Published August 15, 2025 · 5 min read · Updated September 27, 2026
How California businesses tell whether a waste is hazardous, which everyday streams usually are, and what changes once the answer is yes.
Nobody sets out to generate hazardous waste. It shows up as a box of dead batteries in the maintenance shop, a pallet of fluorescent tubes from a lighting upgrade, a cabinet of half-used cleaning products, or a pile of laptops after a refresh. The moment a business decides to throw any of those away, it has to answer a legal question: is this hazardous waste?
Modern Waste Solutions has operated since 1999 from its Sacramento facility and recycles several of the most common hazardous streams, including electronics, batteries and solar panels, for organizations throughout California. This article explains when business waste becomes hazardous, how the determination works, which streams from ordinary operations usually qualify, and what the rules require afterward.
Two things have to be true. First, the material has to be a waste: something you have decided to discard, not a product you still intend to use. Second, it has to meet the definition of hazardous. Under the federal rules, the U.S. EPA treats a waste as hazardous if it appears on one of its lists or shows one of four characteristics:
California goes further. DTSC regulates "non-RCRA" or California-only hazardous wastes that federal criteria don't catch, and its toxicity tests cover more substances than the federal test does. A waste that would pass federal screening can still be hazardous in California.
The business that generates it. California regulations (title 22, section 66262.11) require generators to make an accurate hazardous waste determination. You can do that by testing the waste or by applying knowledge of the materials and processes that produced it. Product labels and Safety Data Sheets are the usual starting point: a flammable, corrosive or toxic warning on the product generally carries through to the waste.
Write the determination down, especially when you conclude a waste is not hazardous. That record is what you will point to if an inspector disagrees.
Most businesses don't run chemical processes, yet nearly all of them generate some hazardous waste through normal operations. The table covers the usual streams and where each one should go.
| Waste from everyday operations | Why it needs special handling | Where it should go |
|---|---|---|
| Batteries of all chemistries | Metals, acids, fire risk; universal waste | Battery recycler (we handle this) |
| Computers, monitors, phones, printers | Lead and other metals in components; universal waste | Electronics recycler (we handle this) |
| Fluorescent lamps and old ballasts | Mercury in lamps; some older ballasts contain PCBs | Lamp and ballast recycler |
| Solar panels | Universal waste in California | PV recycler (we handle this) |
| Aerosol cans with product left inside | Pressurized, often flammable; universal waste | Universal waste handler that accepts aerosols |
| Paint, solvents, cleaners, used oil, lab chemicals | Ignitable, corrosive or toxic | Licensed hazardous waste transporter |
We don't collect paint, solvents, oil or lab chemicals. Those need a licensed hazardous waste hauler with the right manifests. Keeping them out of your electronics and battery containers avoids problems for both vendors.
California regulators regularly find hazardous waste in business trash. In 2023 the Attorney General announced a $49 million settlement with Kaiser after undercover inspections of dumpsters at 16 facilities found hundreds of items of hazardous and medical waste, including aerosols, cleansers, sanitizers, batteries and electronic waste, along with paper records containing patient information. The settlement required years of independent trash audits. The items at issue were ordinary supplies and equipment that went into the wrong container.
The answer determines how you store it, how long you can keep it and who can take it away. California sorts generators by monthly volume:
DTSC has not adopted the federal exemption for very small quantity generators, so even small California businesses have generator requirements. Universal wastes such as batteries, electronics and lamps are the exception that makes life easier: they can be managed under the simpler universal waste rules with labeled containers, a one-year accumulation limit, training and shipping records.
Electronic devices that exhibit a hazardous characteristic are hazardous waste, and California lets businesses manage them as universal waste. Either way they can't go in the trash.
Yes. California did not adopt the federal very small quantity generator exemption, so small generators still have requirements. Universal waste rules simplify things for batteries, electronics and lamps.
No. Mixing can make a whole load hazardous and create fire or chemical risks. Keep each stream in its own labeled container.
No. We handle electronics, batteries and solar panels. Paint, solvents and chemicals should go to a licensed hazardous waste transporter.
Business waste becomes hazardous when you decide to discard something that is listed or has a hazardous characteristic, and in California that net is wider than the federal one. Make the determination, write it down, and route each stream to the right handler. For the streams we cover, including batteries and electronics, request a quote and we will set up collection with the records you need.
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Simplify your compliance and disposal process with bundled recycling services that handle both electronic devices and batteries in one streamlined solution.
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Statewide Pickup Routes from San Diego to Redding
Our scheduled, route-based pickups cover all major regions of California—ensuring efficient, on-time service no matter where you operate.
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Secure, Labeled Containers Included
We provide clearly labeled, tamper-resistant containers to ensure safe and compliant collection of electronic waste and batteries at your location.
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Trusted by Californians for Over 20 Years
Modern Waste Solutions has served businesses and communities across California with dependable, environmentally responsible recycling solutions for over two decades.
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This was our first time working with MWS and they were amazing! Quick response time, efficient, and friendly. Ivan was the team member who was on site for the pickup, and he was great. He worked quickly, is very knowledgeable, and is so kind. It was so easy working with him. We are looking forward to using MWS for our E-waste and Universal waste needs in the future. - Sacramento City College Sustainability
Sophie Wheeler
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A little bit off the beaten track in Natomas, but Modern Waste quickly and efficiently helped me recycle my broken Lithium Iron Phosphate batteries at a reasonable $/lb fee (Sac county e-waste will not accept these items). Ramiro and Vincent were very friendly and helpful.
We had another vendor cancel on us last minute & Modern Waste jumped into action & was able to help us with ewaste & critical document shredding overnight. Team was helpful, professional & got the job done quickly & efficiently. We were able to complete an office move out/shut down in a day with their help! Highly recommend this business!
Thank You Gretchen! We are happy to make a difference.
Chris was awesome! He came in and picked up all of the e-waste we had ready for him. He was polite and professional throughout the entire process. He handled the equipment with care, including the site equipment that was already in place. I am very happy with his service and appreciate the great job he did.
I needed hard drives on some old laptops destroyed so any old personal information can't be stolen. The guys there were friendly and helpful and fast. Thanks Pavel and Vincent. Thanks Modern Waste for doing a helpful fast service to us.
We truly appreciate your generous review! 😊 It's fantastic to know our team was able to assist you with your hard drive destruction needs efficiently. We are so glad to hear you had a pleasing experience with us. Our door is always open for all your future recycling needs!
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