All secondary chemical containers of hazardous materials, including wash bottles, stock solutions, and carboys must now have Globally Harmonized System (GHS) labels attached in order to be considered in compliance with OSHA regulations.
You can determine if you have a hazardous material by referencing section 2.2 of the chemical's Safety Data Sheet. GHS labels can provided upon request. An example of a GHS compliant label is shown below:
The Occupational Safety and Health Administration (OSHA) has revised their Hazard Communications Standard in 29 CFR to include the adoption of the United Nations Globally Harmonized System (GHS) classification and labeling of chemicals. The purpose of these newer regulations is to provide lab workers with better information on the safe handling and use of hazardous chemicals, thereby allowing them to avoid injuries and illnesses related to exposures to hazardous chemicals.
All newly purchased reagent bottles will have compliant labels already attached. In most cases, you do not have to dispose of older reagent bottles.