While there is currently no federal heat standard from OSHA, state OSHA plans can implement their own. These are the states with standards surrounding extreme heat and main points from the statute:
California: California has a Heat Illness Prevention Standard for outdoor places of employment. It applies to industries like agriculture, landscaping, construction, oil and gas extraction, and transportation or delivery of agricultural products. It requires water breaks, access to shade, and training.
Minnesota: This statute applies to indoor workplaces. Specifically, it covers air flow and circulation, heat conditions and specific temperatures employees should not be exposed to indoors, cold conditions, and circulated air.
Oregon: Oregon recently implemented two new rules relating to heat illness for workers. The rule 437-002-0156 which applies to all workplaces, and rule 437-004-1131 applies to agricultural workplaces. These rules’ requirements include access to shade, drinking water, supervisor and employee training, acclimatization practices, and high heat practices.
Washington: Washington has an outdoor heat exposure rule that covers temperature monitoring, water, shade and rest, acclimatization, training, and identifying and responding to heat illness. Washington has rules on outdoor heat exposure for General Industry, Agriculture, Firefighters/Fire Departments, and Wildland firefighters.