Secondary Containment Selection Guide
Choosing the right spill pallet, sump platform, basin, berm, or IBC unit for drums and totes
Last updated: June 16, 2026
Overview
If you store drums of oil, fuel, solvent, or chemical totes, an inspector or insurer will eventually ask one question: what catches the spill when a container leaks? Secondary containment is the answer. It is the basin, pallet, platform, or berm that sits under your primary containers and holds the liquid before it reaches a floor drain, the soil, or a waterway.
The hard part is matching the right equipment to your situation. A single drum at a maintenance bench has very different needs than a four-drum staging area or a 275-gallon tote of process chemical. This guide walks through the five common containment formats, how to size the sump so it satisfies the federal capacity rule, when poly beats steel, and how to read your own setup so you buy once instead of twice.
This is spill prevention hardware, distinct from spill response. Containment keeps a release from spreading; absorbents and a spill kit clean it up after the fact. Most regulated sites need both. For the response side, see our hazmat spill kit selection guide. When you are ready to compare products, the spill containment collection lists the pallets, platforms, and IBC units in stock.
Why Containment Matters
Secondary containment exists to keep a leak from becoming a reportable release. A single 55-gallon drum that fails over a bare concrete floor can reach a trench drain in minutes, and from there a storm sewer or a creek. The cleanup, reporting, and potential penalties dwarf the cost of a pallet that would have caught it.
Three regulatory frameworks tend to drive the purchase. Knowing which one applies to you decides how much capacity you need and whether the unit has to be liquid tight.
EPA SPCC, 40 CFR Part 112
The SPCC rule applies to non-transportation facilities that store oil above threshold quantities and that could reasonably discharge oil to navigable waters or adjoining shorelines. Oil is defined broadly and includes petroleum, fuel, lubricants, and many oils of animal or vegetable origin. SPCC facilities must provide containment sized to hold the contents of the largest single container plus freeboard for precipitation where the area is exposed to weather. Drum and tote storage areas are a common containment point in an SPCC plan. See our EPA SPCC (40 CFR 112) requirements page for the 1,320 gallon threshold and largest-container sizing.
OSHA 1910.106 and NFPA 30
Flammable and combustible liquids carry their own storage and handling rules under OSHA 1910.106 and NFPA 30. These address spill control and drainage for liquid storage and dispensing areas. If you store gasoline, solvents, or other flammables in drums, your containment choice has to account for these rules in addition to SPCC.
State and local programs
Many states run their own hazardous material and stormwater programs that reference or exceed the federal baseline. Industrial stormwater permits often require containment for outdoor storage. Check with your state environmental agency, because a state rule can be the binding requirement even when the federal threshold is not met.
Spill Containment Bestsellers
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Eagle Manufacturing 4 Drum Plastic Pallet With Drain Yellow
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Containment Types Compared
Five formats cover almost every drum and tote storage situation. They differ mostly by how many containers they hold, how the liquid is captured, and whether the unit is permanent or portable.
| Format | Best For | Typical Capacity | Notes |
|---|---|---|---|
| Spill pallet | 1 to 4 drums, indoor or covered | 15 to 73 gal sump | Drums sit on a grate above the sump |
| Sump platform | 1 to 2 drums, low-profile access | 15 to 30 gal sump | Lower deck height for easier dispensing |
| Containment basin / tray | Small containers, totes, single drums | Varies by footprint | Open tub with no grate, holds the container directly |
| Containment berm | Vehicles, large equipment, temporary outdoor | Sized by footprint and wall height | Flexible-wall, portable, often for field use |
| IBC containment unit | 275 and 330 gallon totes | Holds full tote volume | Tall sump matched to a single large tote |
Spill pallets
The spill pallet is the default for drum storage. Drums sit on a removable grate, and any leak drips into the sump below. Pallets come in 1, 2, and 4 drum footprints, which makes them easy to scale as a storage area grows. They are the most common SPCC containment point for staged drums.
- Holds 1 to 4 drums on a grated deck above the sump
- Forklift-accessible models available for moving full pallets
- Removable grate for cleaning the sump after a leak
- Choose with-drain or no-drain based on how you empty captured liquid
Sump platforms
A sump platform is a lower-profile alternative for one or two drums. The deck sits closer to the floor, which makes it easier to set drums on horizontal dispensing cradles or to roll a drum on and off. The integrated sump still captures leaks, but capacity is smaller than a full four-drum pallet.
- Lower deck height for easier dispensing and drum handling
- Common in 1 drum (15 gallon sump) and 2 drum (30 gallon sump) sizes
- Good fit for an active dispensing station rather than long-term staging
Containment basins and trays
A basin or tray is an open tub with no grate. The container sits directly in it, and the basin holds whatever leaks. Basins suit small containers, pails, and single drums where a grated deck is not needed. They are simple and low cost but are not built for forklift handling or heavy multi-drum loads.
Containment berms
Berms are flexible-wall containment designed to be portable. They are used for vehicle and equipment containment, temporary outdoor staging, and field operations where a rigid pallet does not fit. Walls fold down for drive-in access or stand up to hold liquid. Berms are sized by footprint and wall height rather than a fixed sump volume.
IBC containment units
Intermediate bulk containers, the 275 and 330 gallon totes, need their own containment because one tote holds far more than a drum. An IBC containment unit has a tall sump sized to capture the full volume of the tote it supports, plus a deck or grate that lets you dispense from the bottom valve. If you store totes, a drum pallet will not provide enough sump capacity.
- Sized to hold the full contents of a 275 or 330 gallon tote
- Bottom-valve clearance for dispensing into smaller containers
- Do not substitute a drum pallet for tote containment, the sump is too small
Sump Capacity Sizing
Sizing is where most buyers go wrong. The sump under your containment has to hold enough liquid to satisfy the rule that applies to your facility, not just look like it could. The two numbers that matter are the largest-container rule and the aggregate, or so-called 110 percent, rule.
The largest-container rule (SPCC baseline)
Under SPCC, containment for a storage area generally must hold the volume of the largest single container in that area, plus freeboard for precipitation where the area is open to weather. For a group of 55-gallon drums, that means the sump has to hold at least 55 gallons before you even add the rain allowance. This is the federal floor for oil storage and the number an inspector will check first.
The 110 percent rule
Many state programs, fire codes, and facility specifications go further and require containment equal to 110 percent of the largest container, or in some cases a percentage of the total volume stored. The extra 10 percent provides a safety margin and freeboard. For a single 55-gallon drum that is about 60 gallons of sump. For a 275-gallon IBC tote that is about 303 gallons. Always confirm which percentage your jurisdiction enforces before you buy, because the binding number can come from a state rule rather than the federal baseline.
Quick sizing reference
| Largest Container | SPCC Baseline (100%) | 110% Target |
|---|---|---|
| 5 gal pail | 5 gal | ~5.5 gal |
| 30 gal drum | 30 gal | ~33 gal |
| 55 gal drum | 55 gal | ~61 gal |
| 275 gal IBC tote | 275 gal | ~303 gal |
| 330 gal IBC tote | 330 gal | ~363 gal |
Add freeboard for precipitation when containment is exposed to weather. Outdoor units need extra sump volume so rain does not consume the capacity reserved for a spill. The figures above are planning estimates, not a substitute for your facility SPCC plan or local code.
Poly vs Steel
Containment is built in either polyethylene or steel. The right choice comes down to what you store and where the unit lives. For most drum and tote storage of corrosive or aggressive chemistry, poly is the safer default.
| Factor | Polyethylene | Steel |
|---|---|---|
| Corrosion resistance | Excellent, resists acids and most chemicals | Can corrode unless coated or galvanized |
| Weight | Light, easy to reposition | Heavy, more stable for large loads |
| Flammable liquids | Check ratings, verify against NFPA 30 and local code | Often specified for flammables and high heat |
| Load capacity | High for drum and tote loads | Highest, suits very heavy or industrial loads |
| Best for | Corrosives, general chemical storage, indoor staging | Flammables, high-temperature areas, heavy industrial |
Poly handles acids, caustics, and most corrosive chemistry without degrading, which is why it dominates drum and tote containment. Steel earns its place where you store flammables, where heat is a factor, or where a very heavy industrial load needs the rigidity. When in doubt, match the containment material to the chemical compatibility on your product safety data sheet and confirm flammable storage against NFPA 30 and your local fire code.
Selection by Scenario
By container and count
- Single drum at a bench or dispensing point: 1 drum sump platform or basin
- Two drums staged together: 2 drum sump platform or 2 drum pallet
- Three or four drums in a storage row: 4 drum spill pallet
- 275 or 330 gallon tote: IBC containment unit sized to the tote, never a drum pallet
- Pails and small containers: containment basin or tray
Indoor vs outdoor
Location changes how much sump you need and how the unit captures liquid.
- Indoor, covered: size to the largest-container rule, no rain freeboard needed
- Outdoor, exposed: add freeboard so precipitation does not consume spill capacity
- Temporary or field staging: a portable containment berm folds for drive-in access
- Wash-down or process areas: confirm drainage and discharge handling separately
With-drain vs no-drain
A drain plug makes it easy to empty captured rainwater or rinse a sump, but it adds a point that must be kept closed and managed. A no-drain unit removes that failure mode at the cost of having to pump or vacuum out the sump.
- With-drain: convenient for clearing accumulated rainwater on outdoor units, but the plug must stay closed and any discharge has to be handled per your permit
- No-drain: one fewer leak path, preferred where any discharge would be a violation; empty the sump by pump or vacuum
Frequently Asked Questions
How much sump capacity does a spill containment pallet need?
Under the EPA SPCC rule, containment generally must hold the volume of the largest single container in the area, plus freeboard for rain where the area is exposed to weather. For 55-gallon drums that is at least 55 gallons of sump. Many state programs and fire codes require 110 percent of the largest container, which is about 61 gallons for a 55-gallon drum. Confirm which figure your jurisdiction enforces.
What is the 110 percent secondary containment rule?
It is a common requirement that containment hold 110 percent of the largest container it supports. The base volume covers a full container failure and the extra 10 percent provides a safety margin and freeboard. It often comes from state environmental programs, fire codes, or facility specifications rather than the federal SPCC baseline, which sets 100 percent of the largest container as the floor.
Does a four-drum pallet need to hold four drums of liquid?
No. The capacity rule is keyed to the largest single container, not the total number of drums. A four-drum pallet with a 66-gallon sump satisfies the largest-container rule for 55-gallon drums. The exception is where a state or local rule requires a percentage of the aggregate volume, in which case you size to that higher number.
What containment do I need for a 275 or 330 gallon IBC tote?
A dedicated IBC containment unit with a sump sized to the full tote volume. A 275-gallon tote needs at least 275 gallons of sump under the SPCC baseline, or about 303 gallons where a 110 percent rule applies. A standard drum pallet does not have enough sump capacity to contain a tote failure.
Should I choose poly or steel containment?
Polyethylene is the default for drum and tote storage because it resists acids, caustics, and most corrosive chemistry and is light enough to reposition. Steel is specified where you store flammable liquids, where heat is a factor, or where a very heavy industrial load needs the rigidity. Match the material to the chemical compatibility on your safety data sheet and confirm flammable storage against NFPA 30.
Do I need containment with a drain?
A drain plug makes it easy to clear accumulated rainwater from an outdoor unit, but the plug must stay closed and any discharge has to be handled per your permit. A no-drain unit removes that failure path and is preferred where any discharge would be a violation; you empty it by pump or vacuum instead. Indoor units rarely need a drain.
Is secondary containment the same as a spill kit?
No. Secondary containment is prevention hardware that catches a leak before it spreads, such as a sump pallet or basin under your drums. A spill kit is the response side, the absorbents, socks, and disposal bags you use to clean up a release. Most regulated sites need both. See our hazmat spill kit selection guide for the response side.
Spill Containment Products
Storing intermediate bulk containers? See the full spill containment collection for IBC containment units sized to 275 and 330 gallon totes, plus drum funnels and accessories. These units are built by Eagle Manufacturing, a US producer of poly safety storage equipment.
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