OSHA's First Aid Rule Is Measured in Minutes From Each Building. Your Corporate Policy Doesn't Know How Far Any of Them Are.

A company with forty locations has a first aid policy, and it reads sensibly. Every site keeps a stocked kit. Supervisors know to call 911 for anything serious. Sites near a hospital don't need designated first aid responders, and sites that are "remote" do. The policy was written once, at head office, by someone looking at a map. Nobody has timed how long an ambulance actually takes to reach the back of the distribution center off the interstate exit, or the plant whose nearest emergency department closed two years ago, or the regional office on the fourth floor of a building with one slow freight elevator.

That timing is the whole question under OSHA's first aid standard. The answer is different at every address, and a corporate policy can't settle it from a map.

A three-paragraph standard with a site-level trigger

29 CFR 1910.151, Medical services and first aid, is one of the shortest standards in general industry. Paragraph (a) requires the employer to ensure medical personnel are readily available for advice and consultation on matters of plant health. Paragraph (b) says that in the absence of an infirmary, clinic, or hospital in near proximity to the workplace that is used to treat all injured employees, a person or persons must be adequately trained to render first aid, and adequate first aid supplies must be readily available. Paragraph (c) requires suitable facilities for quick drenching or flushing of the eyes and body, within the work area, wherever eyes or body may be exposed to injurious corrosive materials. Construction has a parallel provision at 1926.50.

Everything in paragraph (b) hangs on "near proximity to the workplace." It's written in the singular, and it describes a physical relationship between a building and a place where care is available. A company doesn't have a proximity. Each site has its own.

What OSHA means by near proximity

The standard doesn't give a number of minutes. OSHA's interpretation letters do. In a 2007 letter, OSHA restated its long-standing reading: emergency care must be available within no more than three to four minutes from the workplace. The reasoning is medical. For serious injuries such as stopped breathing, cardiac arrest, or uncontrolled bleeding, first aid has to arrive within the first few minutes to avoid permanent impairment or death. Where serious accidents involving falls, suffocation, electrocution, or amputation are possible, the letter says emergency medical services must be available within three to four minutes if no employee on site is trained to give first aid.

The same letter says OSHA uses enforcement discretion for workplaces like offices, where serious work-related injuries are less likely, and that a response time of up to 15 minutes may be reasonable there. It also points out that certain industry standards, such as logging and electric power generation, require trained first aid providers outright, with no option to rely on outside responders.

Read that as a portfolio operator and the implication is clear. There isn't one test. There are two response-time expectations tied to the hazard profile of the work, applied to a travel time that only exists at the site level. A warehouse with powered industrial trucks and dock edges sits in the three-to-four-minute category. A leasing office in the same metro area may reasonably sit in the longer one. A hospital five miles away doesn't meet three to four minutes for most sites once you count dispatch, traffic, the route to the right door, and the walk from the curb to wherever the injured person is.

Where the corporate policy and the site diverge

The most common way a multi-site first aid program breaks isn't a missing policy. It's a policy with a proximity assumption built in that nobody checked site by site. "Urban sites rely on EMS; rural sites designate responders" sounds reasonable, but it treats distance as a proxy for response time, and response time is what the interpretation measures. An urban site on a congested corridor, or a large campus where the injury happens far from any entrance, can fall outside three to four minutes as easily as a rural one.

The second break is drift. A site's proximity answer changes when the facts around it change: an urgent care clinic closes, a hospital stops taking walk-in trauma, a new shift runs overnight when local EMS coverage is thinner, the site expands onto a second building across a parking lot, or a new production line adds amputation or electrocution risk where none existed. A policy set once at head office has no mechanism to notice any of this. The site notices, maybe, when someone is hurt and help takes longer than anyone expected.

The third break is personnel. Where a site's answer is that it needs trained responders, that answer has to hold on every shift, not just on the roster. A site that designated two first aid-trained supervisors on day shift has no trained responder on nights or weekends unless someone planned for it. At the portfolio level, "site has trained responders: yes" is a very different fact from "every shift at this site has a currently certified responder present." Only the second one does what the standard is for. First aid certifications also expire on the certifying body's cycle, so a responder list that was accurate at designation quietly goes out of date.

Supplies and eyewash are site-specific too

Paragraph (b)'s "adequate first aid supplies" is also a site-level judgment. OSHA's non-mandatory appendix to 1910.151 points to the ANSI Z308.1 standard as an example of a minimally acceptable kit's contents, and it notes that larger or more hazardous workplaces may need more. A corporate purchasing contract that ships the same kit to every location fixes procurement. It doesn't answer whether a site with heavy cutting operations, or a crew working far from the main building, has what it needs within reach. OSHA has also said in interpretations that the trained responder must be able to get to the supplies quickly, not through several doorways and stairwells. That's a floor-plan question.

Paragraph (c) is even more local. Whether a site needs an eyewash or drench shower depends on which corrosive materials that site actually handles and where, and the facility has to be within the work area for immediate use. A battery charging station, a chemical dilution room, or a cleaning chemical dispensing point can each create the obligation at one site and not at the site next to it. A multi-site program that tracks eyewash stations as "installed" without tying each one to the specific corrosive exposure it serves can't tell whether a relocated process left one behind.

The bloodborne pathogens obligation that follows the designation

Designating first aid responders creates a second obligation that's easy to miss at the portfolio level. Employees designated to give first aid as part of their duties generally have occupational exposure under the bloodborne pathogens standard, 1910.1030. That brings in an exposure control plan, training, and hepatitis B vaccination provisions for those employees. A site that decides, correctly, that it needs trained responders has also taken on a bloodborne pathogens obligation for those people. If corporate tracks the first aid designation in one system and the bloodborne pathogens program in another, the two can fall out of sync one site at a time.

Making the proximity answer visible from head office

None of this argues for centralizing the decision. The facts that drive it are local, and the people at the site are best placed to observe them. What it argues for is making each site's answer explicit, documented, and reviewed, rather than inherited from a policy assumption.

In practice, that starts with a site-level determination stating which response-time expectation applies given the hazards present, what the realistic emergency response time to the actual work areas is, and how that was established. That could be a timed drill with local EMS, a documented conversation with the local fire department, or a conservative assumption where neither is available. From that follows a decision about trained responders, with shift coverage rather than headcount as the measure, and certification expiry tracked as a date rather than a checkbox. Supplies and eyewash get tied to the site's actual hazards and floor plan. And the determination gets re-opened whenever the triggers above occur: a closure nearby, a new shift, a new building, a new high-severity hazard.

At the portfolio level, the useful view isn't "every site has a first aid policy." It's which sites have a current proximity determination, which of them rely on outside EMS, and whether any of those reliance decisions sit next to hazards where OSHA's three-to-four-minute expectation applies. That list is short enough to review, and it's where a gap is most likely to be sitting unnoticed.

The standard asks a simple question about each building: if someone stops breathing here, how long until help arrives? A portfolio can only answer it by asking each building.