Excavation can leave a project with a significant volume of soil that needs to be reused, transported or disposed of. What happens next depends on what the material is, where it came from, and which regulatory framework applies.
This is where VENM, ENM and GSW become important in NSW. South Australia uses a different framework, with terms such as waste fill and intermediate waste soil applying in relevant circumstances.
Understanding the applicable VENM and ENM classification in Australia helps project teams determine whether excavated material can be reused, what investigation or testing may be required, and where it can be managed through a waste classification assessment.
Construction and demolition was Australia's largest waste category in 2024–25 (reported on 22nd September, 2026), with more than 80% of its waste recycled.
Excavated Soil and Its Classification
In NSW, excavated material does not automatically fall into one category because it can look like natural soil. VENM, ENM and general solid waste (GSW) have different meanings and lead to different management pathways.
Virgin Excavated Natural Material (VENM)
Virgin Excavated Natural Material (VENM) is natural material such as clay, gravel, sand, soil or rock fines that meets the definition under the Protection of the Environment Operations Act 1997.
For material to qualify as VENM, it must come from an area that is not contaminated with manufactured chemicals or process residues from industrial, commercial, mining or agricultural activities. It must also be free from sulfidic ores or soils and other waste.
In other words, VENM depends on more than what the soil looks like. Where it came from and what happened on or around the site can affect whether it meets the definition.
For example, soil excavated from a site with a history of industrial activity, uncontrolled filling, landfill use, or other potentially contaminating activities may require closer assessment before it can be treated as VENM.
Where VENM is waste, it is pre-classified as general solid waste (non-putrescible).
Excavated Natural Material (ENM)
Excavated Natural Material (ENM) is another NSW category and should not be treated as simply another name for VENM.
ENM is naturally occurring rock and soil excavated from the ground that contains at least 98% natural material by weight and does not meet the VENM definition. Certain materials, including asbestos-containing material, acid sulfate soils, potential acid sulfate soils and sulfidic ores, are excluded.
The important distinction is that material that does not qualify as VENM is not automatically waste that must go to disposal.
ENM can have a resource recovery pathway for uses such as engineering fill or earthworks when it meets the applicable requirements.
General Solid Waste (GSW)
General Solid Waste (GSW) is a waste classification within the NSW waste classification system. It is not simply another term for excavated natural material.
If excavated material does not fit a specific reuse pathway, it may need to be assessed under the broader waste classification process to determine the appropriate waste class.
In practical terms:
- VENM must meet the statutory definition for virgin excavated natural material.
- ENM is natural excavated material that meets the requirements of the applicable ENM framework but does not meet the VENM definition.
- GSW is a waste classification that may apply when material is assessed under the broader waste classification system.
Getting this distinction right matters because classification affects what can happen to the material next.
VENM vs ENM vs GSW: NSW Classification at a Glance
| Classification | Key point | Possible pathway |
|---|---|---|
| VENM | Natural material that meets the NSW statutory definition | Reuse or other permitted management |
| ENM | Natural material with at least 98% natural material that does not qualify as VENM | May be reused under applicable requirements |
| GSW | A broader NSW waste classification | Appropriate management or disposal pathway |
South Australia's Approach to Excavated Soil
NSW terminology should not simply be carried across to South Australia.
South Australia has its own framework for waste soils. Depending on the circumstances, terms such as waste fill and intermediate waste soil may apply.
If waste soil is intended for reuse elsewhere, it needs to be tested and classified according to the applicable requirements. If it is being sent for disposal, contact the receiving landfill before transport to confirm it can accept the material.
For PFAS-affected waste soils, the SA EPA also uses classifications including waste fill and intermediate waste soil.
The practical takeaway is simple: a classification that applies in NSW should not be assumed to have the same meaning in South Australia.
Factors That Determine Whether Soil Requires Testing
Not every excavation requires the same level of investigation or laboratory analysis.
The appropriate approach depends on the material, its source, site history and what you intend to do with it.
Closer assessment may be warranted where there is:
- A history of industrial, commercial or agricultural activity
- Imported or uncontrolled fill
- Known or suspected contamination
- Historical waste disposal or filling
- Potential asbestos
- Acid sulfate soil or potential acid sulfate soil conditions
- A proposed off-site reuse or disposal pathway with specific requirements
For VENM in NSW, laboratory testing is not automatically required in every case. Testing may be appropriate where information is needed to establish whether contamination, manufactured chemicals, process residues or sulfidic materials are present.
The aim is not to test soil simply because it has been excavated. The investigation should provide enough evidence to establish its classification and the appropriate management pathway.
From Site History to Final Classification
A classification assessment starts with understanding the material before deciding what testing is appropriate.
The process typically considers:
- Site history and land use – Previous activities can indicate potential contamination sources.
- Source and nature of the material – What was excavated, where it came from and how much material is involved.
- Potential contamination indicators – Site observations, previous investigations and the condition of the material can identify issues requiring further assessment.
- Sampling and laboratory analysis, where required – Testing should reflect the material, site conditions and proposed management pathway.
- Assessment of results – Results are compared with the criteria relevant to the classification being considered.
- Final classification and management decision – The classification is then used to determine whether the material can be reused, requires a particular management pathway or needs to go to an appropriate waste facility.
The level of investigation should therefore be proportionate to the site history, material and intended destination, rather than based on a one-size-fits-all testing approach.
What the Classification Means for Reuse and Disposal
Classification provides the basis for deciding what happens to excavated material.
Depending on the material and applicable requirements, it may be:
- Reused on the originating site
- Reused at another site
- Supplied under an applicable resource recovery pathway
- Transported to an authorised waste facility
- Subject to further management where required
For VENM soil disposal under NSW EPA requirements, you also need to check the receiving facility's acceptance criteria before transporting the material.
This is an important practical point. Knowing the classification does not automatically mean a particular facility will accept the soil.
When Contamination Changes the Management Pathway
Contamination can change what happens to excavated material.
If contamination is identified or suspected, the assessment may need to consider:
- What contaminants are present
- Their concentration and distribution
- Whether the material can be reused
- Whether additional controls apply
- What type of receiving facility can accept it
- Whether further environmental investigation is required
This is why you should consider site contamination investigation and site history before excavation and off-site movement, rather than only after disposal arrangements have been made.
When Professional Advice Can Help
Professional advice can be useful where:
- Excavated material will be transported off-site
- The site has a history of industrial or commercial use
- Fill material is present
- Contamination is suspected
- The intended reuse pathway is unclear
- Laboratory testing requirements are uncertain
- The receiving facility has specific acceptance requirements
- The project is in NSW or SA, and the applicable state framework needs to be established
Get the Classification Right Before Soil Leaves the Site
Excavated soil can look like ordinary ground material, but its classification depends on more than what is visible at the excavation face.
In NSW, VENM, ENM and GSW have distinct meanings and pathways. South Australia uses a different framework, including categories such as waste fill and intermediate waste soil.
Understanding the applicable requirements before excavation and off-site movement helps project teams make informed decisions about testing, reuse, transport and disposal.
FAQs
What is VENM in NSW?
Virgin Excavated Natural Material is natural material such as clay, gravel, sand, soil or rock fines that meets the definition under NSW legislation, including requirements relating to contamination, sulfidic materials and other waste.
What is ENM in NSW?
Excavated Natural Material is naturally occurring rock and soil excavated from the ground that contains at least 98% natural material by weight and does not meet the VENM definition, subject to the applicable ENM requirements.
What is the difference between ENM, VENM and GSW?
ENM, VENM and GSW are different classifications used when managing excavated material. VENM refers to virgin excavated natural material that meets the statutory definition. ENM refers to naturally occurring excavated material that does not meet the VENM definition but may qualify for reuse under the applicable requirements. GSW is a waste classification that may apply when material is assessed under the broader waste classification system.
Does excavated soil need to be classified before leaving a construction site?
Excavated soil may need to be classified before it is transported, reused or disposed of, depending on the material, site history, contamination risks and intended management pathway. Classification helps determine whether material can be reused, managed under a resource recovery pathway or requires disposal at an authorised facility.
Can contaminated soil be classified as VENM?
Generally, contaminated soil would not meet the definition of VENM. VENM must satisfy specific requirements relating to contamination, manufactured chemicals, process residues, sulfidic materials and other exclusions. Where contamination is identified or suspected, further assessment may be required to determine the appropriate classification and management pathway.
Does excavated soil always need laboratory testing?
No. The required testing depends on the material, site history, potential contamination, and the classification or reuse pathway. Chemical testing is not mandatory for all VENM.
Can ENM be reused on another site in NSW?
Potentially, but the applicable requirements of the Excavated Natural Material Order and Exemption must be met for the intended reuse.
How is excavated soil classified in South Australia?
South Australia uses its own waste soil framework rather than the NSW VENM/ENM terminology. Depending on the circumstances, terms such as waste fill and intermediate waste soil may apply, and waste soil intended for reuse elsewhere must be tested and classified under the applicable requirements.
What happens if excavated soil is contaminated?
The material may require a different classification, management pathway or receiving facility. Applicable requirements depend on the contaminants, material, and jurisdiction.
