Zero waste is a philosophy and practical goal aimed at eliminating waste sent to landfills, incinerators, and the natural environment. The peer-reviewed international definition describes it as “the conservation of all resources by means of responsible production, consumption, reuse, and recovery of products, packaging, and materials without burning and with no discharges to land, water, or air that threaten the environment or human health.” In practice, most cities and certification programs define success as diverting at least 90% of waste from landfills and incinerators, not necessarily reaching a literal zero.
Why the Goal Is 90%, Not 100%
The term “zero waste” sounds absolute, but the movement acknowledges that completely eliminating all waste isn’t yet realistic in most systems. Instead, cities like Austin, Texas and Oakland, California have set official targets of 90% diversion from landfills and incinerators. The TRUE certification program, used by businesses and facilities worldwide, requires an average of 90% or greater diversion over 12 months to qualify. That remaining 10% accounts for materials that current infrastructure simply can’t process, like certain mixed-material products or contaminated items.
This threshold still represents a dramatic shift from where most places stand today. The average American generates about 2.2 kilograms (roughly 4.8 pounds) of waste per day, more than double the global average of 0.88 kilograms. And much of what gets thrown away could have been diverted. In the United States, only 8.7% of plastics were recycled in 2018. Of the 35.7 million tons of plastic generated that year, 27 million tons went straight to landfills.
The Zero Waste Hierarchy
Zero waste isn’t just about better recycling. It follows a strict priority system, where preventing waste in the first place ranks far above managing it after the fact. The Zero Waste International Alliance outlines these levels from most to least preferred:
- Rethink and redesign: Change systems at the root so wasteful consumption doesn’t happen. This includes redesigning products and packaging for reuse or disassembly.
- Reduce: Use fewer materials and less toxic ones. This applies to both manufacturers and consumers, though the framework acknowledges that people’s basic needs should be met first.
- Reuse: Keep products and components in use for the same or a similar purpose, retaining their original value and function.
- Recycle and compost: Mechanically reprocess materials into new products, or biologically return organic matter to soil.
- Material recovery: Salvage whatever remains after the steps above. This does not include burning materials for energy, which the hierarchy considers unacceptable.
- Residuals management: Handle whatever is truly left in a way that doesn’t harm the environment. Analyze why those items became waste in the first place.
The key insight here is that recycling sits in the middle of the hierarchy, not at the top. Zero waste prioritizes never creating the waste over figuring out what to do with it afterward.
How It Differs From Recycling and the Circular Economy
Recycling is one tool within the zero waste framework, but it’s not the same thing. Zero waste focuses on prevention: stopping waste from being created. Recycling deals with materials after they’ve already been used and discarded. Given that less than 9% of plastics in the U.S. actually get recycled, relying on recycling alone clearly isn’t enough.
The circular economy is a related but distinct concept. Where zero waste focuses on eliminating waste at the source through changes in design and consumption, the circular economy is a broader economic framework that keeps materials in circulation through recycling, refurbishing, and remanufacturing. Think of zero waste as the prevention-first mindset and the circular economy as the system-level design strategy. They overlap significantly, but zero waste puts more emphasis on refusing and reducing, while the circular economy focuses on maintaining the highest value of materials for as long as possible.
Why Landfills Are the Problem
When organic waste like food scraps and yard trimmings break down in a landfill, they produce methane, a greenhouse gas at least 28 times more effective than carbon dioxide at trapping heat in the atmosphere over a 100-year period. Landfills are one of the largest human-caused sources of methane emissions. Diverting organic waste through composting instead produces far less methane because the material breaks down in the presence of oxygen rather than buried without it.
Beyond greenhouse gases, landfills can leach chemicals into groundwater and soil, and they occupy enormous amounts of land. Zero waste aims to shrink the stream of materials flowing into these sites by addressing waste at every earlier stage.
Communities That Have Made It Work
Kamikatsu, a small town in Japan, declared a zero waste goal in 2003 after starting a pilot project in 1998 with 22 waste categories. By 2020, residents were sorting their waste into 45 separate categories and achieving an 81% recycling rate, one of the highest in Japan. The town’s approach relies heavily on source separation, meaning residents sort materials at home rather than sending mixed waste to a processing facility. Better sorting reduced the volume of waste sent to incineration significantly over two decades.
Kamikatsu is small (around 1,500 people), and scaling its model to larger cities presents obvious challenges. But the principles translate. Austin’s zero waste plan targets 90% diversion by 2040 using a combination of expanded composting, construction waste requirements, and single-use plastic reductions. Oakland measures its progress against a 2005 baseline.
What Zero Waste Looks Like at Home
At the household level, zero waste typically starts with a waste audit: examining what you throw away over the course of a week or two and categorizing it. The EPA recommends looking at purchasing and management practices alongside the physical waste itself to figure out where reduction efforts will be most effective. Most people discover that food waste, single-use packaging, and disposable convenience items make up the bulk of their trash.
From there, the hierarchy applies in practical terms. Refusing unnecessary packaging (bringing your own bags and containers), reducing purchases, and choosing reusable versions of disposable products come first. For food waste, home composting is one of the most impactful steps. A functioning compost pile works best when the ratio of carbon to nitrogen in the materials starts around 30 to 1. Carbon-rich “browns” include dry leaves (with ratios between 30 and 80) and paper products. Nitrogen-rich “greens” include fresh grass clippings (ratios of 15 to 25), kitchen scraps, and coffee grounds. Mixing these materials feeds the microbes that break everything down into usable soil.
Zero waste at home doesn’t require perfection. The goal is to systematically reduce what goes in the trash by addressing the biggest sources first and building habits from there. Even cutting household landfill waste in half represents a meaningful change when multiplied across a community.
How Businesses Get Certified
For organizations, the TRUE certification program provides a structured path. To earn certification, a facility must have a formal zero waste policy, achieve 90% or greater diversion from landfill and incineration over 12 months, comply with all relevant waste and environmental regulations, and maintain contamination levels below 10% for any materials leaving the site. Facilities also need to document a base year of waste data and submit updated diversion numbers annually to keep the certification current.
The certification covers seven minimum requirements and a points-based system where facilities need at least 31 points. This structure gives businesses flexibility in how they reach the threshold, whether through redesigning supply chains, composting food waste from cafeterias, or establishing take-back programs for products and packaging.