Liquid industrial by-products generally include liquids and sludges that are not subject to handling and reporting requirements under other regulations (e.g. liquids and sludges not subject to the hazardous waste or medical waste regulations or a wastewater permit, etc.). Common examples of liquid industrial by-products include used oil; antifreeze; discarded vegetable animal fats, oil and grease; grease trap clean-out waste; industrial and commercial wastewaters like wastewaters or on-site septic system sludges from food processing, slaughter houses or laundromats; storm sewer and car wash catch basin wastewaters and sludges; some precipitation removed from secondary containment structures; some sanitary sewer clean-out wastewaters or sludges; some off-specification commercial chemical products; and liquids exempted from hazardous waste regulation like hazardous secondary materials, brine, and very small quantity generator hazardous waste liquids. Liquid industrial by-products regulations apply to most discarded liquids pumped and hauled over public roadway for recycling treatment or disposal. Liquid industrial by-product generators have similar handling requirements to hazardous waste generators. See our Liquid Industrial Generator Guidance, Liquid Industrial By-Products FAQs, and Transporter Websites to learn more.