Can you recycle broken glass?
It depends
It depends on what broke. Broken bottles and jars are usually fine in the cart wherever glass is collected curbside, because crushed container glass is exactly what a glass plant buys. Broken drinking glasses, Pyrex, mirrors and window glass are trash. Contain the pieces either way.
Follow it down the line
Three different questions hide inside "is this recyclable?", and the answer can change at each step.
The material · Yes
Is the material recyclable?
Breaking a bottle does not change what it is made of. The industry word for recycled glass is cullet, and cullet is simply crushed, sorted and processed waste glass: crushing is a step in the process, not damage to the material. A glass plant combines cullet with sand, soda ash and limestone to make new containers, so the shards from a dropped jar are a raw material input rather than a ruined one. This is the layer where the intuition misleads people most. Broken feels like spoiled, and for the material it is neither.
Sources: Glass Manufacturing Industry Council: cullet quality, the hidden key to efficient glass production, Glass Packaging Institute: what is glass
The facility · Sometimes
Will a sorting facility recover it?
The scrap industry's trading spec for MRF glass opens by defining the commodity as crushed or whole container glass, which settles the question of whether facilities expect breakage: they do. What the same spec adds is a floor. Below roughly an eighth of an inch, glass becomes what the trade calls fines, particles too small for optical sorting, and a load can carry no more than 30% of them before it is out of spec. Ceramics are capped at 2%, and tempered window glass is a prohibitive at zero. So the honest answer at this layer is that broken container glass is fine until it is too broken, and nobody can tell you where your bottle lands on that scale. What happens after the MRF is the sobering part. In a survey of 46 Northeast facilities, 54% of the region's glass went on to secondary processors for cleaning, while 23.5% became landfill cover, 14.7% went straight to landfill and 7.8% became aggregate. Only two respondents used optical sorters at all. That survey was taken in 2017 and is regional, not national, and it remains the clearest picture available of where MRF glass actually goes.
Sources: ISRI: MRF-derived 3-color mixed container glass specification, Waste Dive: NERC finds 38% of Northeast MRF glass going to landfills
Your curbside program · Varies
Will your curbside program take it?
Programs that collect glass at the curb generally do take broken bottles and jars, and say so without hedging. San Jose's instruction is to recycle only broken bottles and jars, with everything else that broke going to the garbage cart. Napa puts it in one line: broken glass bottles and jars can go in the recycling cart, while broken crystal, tempered and borosilicate glass, windows and other non-bottle glass go in the landfill cart. The split is not really about breakage at all. It is the same container-glass boundary that applies to intact items, applied to pieces. Where the answer flips is in programs that have taken glass out of the cart entirely. Fairfax County collects glass only in its purple drop-off bins, and its reasoning is precisely about breakage: glass mixed with other recyclables at the curb often breaks in transit, and the small pieces ruin the other materials. For genuinely shattered glass it gives the instruction worth copying anywhere: pack it into a rigid container, label the package GLASS, and set it out with the trash.
Sources: San Jose Recycles: broken glass, Napa Recycling: glass, broken, Fairfax County: recycle glass at the purple bin
What you need to do
- Only broken bottles and jars go in the cart, and only where your program collects glass curbside at all
- Contain the pieces before they go anywhere: wrapped in paper, double-bagged, or in a rigid box
- Label the package if it is headed for the trash, so whoever lifts it knows
- Do not break glass on purpose to save space. Whole containers are easier to recover and safer to handle
Where else it can go
Glass-only drop-off
Where a program has pulled glass from the cart, the drop-off bin is the route, and it is the better one for the material: glass collected on its own is far cleaner than glass that rode to the facility with paper.
Bottles and jars only, same as the cart. A drop-off bin is not a home for the broken casserole dish.
The trash, contained and labeled
For anything that is not a bottle or jar, this is the answer, and the packaging is the whole point. A rigid box or doubled bag, marked so the person lifting it knows.
Household hazardous waste
Broken light bulbs are their own category rather than broken glass. San Jose directs them to the HHW drop-off in a puncture-proof container.
This is about what is inside the bulb, not the glass. Do not use it as a route for ordinary breakage.
Common mistakes
- Assuming broken means ruined. A broken bottle is the same soda-lime glass, and the industry's own spec defines its glass commodity as crushed or whole
- Treating all broken glass as one category, when the dividing line is the same container-glass boundary that applies to intact items
- Adding a broken drinking glass or Pyrex dish alongside broken bottles because both are broken glass
- Assuming broken bottles are welcome everywhere, in a program that has moved glass out of the cart entirely
- Sweeping loose shards into a cart or bag, which is why every program that addresses this tells you to contain them first