Key Takeaways
- July heat often hits hardest inside buildings that don’t have working heating, ventilation, and air conditioning yet, on roofs, and in enclosed shells. There’s still no final federal heat standard, so a site-specific plan for extreme heat days matters.
- Crews working over or near water need U.S. Coast Guard-approved life jackets, ring buoys, and a rescue boat ready, under the Occupational Safety and Health Administration’s construction rules.
- Heat raises the fire risk from fuel, gas cans, and lithium batteries left in trucks and gang boxes, and fireworks around the Fourth add to it.
- Wildfire smoke can reach jobsites far from the fire. Checking the Air Quality Index belongs in the morning huddle during smoke season.
- Stinging insects and mosquitoes peak in summer, and clean toilets, handwashing stations, and drinking water become more important as the heat climbs.
Why July Safety Topics Matter at the Peak of Summer
July is the hottest stretch of the year on most jobsites. Crews have usually adjusted to working in the heat by now, which can make it easy to miss how much the conditions around them have changed. Buildings close in and trap heat, fuel and batteries sit in the sun, and smoke from distant wildfires can drift over a site with little warning.
These July safety topics focus on the hazards that tend to peak in midsummer. They build on the heat illness basics in our June safety topics guide, and each section links to related talks from our toolbox talk library.
Heat Inside Buildings and on Extreme Heat Days
The heat basics from June still apply in July: water, rest, and shade. The difference is where the heat builds and how high it climbs. A building that’s closed in but doesn’t have working HVAC yet can trap heat for hours after the sun goes down, and the worst conditions on a site are often indoors.
Where heat tends to build
- Enclosed shells before HVAC: interior work inside a dried-in building with no air movement
- Roofs and decks: direct sun plus heat radiating up from membrane, metal, and concrete
- Mechanical rooms, shafts, and stairwells: tight spaces with little ventilation
- Hot processes: work near asphalt, welding, or curing materials
A plan for extreme heat days
- Check the heat index each morning, and set a trigger point that changes how the day runs.
- Move heavy work to the early morning when you can, and push breaks closer together as the afternoon heats up.
- Bring fans, blowers, or portable cooling into enclosed shells, and set up a cool-down area close to indoor work.
- Consider cooling gear like vests, neck wraps, and cooling towels for crews in the hottest areas.
- Pair workers so someone is always watching for early signs of heat illness.
Where the rules stand
The Occupational Safety and Health Administration published a proposed federal heat standard in August 2024. It would require a written heat plan and set two triggers based on the heat index: one at 80°F and a higher one at 90°F. The rule still hadn’t been finalized as of mid-2026, but OSHA can cite heat hazards under the General Duty Clause, which requires employers to protect workers from recognized serious hazards. California, Washington, Oregon, Colorado, Maryland, Nevada, and Minnesota already enforce their own heat rules. OSHA’s heat page tracks the latest guidance.
Additional Reading
Working Over or Near Water
Summer is peak season for bridge, marine, dock, and waterfront work, and a fall into the water brings its own set of risks. A worker can be pulled under by current, knocked unconscious on the way down, or weighed down by tools and gear. Heat adds another layer, since a worker who’s already dehydrated and worn down can run out of energy quickly in the water.
OSHA’s construction standard for working over or near water, 29 CFR 1926.106, sets the baseline wherever there’s a danger of drowning:
- Life jackets: Workers need U.S. Coast Guard-approved life jackets or buoyant work vests, and they should inspect them before and after each use.
- Ring buoys: Ring buoys with at least 90 feet of line need to be ready for use, spaced no more than 200 feet apart.
- Rescue boat: At least one lifesaving skiff needs to be immediately available.
Fall protection that keeps workers from reaching the water in the first place is the strongest control. Where that isn’t possible, make sure crews know who’s assigned to the skiff, how to throw a ring buoy, and how to call for help. Talk through what to do if someone goes in, since the instinct to jump in after a coworker can put a second person at risk.
Additional Reading
Fuel, Batteries, and Fire Risk in the Heat
High temperatures make common jobsite materials more volatile. Gasoline vapors build faster, gas cans left in the sun can vent or leak, and lithium-ion tool batteries can overheat in a truck cab or gang box. Dry grass and brush around the site can turn a stray spark into a fire that spreads quickly.
| Hazard | Why heat makes it worse | What to do |
|---|---|---|
| Gasoline and diesel | Vapors build faster and ignite more easily in high temperatures | Use approved safety cans, store fuel in the shade away from ignition sources, and shut off engines before refueling, as OSHA’s flammable liquids standard requires |
| Lithium-ion batteries | Batteries can overheat when stored in direct sun or charged while hot | Keep batteries out of truck dashboards and sun-baked gang boxes, let them cool before charging, and pull any that are swollen, damaged, or hot to the touch |
| Fireworks around July 4 | Dry vegetation and unattended sites make fires more likely | Keep fireworks off the jobsite, clear dry brush near fuel and material storage, and secure the site before the holiday |
A quick end-of-shift walk can catch most of this: fuel cans closed and stored, batteries out of the sun, and fire extinguishers charged and easy to reach.
Additional Reading
Wildfire Smoke and Air Quality
Wildfire season is near its peak in July across much of the West, and smoke doesn’t stay near the fire. Smoke from western U.S. and Canadian wildfires has reached jobsites in the Midwest and on the East Coast in recent summers. The fine particles in smoke can travel deep into the lungs, and outdoor crews doing heavy work breathe in more of them.
The Environmental Protection Agency’s Air Quality Index, posted on AirNow, is the easiest way to track conditions. It runs on a color-coded scale:
- 101 to 150 (orange): unhealthy for sensitive groups, including workers with asthma, heart conditions, or other health issues
- 151 to 200 (red): unhealthy for everyone
- 201 to 300 (purple): very unhealthy
- 301 and up (maroon): hazardous
Federal OSHA doesn’t have a wildfire smoke standard, but several Western states do. California’s rule, Title 8, Section 5141.1, kicks in when the Air Quality Index for fine particles reaches 151, and requires employers to provide N95 respirators for voluntary use. Respirators become mandatory when the index tops 500. Oregon and Washington have similar rules.
Check the Air Quality Index at the start of each shift during smoke season, wherever your projects are. When it climbs into the red, consider limiting heavy outdoor work, moving tasks indoors where the air is filtered, and offering fit-tested N95 respirators.
Additional Reading
Stinging Insects and Mosquitoes
Midsummer brings out stinging insects and mosquitoes, and construction work tends to disturb the places they live. Clearing brush, moving materials that sat for weeks, and opening up wall cavities or equipment can all put a crew face to face with a nest.
Stinging insects. Wasps, hornets, yellow jackets, bees, and fire ants are the most common. For most workers, a sting is painful but minor. For workers with an allergy, a sting can trigger anaphylaxis, a severe reaction that can close the airway within minutes. Check stacked materials, pallets, equipment, and overhangs for nests before moving them, and have a pest professional remove large nests. Workers with a known allergy should carry their prescribed epinephrine auto-injector and let their foreman know where it is.
Mosquitoes. West Nile virus is the leading cause of mosquito-borne disease in the continental United States, according to the Centers for Disease Control and Prevention. Most infected people don’t feel sick, but some develop fever and body aches, and a small number develop serious illness. Mosquitoes breed in standing water, which collects easily in buckets, tarps, tires, and low spots on a jobsite. Dump standing water regularly, and encourage crews to use insect repellent, especially at dawn and dusk.
The National Institute for Occupational Safety and Health has more guidance on protecting outdoor workers from insects.
Jobsite Sanitation and Handwashing
Clean toilets, handwashing stations, and drinking water don’t get much attention until they’re missing, and summer heat makes all three matter more. Crews drink more water, portable toilets get hotter and dirtier faster, and germs spread more easily when people eat lunch on site without a place to wash up. World Hepatitis Day falls on July 28, a good reminder that hepatitis A spreads through contaminated hands, food, and water.
OSHA’s sanitation standard for construction, 29 CFR 1926.51, requires potable drinking water, washing facilities, and a minimum number of toilets based on crew size:
| Number of workers | Minimum toilet facilities |
|---|---|
| 20 or fewer | 1 toilet |
| 20 or more | 1 toilet seat and 1 urinal per 40 workers |
| 200 or more | 1 toilet seat and 1 urinal per 50 workers |
Meeting the minimum is a start. A few habits keep facilities usable as the site grows:
- Service toilets more often in the heat, and add units when the crew count climbs.
- Put handwashing stations near toilets and eating areas, and keep them stocked with soap, water, and paper towels.
- Keep drinking water cool, clean, and close to the work, with single-use cups or refill stations.
- Provide clean, private facilities for everyone on the crew, including lockable units for women.
Remind crews to wash their hands before eating, drinking, or smoking, especially after handling chemicals, cement, or lead-containing materials.
Strengthen Your July Safety Program
Midsummer hazards tend to change day by day with the heat index, the air quality, and the work moving indoors. Keeping up depends on plans that reflect today’s conditions and an easy way for crews to flag problems as they come up.
Here’s what that looks like in practice, using Safety Mojo as an example:
- Catching plans that ignore the heat. Flex PTP is Safety Mojo’s digital Pre-Task Plan tool. It scores the quality of submitted PTPs and permit requests, so a safety manager can see which ones need a closer look. A PTP for roof work on a 95-degree afternoon that doesn’t mention water, breaks, or cooling might score lower, flagging it before the crew goes up. If someone gets sick from the heat, that record can also show oversight was in place.
- Flagging problems from the field. Conversational Forms lets a foreman or superintendent fill out observations and near-miss reports by voice. A foreman can report a worker who felt dizzy in an enclosed shell, an empty handwashing station, or a nest in a stack of pallets on the spot.
- Answering questions about the day’s conditions. Ask Mojo is a voice-activated assistant that searches a project’s own safety documents in English or Spanish. A foreman can check the project’s heat plan or smoke procedures from the work area when conditions change.
If you’re planning for the hottest weeks of the year and want to see how this works on your projects, book a demo.
Frequently Asked Questions
What are the most important July safety topics for construction? Key July topics for construction crews include heat inside buildings and on extreme heat days, working over or near water, fuel and battery fire risk, wildfire smoke, stinging insects and mosquitoes, and jobsite sanitation.
Is there a federal OSHA heat standard? Not yet. OSHA proposed a federal heat standard in August 2024, but it hadn’t been finalized as of mid-2026. OSHA can still cite heat hazards under the General Duty Clause, and several states, including California, Washington, and Oregon, enforce their own heat rules.
What does OSHA require for construction work over water? Where there’s a danger of drowning, OSHA requires U.S. Coast Guard-approved life jackets or buoyant work vests, ring buoys with at least 90 feet of line spaced no more than 200 feet apart, and at least one lifesaving skiff immediately available.
When is wildfire smoke unhealthy for outdoor work? An Air Quality Index of 151 or higher is considered unhealthy for everyone, and readings from 101 to 150 are unhealthy for sensitive groups. California’s wildfire smoke rule requires employers to take action when the index for fine particles reaches 151.
How many toilets does a construction site need? OSHA requires at least one toilet for 20 or fewer workers, one toilet seat and one urinal per 40 workers for 20 or more, and one toilet seat and one urinal per 50 workers for 200 or more.
How can crews reduce fire risk from fuel and batteries in the heat? Store fuel in approved safety cans in the shade, shut off engines before refueling, keep lithium-ion batteries out of direct sun, let batteries cool before charging, and pull any that are swollen or damaged out of service.
