One of the most complex tasks Airsafe is asked to do is waste classification. It’s a structured process, set out in the EPA’s Waste Classification Guidelines, and it can involve digging into the history of the site and the material itself, plus laboratory testing for a range of contaminants. The aim is to place the waste into one of six classes, because the class decides what you can legally do with it, and where it has to go.
The six waste classes
- Special waste, includes asbestos, clinical and related waste, and tyres, each with its own disposal requirements.
- Liquid waste, waste that is, or behaves as, a liquid.
- Hazardous waste, includes explosives, gases, flammable solids, and material contaminated with lead, coal tar and other hazardous substances.
- Restricted solid waste, more contaminated than general solid waste, but below hazardous waste.
- General solid waste (putrescible), waste that breaks down, smells or attracts vermin, such as food waste and manure.
- General solid waste (non-putrescible), stable solid waste that doesn’t readily decay.
Getting the class right matters in both directions: misclassify low and you risk illegal disposal and penalties; misclassify high and you pay landfill prices for material you could have reused.
VENM and ENM, reusing clean and near-clean soil
Two classifications exist specifically so good soil isn’t wasted:
- Virgin Excavated Natural Material (VENM) is a special type of general solid waste (non-putrescible): natural material that has never been farmed, built on or otherwise modified, and is uncontaminated with hazardous materials. The advantage of having soil classified as VENM is that you can sell it to be reused at another site, what used to be called “clean fill”. If you’re planning to sell VENM, you need the paperwork to prove it’s VENM, which means getting experts in to assess and, where needed, test it.
- Excavated Natural Material (ENM) covers natural soil and rock that has been disturbed or carries low-level contamination but still meets the chemical and physical criteria in the Excavated Natural Material Order. Once assessed, tested and certified against the Order, ENM can also be reused off site. ENM and VENM both exclude material that contains asbestos, acid sulfate or potential acid sulfate soils, or sulfidic ores.
If any asbestos is found in the material, bonded or friable, it has to be classified as Special Waste (Asbestos Waste) and can’t be VENM or ENM. We identify asbestos in our own NATA-accredited laboratory; see our Asbestos in Soil page.
How we classify your waste
- We review the site’s history and the material, and design a sampling program for it.
- We recover samples and have the chemistry analysed at an external NATA-accredited laboratory, and identify any asbestos in our own NATA lab. Where PFAS is a possibility, we assess for it in line with the PFAS requirements in the Waste Classification Guidelines.
- We produce a waste classification report, or a VENM or ENM assessment, that complies with EPA and council requirements, so you can move the material with confidence.
For the wider site picture, see our Contaminated Land Assessments page.
We classify. A licensed contractor disposes.
Airsafe is an independent consultant. We classify the material and tell you where it can legally go, we don’t haul it, treat it or run the landfill. The disposal or reuse is carried out by others, to the classification we’ve provided. Because we don’t profit from where the waste ends up, our classification is just the honest answer, which is what keeps you compliant.
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Frequently asked questions
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Both let you reuse soil off site rather than send it to landfill. VENM is clean, natural, never-disturbed material with no contamination, the simplest case. ENM covers natural soil and rock that’s been disturbed or carries low-level contamination but still meets the criteria in the Excavated Natural Material Order once it’s been tested and certified. Material with asbestos, acid sulfate soils or sulfidic ores can’t be either. We work out which, if any, your material qualifies as.
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Because it decides what’s legal and what it costs. Classify too low and you risk illegal disposal and serious penalties; classify too high and you pay landfill rates for material you could have reused as fill. An accurate classification protects you on both fronts, and often saves money by keeping reusable soil out of landfill.
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Yes. Asbestos is identified in our own NATA-accredited laboratory, and any asbestos present means the material must be classified as Special Waste (Asbestos Waste). Where PFAS is a possibility, we assess for it in line with the requirements in the Waste Classification Guidelines. The wider chemistry is analysed at an external NATA-accredited laboratory.
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No. Airsafe classifies the material and tells you where it can legally go. The transport, treatment and disposal or reuse are handled by others, to our classification. Because we don’t profit from where it ends up, the classification stays independent and honest.
Talk to us about classifying your soil or waste
Whether you’re trying to reuse clean fill or work out what a contaminated stockpile actually is, Airsafe will classify it properly so you can move it legally and cost-effectively.
To organise a waste or VENM classification, call us on 1300 888 338.
Last updated: June 2026
