The compliance trap of “empty” containers
At first glance, an empty container seems like a non-issue – no product, no problem. But in the eyes of regulators, “empty” is a carefully defined status that can determine whether a container is harmless or still subject to hazardous waste rules, labeling, and fire or environmental risk controls. The EPA and OSHA have detailed definitions of what “empty” truly means. Misunderstanding these rules can lead to serious incidents, hefty fines, and unintentional non-compliance.
The EPA definition: “RCRA empty” explained
Under the Resource Conservation and Recovery Act (RCRA), a container that once held hazardous waste is only legally “empty” if it meets particular criteria outlined in 40 CFR 261.7. The first standard that must be satisfied is that all material has been removed from the container using normal means such as pouring, pumping, or aspirating. Secondly, no more than 2.5 centimeters or 1 inch of residue remains on the container's bottom or inner lining. Additionally, if the container holds less than 110 gallons, it is “empty” if no more than 3% of the total weight or volume exists. Of course, sometimes special circumstances require further evaluation. For example, a gas cylinder is not “empty” until the pressure has reduced to atmospheric levels, and acute hazardous waste containers must be triple rinsed with an appropriate solvent or cleaned by another approved method. If these conditions are not met, the container is still legally considered to contain hazardous waste, even if it feels empty.
The OSHA definition: “Empty” under the Hazard Communication Standard
While the EPA focuses on environmental disposal and waste management, OSHA’s concern with empty containers centers on worker safety—particularly the potential for exposure to hazardous residues or vapors. Under OSHA’s Hazard Communication Standard (29 CFR 1910.1200), a container that previously contained hazardous chemicals must retain its original hazard label until it is adequately cleaned or until the employer removes the label following proper decontamination procedures. For example, a drum labeled “Flammable” must keep this label even if it appears empty, as residual material or vapors may still pose a significant ignition or fire risk. Removing such labels prematurely could lead to workplace hazards and violations of OSHA regulations.
How to stay compliant
Employers must first clearly determine which rules apply to them: whether the container held hazardous materials governed by EPA regulations, hazardous chemicals subject to OSHA requirements, or both. Emptying procedures should be followed, including properly draining the container, performing triple-rinsing when required, and thoroughly documenting all decontamination activities. Original hazard labels must be maintained on containers until they are thoroughly cleaned or reconditioned, as removing labels prematurely violates OSHA’s Hazard Communication Standard. Additionally, employers should provide employees with training on the proper handling, labeling, and disposal of containers and ensure they fully understand what constitutes an ‘empty’ container under federal standards. Finally, a detailed record of all rinsing, draining, and cleaning processes should be maintained to demonstrate compliance during EPA or state inspections.
Keys to remember: Employers should educate their teams, enforce proper cleaning procedures, and maintain compliance records to ensure they are staying compliant with “empty” container standards.