes wish were available:
It is prohibited to use coloured fuel in a licensed motor vehicle, even if the motor vehicle is operated primarily in connection with a farming, construction, forestry, or mining business.
A farm plate is a Highway Traffic Act number plate. The Ontario Federation of Agriculture confirms there is no exemption for farm-plated trucks from licensed-vehicle rules in this area. The plate is a reduced-fee commercial plate, not a category that escapes the Act. The result is categorical: coloured diesel does not belong in a farm-plated truck under any operating condition — not on the farm, not on a public road, not between two contiguous farm parcels, not on a short hop to the elevator.
This is the rule most likely to bite a customer who got bad advice somewhere along the way. There is no carve-out. The truck runs clear; the tractor runs coloured.
There is one practical exception inside the licensed-vehicle prohibition: a licensed truck may use coloured fuel for auxiliary equipment if — and only if — that auxiliary equipment is fed from a fuel tank that is physically not connected to the truck’s drive engine.
The typical case is a refrigeration (reefer) trailer on a licensed truck. If the reefer unit has its own dedicated diesel tank, that tank may be filled with coloured fuel, because the use is a non-taxable refrigeration use, not propulsion of the licensed vehicle. The same principle applies to certain PTO units with separate fuel supply.
The carve-out fails the moment the auxiliary equipment shares a tank with the propulsion engine. A single cross-feed line invalidates it. The Ministry’s enforcement test is a dip on the propulsion tank — and any dye there is the offence, regardless of the operator’s intent.
The legal architecture is shorter than it sounds.
A note for anyone who has seen older copy: the regulation is R.R.O. 1990, Reg. 464, not “O. Reg. 649.” The latter citation is wrong wherever it appears, and the Ministry’s consolidated guidance is at Reg. 464 (consolidation last updated May 1, 2014, last amended by O. Reg. 124/14).
The Act and Reg. 464 between them say what the rules are. They do not, on their own, tell you what a tank has to look like in a farmyard — for that, you look to the Ontario Fire Code and the Liquid Fuels Handling Code, both covered later in this article.
The Ministry’s recordkeeping requirement is straightforward and worth quoting verbatim:
Receipts and other records must be kept for 7 years.
For bulk purchases, those records must show:
The Act puts the burden of proof on the purchaser. If a Ministry auditor reassesses a farm operation and the records aren’t there to show that the right product was supplied for the right use, the assessment stands.
In practice the bulk-supply receipt from a wholesale distributor is the document that satisfies this — provided it carries the fields above. The farm’s own internal record is whichever filing approach works year-round: a binder per crop year, a spreadsheet, the supplier’s portal. The discipline is what matters; the format is yours.
The penalty stack inside the Fuel Tax Act is layered. The headline numbers — the $1,000,000 / 2-year ceiling, the 3×/10×/13× tax multipliers — sound dramatic in isolation; they’re less dramatic when you see how they map to specific conduct. Going from least to most serious:
For a first occurrence of improper use of coloured fuel — most commonly, dye in the tank of a licensed motor vehicle — the Ministry initiates a Provincial Offences Act Certificate of Offence. The set fine applies under the POA Set Fines schedule maintained by the Ontario Court of Justice.
A note on the dollar amount: the Ministry’s two published pages disagree. The Attention Truckers pamphlet states $440; the Coloured Fuel overview page lists $465. The Ontario Court of Justice Set Fines schedule is the authoritative source and prevails over either Ministry page in isolation. Until the OCJ schedule is pulled directly, the prudent posture is to frame the meaningful exposure around the tax back-charge ladder below, not around the disputed set-fine number. That’s how this article handles it.
The real exposure on improper use is the tax back-charge:
| What happened | Where the multiplier lives | Multiplier on tax that would have been payable as clear |
|---|---|---|
| First-occurrence improper use | Ministry Coloured Fuel bulletin, FTA penalty framework | 3× the tax |
| Subsequent improper use | Ministry Coloured Fuel bulletin | 10× the tax |
| Administrative reassessment on audit (improper use or tampering) | Fuel Tax Act, per Ministry bulletin | up to 13× the tax |
The “tax” in those multipliers is the road tax that would have been owed on the volume in the tank had it been supplied as clear. Payment of any fine or penalty does not extinguish the underlying tax liability — the back-tax is owed in addition to the penalty.
A separate exposure applies if you refuse to permit an inspection: up to $1,000 per refusal, under the Fuel Tax Act. The pragmatic posture is to cooperate with a dip-test — refusal multiplies trouble, and the test itself takes minutes.
The ceiling of the Act lives at s. 4.19(1). Tampering with coloured fuel — altering its colour, removing the dye, or tampering with seals or labels — and selling coloured fuel as clear, or unauthorized colouring, carry a fine of up to $1,000,000 and/or up to 2 years imprisonment.
For a registered dyer who refuses or neglects to colour fuel as required, the dedicated penalty under s. 4.19(1) ranges from $50,000 to $1,000,000. This is the most serious end of the Act and is structured to deter commercial-scale evasion, not occasional farm-level mistakes.
A note worth making explicitly: there is no section of the Fuel Tax Act that authorizes plate suspension or driver-licence suspension as a direct penalty for coloured-fuel misuse. A plate or licence can be suspended for unpaid POA fines via the generic Provincial Offences Act s. 69 default-fine pathway and Highway Traffic Act s. 46.2, but that is a default-on-an-unpaid-fine mechanism, not a Fuel Tax Act penalty for the underlying conduct.
The enforcement posture is administrative, not litigated.
The Ministry of Finance’s own page on inspectors describes the program in operational terms:
Inspectors sample the fuel tanks of diesel vehicles under the coloured fuel program to identify operators who may be avoiding fuel tax … Inspectors conduct regular visits to locations with fuel storage facilities, bulk plants, and service stations to ensure taxes have been paid on products used in licensed vehicles and to detect any misuse of tax exempt product.
The inspectors are Provincial Offences Officers, run out of the Ministry of Finance’s Investigations and Inspections Branch. They operate marked enforcement vehicles. The dip-test happens in three places:
There is also the paper audit. The seven-year retention requirement means a Ministry auditor doesn’t need to be standing in your yard to assess your operation — the records themselves can be reviewed at a desk, with the assessment coming after.
A targeted CanLII search of Ontario Court of Justice and Tax Court decisions in the 2020–2026 window finds no reported decision involving a farmer, custom operator, or trucker for coloured-fuel misuse. That isn’t evidence of low enforcement. POA-level convictions are typically not reported on CanLII, and the more common Ministry path is administrative reassessment — a Notice of Assessment plus penalty, with the taxpayer’s recourse being a Notice of Objection under FTA s. 28 / 29, not a criminal proceeding. The absence of court decisions doesn’t mean enforcement is light; it means enforcement runs through assessments, not courtrooms.
The audit triggers the Ministry publishes openly are short:
Beyond those, the Ministry doesn’t publish specific thresholds. The lesson for farm operators is plain: keep your tanks labelled, keep your receipts complete, and don’t mix products in a tank.
The Voluntary Disclosure pathway exists precisely for the “discovered after the fact” case — a tank you didn’t realize was contaminated, a supplier delivery that crossed wires, a previous owner’s residue. The Ministry of Finance’s Voluntary Disclosure bulletin permits a taxpayer to come forward and correct a Fuel Tax Act non-compliance before the Ministry initiates an audit, in exchange for waiver or reduction of penalties. The underlying tax still owes.
Conditions: the disclosure must be voluntary (not made under audit notice), complete (full disclosure of the issue), and on an issue not already known to the Ministry. If a customer discovers dye in a licensed-vehicle tank after the fact, the operational sequence is: drain immediately, document, dispose per environmental rules, and consider Voluntary Disclosure with the help of a tax advisor.
The tank itself is the other half of the compliance picture. The good news for a farmer adding or upgrading a bulk coloured-diesel tank is that the regime is well-defined and the installer carries most of the certification burden. The bad news is that the popular shorthand “TSSA-registered tank” is wrong for most farm cases, and the right answer involves three separate documents.
A few things often get confused into this and shouldn’t be:
Diesel is a Class II combustible liquid for Fire Code purposes. The Code, Part 4 (Flammable and Combustible Liquids), Section 4.3 (Storage Tanks), is where the operational requirements live. For tanks ≤50,000 L — which covers the overwhelming majority of farm bulk tanks:
The Liquid Fuels Handling Code requires installation of farm bulk tanks (and the associated pumps, hoses, and supports) by a TSSA-certified Petroleum Mechanic. This is the operative compliance touchpoint when a farmer adds or moves a bulk coloured-diesel tank. Boucher & Jones handles this through certified-mechanic installers as a standard part of any new-tank or replacement program.
The labelling on a coloured-fuel tank has two distinct sources, and both apply:
Ministry of Finance-issued labels and tags. Statutory under the Fuel Tax Act and Reg. 464. The Ministry “issues labels and tags … to be used by any person who owns or operates any equipment used to colour, store, transport or deliver coloured fuel. Each identifying label or tag must be placed in a location where it is clearly visible under normal operating conditions.” Order via the Ministry’s general line — 1-866-ONT-TAXS (1-866-668-8297). B&J supplies these at install.
CFA Colour-Symbol System markings on the tank exterior. Adopted by reference in Ontario Fire Code s. 4.3.1.7(1). Under the Canadian Fuels Association’s Using the Canadian Fuels Colour-Symbol System, dyed/non-taxed diesel uses a red product-identification band and clear diesel uses a white band. Worth noting: the colour scheme is enforceable in Ontario through the Fire Code’s reference, but the colours themselves come from the CFA industry document, not from the Fuel Tax Act or Reg. 464. The chain is Fire Code → CFA, not Act → label colour.
Underground storage tank systems do require TSSA registration, regardless of farm or non-farm context. Per TSSA FAQs: Storage Tanks, underground systems must be registered, inspected on TSSA’s underground-tank inspection cycle, and decommissioned per TSSA-approved procedure when removed. Underground tanks are uncommon on farms today but exist in legacy installations and on properties that were previously commercial. If you have one, the registration and inspection obligations apply.
A diesel spill on a working farm is governed by the Environmental Protection Act, R.S.O. 1990, c. E.19, s. 92. The reporting trigger is functional, not volumetric.
There is no minimum litreage below which a spill is non-reportable. The decision turns on where the spill is going and what it can affect:
A 20-litre spill into a tile drain is reportable. A 1,000-litre spill fully contained inside an intact secondary-containment dike is not (though good practice is to report and document anyway). The number itself is not the trigger.
When the trigger is met, call the Spills Action Centre at 1-800-268-6060 immediately. The Centre runs 24/7. State your name and location, what spilled, the estimated volume, and where it is going. The dispatcher will issue an incident or ticket number — keep that on the same record where you document the rest of the response.
The operational sequence for any spill, in order:
A note that occasionally needs repeating: the federal Storage Tank Systems for Petroleum Products and Allied Petroleum Products Regulations (SOR/2008-197) applies only to federally-jurisdiction tanks. A private farm’s spill is governed by Ontario’s EPA s. 92 and the Spills Action Centre, not by federal spill rules.
Auditor General context worth knowing about, for the record: the AG’s 2021 Value-for-Money Audit: Hazardous Spills — restated verbatim in the 2023 Annual Follow-Up, Section 1.21 — found that between 2016 and 2020, 3,746 of 40,349 reported spills (9%) were not reported until the following day, and 505 spills took more than 10 days to report. Late reporting is itself an offence under the EPA. The “call first, document later” instinct is the right one.
No. A farm plate is a Highway Traffic Act number plate, and Fuel Tax Act s. 2(7.1) prohibits coloured fuel in any HTA-plated vehicle. The Ministry’s commentary is explicit that the prohibition applies even when the vehicle is operated primarily in the farming business. There is no between-parcels carve-out, no short-hop allowance, no on-farm-only exception. The truck runs clear; the tractor runs coloured.
You receive a POA Certificate of Offence with a set fine under the OCJ Set Fines schedule, plus the Ministry will assess the tax back-charge: 3× the tax owed on a first occurrence, 10× on subsequent occurrences. Administrative reassessment penalty on audit can reach 13× the tax. The underlying tax is owed on top of the penalty.
Two layers. The Ministry of Finance issues identifying labels and tags under the Fuel Tax Act and Reg. 464 — these are the small statutory tags that go on the coloured-fuel storage and dispensing equipment. The red-and-white colour-band scheme on the tank exterior is a separate layer, sourced to the Ontario Fire Code s. 4.3.1.7(1)’s reference to the Canadian Fuels Association Colour-Symbol System. Both apply; both are required.
For an aboveground farm tank, no. The Ontario Federation of Agriculture confirms there is no requirement to register the tank itself. What is required is that installation be by a TSSA-certified Petroleum Mechanic under the Liquid Fuels Handling Code. The certification touchpoint is the installer, not the tank registry. Underground tank systems are a different regime and do require TSSA registration.
Dye is injected at 170 to 190 parts per million, by a dyer registered with the Ministry of Finance, under R.R.O. 1990 Reg. 464. Importing coloured fuel into Ontario, or selling fuel as coloured when it has not been properly dyed by a registered dyer, is itself an offence under the Act.
Drain immediately to halt the offence. Document what you found, when, and what you did. Dispose of the contaminated fuel through a licensed hauler (mixed coloured/clear is not usable in a licensed vehicle anyway). Consider the Ministry of Finance’s Voluntary Disclosure pathway — it permits a taxpayer to come forward and correct a Fuel Tax Act non-compliance before the Ministry initiates an audit, in exchange for waiver or reduction of penalties (the underlying tax still owes). The pathway requires the disclosure to be voluntary, complete, and on an issue not already known to the Ministry. A tax advisor is usually the right next call.
A few claims that appear elsewhere in the trade conversation are not in this article because the verified primary sources don’t support them at present:
The article will be updated when any of these positions changes — either because new primary sources turn up or because the OCJ Set Fines schedule is captured directly and the dollar number can be cited cleanly.
A named rep takes the call, not a queue. Tell us about your operation — we’ll sort coloured diesel, clear diesel, propane, and DEF in one conversation.
Standing routes across nine regions. Same rep year-round; off-hours emergency dispatch through the same number.
Marketing Intelligence by Candid