Catch the spill before it spreads

If you store liquids in IBC totes, at some point an inspector, an insurer, or your own safety program is going to ask about secondary containment. It is one of the most misunderstood requirements in the yard, and getting it wrong is expensive, in fines, in cleanup, and in liability. This is a plain-language primer. It is not legal advice; your specific obligations depend on your product, volume, and jurisdiction.

What Secondary Containment Actually Is

Primary containment is the tote itself, the bottle holding the liquid. Secondary containment is the backup: a physical barrier that catches the liquid if the primary container leaks, cracks, or overflows. In practice that means:

• Spill pallets, a molded base with a sump underneath and a grate on top; the tote sits on the grate and any leak collects in the sump.
• Containment berms, a bermed or curbed area, portable or built-in, that holds spilled liquid.
• Containment buildings or vaults for larger installations.

The point is simple: if the tote fails, the liquid has somewhere to go besides the storm drain, the soil, or the shop floor. Purpose-built spill pallets are the most common solution for one to a few totes and appear in our accessories line.

When It Is Required

Several overlapping frameworks can trigger a containment requirement. The big ones:

• EPA SPCC (Spill Prevention, Control, and Countermeasure). If you store oil, including many oils, fuels, and oil-based products, above threshold quantities and could reasonably discharge to navigable waters, you likely need an SPCC plan with secondary containment.
• EPA hazardous waste rules (RCRA). Containers of hazardous waste have their own containment and inspection requirements.
• Local fire code (often based on the IFC). Storing hazardous materials, flammables, or corrosives above certain quantities triggers containment and other controls enforced by your local fire authority.
• Stormwater permits and local ordinances. California in particular takes stormwater contamination seriously, and municipal rules can be stricter than federal ones.

The safe assumption: if the liquid would harm soil, water, or people on release, plan for containment even before someone requires it. It is cheaper than a cleanup.

For a product-by-product read on what you are storing, our chemical and industrial overview and the FAQ are good starting points, but always confirm with your local fire marshal and environmental authority.

The Sizing Rule: 100% Plus Freeboard

Here is the number that trips people up. Secondary containment must hold at least the volume of the largest single container it serves, not a fraction, the whole thing, plus a margin called freeboard to account for rain, firefighting water, or displacement.

• Sizing is 100% of the largest container, so for a single 275 or 330-gallon tote, your containment must hold that full volume.
• Add freeboard, commonly figured to handle a design rainfall event for outdoor units, plus a safety margin. Many jurisdictions expect roughly 10% or more above the container volume.
• When multiple totes share one containment area, you generally size to the largest single tote, not the sum, but confirm, because some rules and some hazardous-waste scenarios require more.

A common rookie error is buying a spill pallet rated below a full tote. Check the sump capacity on the spec sheet against your tote volume from our size chart before you buy.

Choosing the Right Equipment

Match the containment to the product and the site:

• Chemical compatibility. A polyethylene spill pallet handles most water-based and many chemical products; verify compatibility for aggressive or oxidizing materials.
• Indoor vs. outdoor. Outdoors, you must account for rainwater filling the sump, so size freeboard accordingly and manage accumulated water.
• Single vs. multi-tote. Two-tote and four-tote pallets exist; berms suit larger arrays.
• Forklift access and drainage. Make sure you can still move totes and that you have a compliant way to remove captured liquid.

Inspection and Housekeeping

Containment is not a set-and-forget purchase. To stay compliant and effective:

• Inspect sumps and berms on a schedule and keep them empty, a sump full of rainwater has no capacity left to catch a spill.
• Document inspections; SPCC and RCRA both expect records.
• Watch the primary containers too. A cracked or UV-degraded bottle is the leak your containment is waiting for, rotate tired units through reconditioning before they fail.
• Train staff on spill response and keep absorbents nearby.

The Bottom Line

Secondary containment comes down to three questions: does my product require it, is my containment sized to at least 100% of the largest tote plus freeboard, and is it inspected and kept empty. Get those right and you are ahead of most yards. If you need compliant spill pallets, replacement bottles, or help thinking through a storage layout, our team can help, start at contact, and if you are unsure which grade of tote suits your product, review our grades guide first.