OSHA Requirements for Job Site Trailers
Federal regulations that affect every construction site and general industry workplace. Each regulation is explained in plain English with the Stahla equipment that helps you comply.
Disclaimer: This information is provided for reference only and does not constitute legal advice. OSHA standards are subject to revision. Always verify current requirements at osha.gov or consult a qualified safety professional.
Potable Drinking Water
What This Means for You
Every construction site must provide clean drinking water, free of charge, to all workers. Water must be dispensed from covered containers with a tap or single-use cups — no shared drinking vessels. Containers must be clearly marked "DRINKING WATER" and refilled as needed throughout the shift.
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Toilet Facilities at Construction Sites
What This Means for You
Construction sites must provide toilet facilities based on worker count: 1 toilet for up to 20 workers, 1 per 15 workers for crews of 21-200, and 1 per 20 workers above 200. Separate facilities are required for each sex unless single-occupancy units with locking doors are used. Toilets must be maintained in a sanitary condition.
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Washing Facilities
What This Means for You
Handwashing stations must be available within 200 feet of the work area. They must provide running water (potable or adequately treated), soap, and single-use towels or air dryers. When workers are exposed to harmful substances, washing facilities adequate for emergency use must be in the immediate work area.
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Sanitation (General Industry)
What This Means for You
For non-construction workplaces (offices, warehouses, manufacturing), employers must provide toilet rooms with at least one toilet per 15 employees of each sex, potable water, handwashing facilities with hot and cold running water, and proper waste receptacles. This standard applies to office trailers used as permanent or semi-permanent workplaces.
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Wiring Methods for Temporary Power
What This Means for You
Temporary electrical wiring on construction sites must use approved cable types, be protected from damage, and include ground-fault circuit interrupter (GFCI) protection on all 120-volt, 15- and 20-ampere outlets. Generators powering office trailers must be properly grounded and cables must be rated for the load. Extension cords cannot substitute for permanent wiring when trailers are occupied long-term.
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Flammable Liquids — Storage and Handling
What This Means for You
Fuel stored on job sites must meet specific containment requirements. Above-ground fuel tanks require secondary containment (a berm or dike) capable of holding 110% of the largest tank volume. Fuel storage areas must be at least 20 feet from buildings, have fire extinguishers within 25 feet, and display "No Smoking" signage. Spill kits must be readily accessible.
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Quick Reference: OSHA Toilet Ratios
| Workers on Site | Minimum Toilets | OSHA Ratio |
|---|---|---|
| 1 – 20 | 1 | 1 per 20 workers |
| 21 – 200 | 1 per 15 workers | Round up |
| 200+ | 1 per 20 workers | Round up |
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