The quick answer
- Unused or expired hair dye is household hazardous waste (HHW) in many communities. Leave it in the bottle or tube it came in, cap it, and bring it to an HHW drop-off site or collection event.
- Do not pour leftover dye or developer down the drain, into a storm drain or onto the ground.
- Leftover mixed color cannot be saved. Do not cap it in a bottle. Follow the box instructions and your local program’s rules for getting rid of it.
- Empty bottles and tubes usually go in the trash, or in recycling if your program accepts that type of container once it is empty and clean.
- Gloves, foils, cotton and towels with dye on them go in the regular trash.
- Salons generally need a business hazardous waste option rather than the free household program.
Why leftover hair dye is treated as hazardous
Permanent hair color is a two-part chemical system. The color tube or bottle holds dye compounds and an alkaline agent, and the developer is a hydrogen peroxide solution. Napa Recycling’s guide points out that most hair dye contains phenylenediamine (PPD), a dye chemical that should not go down the drain. Bleach powders and lighteners add strong oxidizers to the mix.
Wastewater treatment plants and home septic systems are built to break down ordinary household waste, not to strip out concentrated dyes and oxidizers. That is why local programs ask you to keep the unused product out of the sewer. Using hair dye as directed and rinsing it out in the shower is part of normal use; the concern is the leftover product sitting in the cabinet.
Programs that list hair dye or hair color as a hazardous waste item include King County, Washington; Napa County, California; Addison County, Vermont; Peel Region, Ontario; and Orange County, California, where the Costa Mesa Sanitary District’s door-to-door HHW pickup lists hair color among personal care items. In Addison County, a district ordinance requires hair dyes to be kept out of the trash entirely.
Unused or expired boxes
A sealed kit you never used, or a half-used bottle of color that has been sitting under the sink for a year, is the easiest case:
- Keep it in the original container with the label, so the HHW staff know what it is.
- Close the caps tightly and keep the color and developer in separate containers. Never combine them for the trip.
- Pack it upright in a box or bin so nothing tips or leaks in the car.
- Take it to your HHW facility or next collection event. Many accept household loads for free. Some have trip limits; King County, for example, caps each trip at 50 gallons total, in containers of 5 gallons or less.
If a kit is unopened and still in date, a friend or family member who uses the same shade may be glad to have it. Some HHW sites also run swap shelves for usable products, so it is worth asking when you drop it off.
Leftover mixed dye
Once color and developer are mixed, the chemical reaction has started and the product cannot be kept for later. Box dye instructions generally tell you to discard any leftover mixture right away and not to store it in a capped bottle, because the mix keeps reacting and can build up pressure.
How to handle that leftover depends on where you live, because local programs word their hair dye rules differently. Look up “hair dye” or “hair color” in your county or city’s waste sorting guide, and if it does not cover mixed product, call the HHW hotline and ask. Either way, do not rinse a big batch of leftover mix down the sink just to get rid of it.
The best fix is prevention: mix only what you need, use a measuring bowl for touch-ups, and keep the rest of the color and developer separate and capped so the unused part stays usable.
Developer and bleach powder
- Developer is hydrogen peroxide, in strengths sold as volume numbers such as 10, 20, 30 and 40 volume. Higher volumes are stronger. Treat unused bottles like other peroxide solutions; our guide on how to dispose of hydrogen peroxide explains why stronger concentrations belong at hazardous waste.
- Bleach powder and lighteners are oxidizers. Keep them dry, sealed and away from flammable items, and take unused containers to HHW.
- Toners and glosses often come with their own developer. Handle them the same way.
- Do not mix leftover developer with household chlorine bleach or other cleaners. Chlorine bleach is a different product with its own rules; see how to dispose of bleach.
Empty bottles, tubes and gloves
Once a container is truly empty, it is usually no longer HHW:
- Plastic applicator and developer bottles: rinse them if your program asks for clean containers. Whether they are recyclable depends on the plastic and your local rules; many programs only want bottles, jugs and tubs in a few specific resin types.
- Color tubes: squeezable metal or laminated tubes are hard to empty completely and are usually trash.
- The box and paper instructions: recycle with paper and cardboard.
- Gloves, foils, caps, cotton and stained towels: regular trash. Dye-stained old towels can be reused as rags for future coloring.
Salons and businesses
Household HHW programs are usually limited to residents. Salons, barbershops and beauty schools generate dye waste every day, and most programs send them to a separate business option. Napa’s facility, for example, takes household waste without an appointment or fee but requires businesses to book an appointment and pay. Peel Region has a registration process for businesses. Some regions run small business hazardous waste programs with lower costs for very small quantity generators. Check with your county or state environmental agency about what applies to your shop.
Where to take it
Most counties either run a permanent HHW facility, hold collection days a few times a year, or partner with a nearby county. Some cities offer curbside or door-to-door HHW pickup. Our guide to where to dump household hazardous waste explains the options, and you can search dumps, transfer stations and drop-off sites near you. Call ahead to confirm hours, residency rules and any fees.
Cleaning out a bathroom cabinet? The same trip can take care of other beauty and personal care products. See our guides to nail polish and remover and hand sanitizer.
What not to do
- Do not pour unused dye or developer down any drain, toilet or storm drain, and do not dump it on the ground.
- Do not store mixed color in a closed bottle.
- Do not combine leftovers from different products into one container.
- Do not burn it or throw it in a fire pit.
- Do not leave it at a donation bin. Thrift stores usually do not take opened chemical products.
Hair dye disposal FAQ
Can I pour hair dye down the drain?
Not leftover or unused dye. Local programs such as Napa Recycling in California say hair dye should not be poured down the drain because of the chemicals it contains. Take unused color and developer to household hazardous waste instead.
Is hair dye hazardous waste?
Many communities treat it as household hazardous waste, including King County in Washington, Addison County in Vermont and Peel Region in Ontario. Look up hair dye or hair color in your local waste guide to confirm the rule where you live.
What do I do with leftover mixed hair dye?
Do not save it or cap it in a bottle, because the mixture keeps reacting. Follow the box directions, and check your local program for how it wants leftover mixed product handled. Mix only what you need next time.
How do I dispose of hair developer?
Developer is a hydrogen peroxide solution. Keep unused bottles closed and separate from the color and take them to household hazardous waste, especially stronger 30 and 40 volume developers.
Can I recycle empty hair dye bottles?
Sometimes. Once a plastic bottle is completely empty, your curbside program may accept it if it takes that type of plastic. Squeeze tubes, gloves and foils usually go in the trash, and the cardboard box can be recycled.
How do salons dispose of hair dye?
Salons generally cannot use the free household program. Most areas direct businesses to a business hazardous waste option, such as an appointment-based drop-off with fees or a licensed hazardous waste hauler.
The bottom line
To dispose of hair dye, take unused or expired color, developer and lightener to a household hazardous waste site in their original closed containers, and keep them out of the drain. Never store mixed color; follow the box directions and your local rules for leftovers. Empty bottles and tubes, gloves and the box go in the trash or recycling as your program allows, and salons should use a business hazardous waste service.