In this guide 4 min read
This guide is for businesses that drain coolant, such as auto shops, fleets, dealerships and plants. It covers what is in spent antifreeze, when it counts as hazardous waste, why it stays out of drains and the used oil tank, how to store it and how it is recycled.
Key takeaways
- Spent antifreeze is not used oil. Give it its own container and keep it out of the used oil tank.
- It is a hazardous waste when a test shows lead, cadmium or chromium at or above the federal limit. Some states are stricter.
- Never pour antifreeze down a drain, into a septic system or on the ground.
- Store it closed, labeled "Spent Antifreeze," on a sealed surface away from drains.
- Recycling recovers the usable part of the coolant so it can be used again.
What is in spent antifreeze
Antifreeze, also called coolant, is made with ethylene glycolThe common base of antifreeze. It tastes sweet and is toxic if swallowed (ATSDR). or propylene glycolA safer antifreeze base that is not considered toxic, but it can pick up metals in use (Massachusetts DEP)..
- Ethylene glycol is the common base. It has a sweet taste, and swallowing larger amounts can cause serious illness or death, according to the federal Agency for Toxic Substances and Disease Registry (ATSDR).
- Propylene glycol is the safer alternative. Massachusetts DEP notes it is not considered toxic, but it can pick up metals such as cadmium and chromium while it runs through an engine.
Either kind can pick up metals, oil and other contaminants in a cooling system. That is why spent antifreeze needs careful handling even when the new product is the safer kind.
Spent antifreeze is not used oil. EPA's definition of used oil leaves out antifreeze, so the used oil rules in 40 CFR Part 279 do not cover it.
When spent antifreeze is a hazardous waste
Every business that makes a waste has to find out whether it is hazardous (40 CFR 262.11). You can use what you know about the waste, have it tested, or both.
Spent antifreeze is a hazardous waste if a lab test called the TCLPToxicity Characteristic Leaching Procedure, the lab test that shows whether a waste is hazardous for a toxic substance such as lead (40 CFR 261.24). shows any of these metals at or above its federal limit (40 CFR 261.24):
- Lead: 5.0 mg/L (waste code D008)
- Cadmium: 1.0 mg/L (D006)
- Chromium: 5.0 mg/L (D007)
EPA has noted that waste antifreeze may contain lead, cadmium and chromium at levels high enough to make it a regulated hazardous waste.
Lead in a TCLP test of spent antifreeze
States can be stricter. Washington regulates ethylene glycol antifreeze as a dangerous waste unless it is recycled under the state's special rules. Massachusetts presumes spent antifreeze is not hazardous when it is kept separate from other wastes, and leaves the final call to the business that makes it. Check your state's rules, or ask us.
Why antifreeze must stay out of drains and off the ground
Never pour spent antifreeze down a sink, floor drain, storm drain or septic system, or onto the ground. State guidance is clear on this:
- Washington Ecology: never pour antifreeze down sewers, storm drains, septic tanks or dry wells, or on the ground.
- Massachusetts DEP: antifreeze cannot go in solid waste landfills or onto the ground, and it cannot go into a sewer connection without a permit.
Its sweet taste also makes a spill dangerous if it is swallowed by accident (ATSDR). Clean up drips right away with absorbent pads, and keep the used pads in a closed container.
Keep spent antifreeze separate from used oil and other fluids
Spent antifreeze needs its own container. Washington Ecology warns that mixing antifreeze with used oil, fuels, degreasers or radiator flush chemicals can make spent antifreeze impossible to recycle. Keeping it separate also keeps antifreeze out of your used oil tank.
If something else has already been mixed in, tell us before your pickup so we can work out how it has to be handled.
Can it go in the antifreeze container?
Pick an item, then choose where it goes.
Antifreeze container
- Coolant drained from a car radiatorSpent antifreeze gets its own container.
- Coolant drained from a truck's cooling systemCoolant from trucks and equipment goes in the same container.
Keep it out
- Used motor oilUsed oil goes in the used oil tank. Antifreeze is not used oil.
- DegreaserDegreasers can make spent antifreeze impossible to recycle.
- Radiator flush chemicalsFlush chemicals can make spent antifreeze impossible to recycle.
- Gasoline or dieselFuels can make spent antifreeze impossible to recycle.
All sorted.
What goes in the used oil tank: shop sign
A one-page sign for the wall by your tank. Goes in, keep out, and why it matters.
Download the signHow to store spent antifreeze
Keep spent antifreeze:
- In its own container. A drum or tote used only for antifreeze.
- With the lid on. Open it only to add or remove antifreeze.
- Labeled. Washington Ecology suggests "Spent Antifreeze." Massachusetts DEP accepts "Used Antifreeze" or "Waste Antifreeze."
- On a sealed surface or in containment. Use secondary containment or a non-porous concrete floor.
- Away from drains. Keep it clear of floor drains and storm drains.
Massachusetts DEP also says to keep it out of the hazardous waste and waste oil storage area.
Used oil storage checklist
One page to keep by the tank: storage, labels, spills, pickups, plus a monthly check log.
Download the checklistHow spent antifreeze is recycled
Recycling removes contaminants so the usable part of the coolant can go back into use. EPA and Washington Ecology describe three ways a business can recycle it:
- On site. The business buys a recycling unit and runs it in the shop.
- Mobile service. A truck with a recycling unit comes to the shop and recycles the antifreeze there.
- Off site. A collector picks up the spent antifreeze and takes it to a recycler.
UES collects spent antifreeze for off-site recycling. At the recycling facility, contaminants are removed and usable parts of the coolant are recovered. It can then be processed into recycled antifreeze and returned to use. Massachusetts DEP advises that recycled antifreeze meet the ASTM coolant standards D3306 and D6210.
How UES collects spent antifreeze
We collect spent antifreeze from businesses as its own waste stream and provide totes or drums just for it. If we already collect your used oil, antifreeze collection can often be added to the same visit, with the two kept completely separate.
- Tell us about your antifreezeYour location, roughly how much coolant you generate and how you store it.
- We set up your containersTotes or drums just for spent antifreeze, and a pickup schedule for your volume.
- A UES driver collects itAs its own stream, often on the same visit as your used oil.
- Your service is recordedEach pickup is added to your service history in the Customer Portal.
Request spent antifreeze collection
Tell us roughly how much coolant you generate, how you store it and where your business is on our spent antifreeze collection page, or find your state on our locations page. You can also call 800.988.7977. We reply the same business day, and no account is needed to ask.
UES locations serve Georgia, Florida, Tennessee, Texas and 24 more states.
Questions businesses ask
Is spent antifreeze a hazardous waste?
It can be. It is a hazardous waste when a TCLP test shows lead, cadmium, chromium or another listed substance at or above the federal limit (40 CFR 261.24). Some states, such as Washington, regulate it more strictly.
Can antifreeze go in the used oil tank?
No. Antifreeze is not used oil, and mixing it with used oil can keep the antifreeze from being recycled. Give spent antifreeze its own container.
Can I pour antifreeze down the drain?
No. Keep it out of sinks, floor drains, storm drains and septic systems, and off the ground. Massachusetts, for example, allows it into a sewer connection only with a permit.
What does glycol disposal mean for a shop or fleet?
Glycol is the base of antifreeze. For a shop or fleet, glycol disposal usually means spent antifreeze, which can be collected and recycled so the glycol is used again.
Can UES collect antifreeze on the same visit as used oil?
Often, yes. If we already collect your used oil, antifreeze collection can be added to the same visit while the two stay completely separate.
Does UES take antifreeze from homes?
No. We collect spent antifreeze from businesses only. Households can check with their city or county for a drop-off site.
Written by Universal Environmental Services. Checked against 40 CFR Parts 261 and 262 on October 24, 2026.
Sources
- 40 CFR 261.24, Toxicity characteristic, ecfr.gov
- 40 CFR 262.11, Hazardous waste determination and recordkeeping, ecfr.gov
- EPA, Managing Used Oil: Answers to Frequent Questions for Businesses, epa.gov, updated Jun 23, 2026
- EPA Region 9, Antifreeze Recycling, Best Environmental Practices for Auto Repair and Fleet Maintenance, epa.gov
- Washington State Department of Ecology, Antifreeze, ecology.wa.gov
- Massachusetts DEP, Antifreeze Management and Recycling, mass.gov
- ATSDR, ToxFAQs for Ethylene Glycol, cdc.gov
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