Waste prevention
Waste prevention comprises measures taken before a substance, material, or product becomes waste to reduce the quantity generated, the harmful effects of the resulting waste on people and the environment, or the content of harmful substances. It includes demand reduction, durable design, maintenance, reuse, and process changes that avoid waste at source.
In simple terms
Within the waste hierarchy, prevention changes the activity that would have produced waste rather than treating material after it is discarded. It can mean eliminating an unnecessary item, using less material, improving repairability, enabling reuse, preventing spoilage, or changing production so fewer offcuts arise. Measurement should identify a baseline and avoid shifting impacts elsewhere. A lighter package, for example, is not automatically better if it causes more product damage or cannot perform safely.
Why it matters
Waste that never arises needs no collection, sorting, treatment, or disposal. Prevention can therefore avoid material extraction and downstream impacts while retaining more value than end-of-life processing. It also reveals whether an organization is reducing waste generation or merely improving how a growing waste stream is handled.
Example
A food service maps why prepared meals are discarded, improves forecasting and portion options, and redistributes safe surplus. It tracks meals avoided rather than counting donated or composted food as prevention. Composting remains useful for unavoidable scraps, but it does not replace the upstream changes that stop edible food becoming waste.
How it differs
Waste hierarchy
Waste prevention is the highest-priority action in the waste hierarchy; the hierarchy itself is the full ranked framework that also covers reuse preparation, recycling, recovery, and disposal.
Reuse
Prevention includes many ways to avoid waste, while reuse specifically involves using a product or component again without it first becoming waste.