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Hazardous wastes are any chemical wastes which are toxic, corrosive, reactive, or ignitable, as defined by State law in California Code of Regulations (22 CCR), Title 22, Division 4.5, Chapter 11 Section 66261.3 (Listed wastes are found in 22 CCR Sections 66261.30 through 66261.35).

Hazardous Waste includes waste oil, waste coolant, waste parts cleaner, waste photo developer, waste printing inks, waste dry cleaning solvent, waste paint and spray booth filters.

Generators are required to submit a Hazardous Waste Generator Form to their CUPA.

Per 22 CCR Sections 66261.21 – 66261.24, the characteristics of hazardous waste include:

• Ignitability: Wastes with a flash point below 140 F or 60 C. Examples of ignitable wastes include waste solvent-based paint, waste petroleum-based solvents, and waste printing solvents.

• Corrosivity: Acidic and basic wastes with pH less than or equal to 2 or greater than or equal to 12.5. Examples of corrosive wastes include waste caustic cleaners such as sodium hydroxide and waste acids such as hydrochloric acid, phosphoric acid, and sulfuric acids.

• Reactivity: Wastes which are explosive, react violently with water, generate toxic gases when mixed with water, or contain sulfide and cyanides that can generate toxic gases when exposed to pH conditions between 2 and 12.5. Examples of reactive wastes include cyanide wastes from plating and jewelry manufacturing.

• Toxicity: Wastes which pose a hazard to human health or the environment due to carcinogenicity, acute toxicity, chronic toxicity, bioaccumulative properties or persistence in the environment. Examples of toxic wastes include used oil, used coolant, waste dry cleaning solvent, toxic metal dusts and sludge from machine shops, etc.

For information about Hazardous Waste compliance, click on the following:

The Inspection and Enforcement Process

Hazardous Waste Management

Tiered Permitting