Verdict: aboveground farm diesel tanks are not TSSA-registered, but a stack of installation, code, and Fire Code requirements applies. Many farmers ask whether their bulk coloured-diesel tank needs to be "TSSA-registered." The short answer is no for aboveground; yes for underground. The longer answer is the Liquid Fuels Handling Code (LFHC) under O. Reg. 217/01 plus Ontario Fire Code Part 4 govern installation, setbacks, secondary containment, and labelling.

What does NOT apply

• TSSA tank registration for aboveground farm tanks. Per OFA, On-Farm Gasoline and Diesel Fuel Storage (ofa.on.ca/resources/farm-gasoline-diesel-fuel-storage/, current July 2024 edition): "REGISTRATION — There is no requirement to register farm tanks. However, tanks and associated equipment (pumps, hoses and supports) must be installed by a certified Petroleum Mechanic in accordance with the LFHC."
• Federal SOR/2008-197 (Storage Tank Systems for Petroleum Products and Allied Petroleum Products Regulations). Per s. 2(1) of the regulation: applies only to systems operated by a federal department/board/agency; operated by/belonging to a federal work or undertaking; on federal or Aboriginal lands; or operated by a federal Crown corporation. Private farms in Southwestern Ontario sit entirely under provincial jurisdiction. The federal regulation does not bite. (Farmers occasionally hear about SOR/2008-197 and assume it applies; it does not.)
• O. Reg. 213/01 (Fuel Oil) for the on-farm diesel bulk tank itself. That regulation governs fuel oil for heating/burning equipment under CSA B139. On-farm diesel bulk tanks for off-road equipment use are governed primarily by the LFHC under O. Reg. 217/01 Liquid Fuels and the Ontario Fire Code Part 4. The popular conflation of "fuel oil" with "farm diesel tank" is wrong. A farmhouse heating-oil tank is a different system under O. Reg. 213/01.

What DOES apply (Ontario Fire Code Part 4, diesel = Class II combustible liquid)

From the Ontario Fire Code, Part 4 (Flammable and Combustible Liquids), Section 4.3 Storage Tanks, and OFA's farm-focused summary:

• Setbacks (tanks ≤50,000 L): at least 1.5 m from a building on the same property and 3 m from the property line.
• Secondary containment (Section 4.3.7): required for aboveground tanks with capacity >5,000 L, OR for any size where a release could enter a sewer system, underground stream, or drainage system. Double-walled tanks ≤80,000 L are accepted as equivalent to a dike.
• Containment capacity: at least 110% of the largest tank in the contained space; secondary containment walls noncombustible, permeability ≤10⁻⁶ cm/s to the stored liquid.
• Bollards / vehicle-impact protection required where vehicle traffic could strike the tank.
• Approved tanks only: ULC-certified, ULC sticker visible.

Installation — petroleum mechanic required

The LFHC requires installation of farm bulk tanks (and associated pumps, hoses, supports) by a TSSA-certified Petroleum Mechanic. This is the operative compliance touchpoint for a farmer adding or moving a bulk coloured-diesel tank: hire a TSSA-certified PM. See service-tank-installation for the B&J side of this.

Labelling — Ministry of Finance + CFA Colour-Symbol System

Two layers, both required:

1. Ministry of Finance-issued labels and tags for coloured-fuel storage (statutory under Fuel Tax Act + Reg. 464). Order via 1-866-ONT-TAXS. See op-tank-labelling-colour-scheme.
2. CFA Colour-Symbol System identification for product type at the dispenser (red band for coloured/dyed diesel; white band for clear diesel). Adopted by reference in Ontario Fire Code s. 4.3.1.7(1). See op-tank-labelling-colour-scheme.

Underground tanks — different regime

Underground storage tank systems do require TSSA registration regardless of farm or non-farm context. Per TSSA FAQs: Storage Tanks (tssa.org/faqs-storage-tanks): underground systems must be registered, inspected on TSSA's UST inspection cycle, and decommissioned per TSSA-approved procedure when removed. See service-tank-decommissioning.

TSSA Fuel Oil Distributor Audit Program (peripheral)

For farmhouse heating-oil (not the off-road diesel bulk tank), TSSA introduced a Fuel Oil Distributor Audit Program in 2020 under O. Reg. 213/01 (tssa.org/fuel-oil). The distributor must inspect the tank — including a comprehensive inspection at least once every 10 years of all aboveground and underground fuel-oil tanks delivered to. If unacceptable conditions create an immediate hazard, the distributor must stop supplying. The farmer's practical obligation is to arrange annual maintenance with a TSSA-certified oil burner technician and to allow the distributor's inspection. This is a heating-oil regime, not a farm-diesel-bulk-tank regime — keep them separate in any customer-facing copy.

Sources & structured attribution

• source.document: Ontario Federation of Agriculture, On-Farm Gasoline and Diesel Fuel Storage (ofa.on.ca/resources/farm-gasoline-diesel-fuel-storage/, July 2024 edition); Ontario Fire Code Part 4, Section 4.3 Storage Tanks (ontariofirecode.com/ontario-fire-code/division-b-acceptable-solutions/part-4-flammable-and-combustible-liquids/section-4-3-storage-tanks/); O. Reg. 217/01 Liquid Fuels; Liquid Fuels Handling Code (TSSA, current edition); TSSA FAQs: Storage Tanks (tssa.org/faqs-storage-tanks); TSSA Fuel Oil Distributor Audit Program (tssa.org/fuel-oil); Storage Tank Systems for Petroleum Products and Allied Petroleum Products Regulations SOR/2008-197 s. 2(1) (laws-lois.justice.gc.ca/eng/regulations/SOR-2008-197/, current to 17 March 2026)
• source.section: OFA registration paragraph; Fire Code 4.3.1.7, 4.3.7; SOR/2008-197 s. 2(1); LFHC installation provisions
• source.captured_date: 2026-05-13
• source.confidence: verified (Fire Code numbers, OFA fact sheet, SOR/2008-197 scope); inferred (LFHC vs Fuel Oil regime separation — not directly stated by any single source, derived from cross-reading)
• concept_category: regulatory compliance / tank installation / on-farm storage
• applies_to_services: bulk-diesel tank install/upgrade; on-farm tank inspection; coloured-fuel delivery
• applies_to_audiences: farm customers installing or upgrading bulk diesel storage; B&J ops staff doing tank installs

Confidence: verified (Fire Code values and SOR/2008-197 scope are primary-source confirmed; LFHC-vs-fuel-oil separation is inferred from cross-reading and worth re-validating before any contentious customer claim).