The hazard communication standard (HCS), or worker “right-to-know” law, regulates how information about workplace chemical hazards is communicated to employees. As with most workplace health and safety standards, worker right-to-know laws have developed in large part according to standards adopted under the Occupational Safety and Health Act (OSH Act), a federal law. Individual states may devise and administer their own work safety laws and regulations, but only if the state program has federal approval. To qualify for approval, a state plan must be at least as stringent as the federal law. Iowa has such a plan in effect, and it has been approved by federal authorities.
The federal law is basically a disclosure rule that requires private employers with hazardous substances in their workplaces to develop comprehensive hazard communication programs, and to inform and train their employees about chemical hazards in the workplace. There is a detailed discussion of the federal regulations.