Contact lens cases are made from polypropylene, a number 5 plastic that is technically recyclable. However, most curbside recycling programs won’t accept them because they’re too small to be sorted properly at standard facilities. Your best option is a free mail-in or drop-off recycling program designed specifically for contact lens products.
Why Curbside Recycling Won’t Work
Municipal recycling facilities use automated sorting equipment that screens items by size. Small plastics like contact lens cases, lids, and utensils fall through the sorting screens and end up in the landfill stream regardless of what bin you put them in. Many cities, including Berkeley, California, explicitly instruct residents to put small plastics in the trash rather than the recycling bin. Tossing a contact lens case into your curbside recycling can actually cause problems by jamming machinery or contaminating other recyclable materials.
Free Recycling Programs That Accept Cases
The most accessible option is the Bausch + Lomb ONE by ONE Recycling Program, run in partnership with TerraCycle. It accepts used contact lenses, lens cases, contact lens packaging, and small solution bottles (4 ounces or smaller). The program is free, and you drop off your items at participating eye care offices around the country. You can search for a location near you on the TerraCycle website. Items should be empty and dry before drop-off, but you don’t need to scrub them clean.
Another option is the Preserve Gimme 5 Program, which accepts hard number 5 plastics including contact lens containers. These programs process the polypropylene into new products rather than sending it to a landfill.
If neither program is available in your area, the straightforward recommendation is to throw the case in the trash. That’s not ideal, but it’s better than putting it in your curbside bin where it will cause sorting problems and end up in the landfill anyway.
How Often Cases Need Replacing
The CDC recommends replacing your contact lens case at least every three months. Between replacements, you should clean the case by rubbing and rinsing it with contact lens solution (not water), then store it upside down with the caps off to air dry. This routine prevents bacterial buildup that can lead to serious eye infections. At four cases per year, even a single contact lens wearer generates a steady stream of small plastic waste, which is exactly why specialty recycling programs exist for these products.
What Happens When Cases End Up in Waterways
Contact lens waste that gets flushed or washed down drains creates a real environmental problem. Roughly 300,600 grams of contact lens waste enters U.S. sewage systems every day, based on estimates from the 45 million Americans who wear contacts. While that figure includes lenses themselves, cases and packaging add to the total plastic load. Research published in the journal Molecules found that a single gram of contact lens waste can release between 5,600 and 17,700 microplastic particles. Across the country, that adds up to an estimated 10 metric tonnes of microplastics flowing into wastewater treatment plants and aquatic environments.
These microplastics are too small for most treatment plants to fully capture, so they pass through into rivers, lakes, and oceans. Keeping contact lens cases out of the trash when possible, and never flushing any contact lens products, reduces this contribution.