What the standard actually says
The governing rule is OSHA 29 CFR 1910.151(b):
"In the absence of an infirmary, clinic, or hospital in near proximity to the workplace which is used for the treatment of all injured employees, a person or persons shall be adequately trained to render first aid."
Read it carefully. The obligation is conditional. If emergency medical care is not in near proximity, you must have trained people on site. Everything turns on what "near proximity" means.
How OSHA interprets "near proximity"
OSHA has clarified this in interpretation letters, and it is a response-time test, not a distance test:
- Higher-risk workplaces — 3 to 4 minutes. Where serious accidents are possible (falls, suffocation, electrocution, amputation), emergency medical services must be available within 3–4 minutes if nobody on site is trained in first aid.
- Lower-risk workplaces — up to 15 minutes. In settings like offices, where serious work-related injury is less likely, a longer response time of up to 15 minutes may be reasonable.
The reasoning is medical, not bureaucratic: stopped breathing, cardiac arrest and uncontrolled bleeding have to be addressed within the first few minutes to avoid permanent impairment or death.
Applying it to a Wisconsin business
Ask three questions in order:
- What can actually go wrong here? A machine shop, warehouse, construction site or commercial kitchen carries serious-injury risk. An accounting office does not, in the same way.
- How fast does EMS actually arrive? Not the drive time — the call-to-arrival time. In parts of Madison this is short. In rural Dane County, on a second shift, in a building with gated access, it is longer than people assume.
- Does the answer to #2 beat the threshold in #1? If not, the standard requires trained people on site.
Two additional points employers miss. First, cardiac arrest does not care what industry you are in — a 55-year-old in an office collapses at the same rate as one in a plant, and the survival window is the same four to six minutes. Second, the requirement is per shift. One trained employee who works days does not cover your night crew.
Other rules that may apply to you
- Licensed child care — Wisconsin requires infant/child CPR training, and pediatric first aid is now required too. See our guide to the Wisconsin childcare rules.
- Healthcare employers — BLS is typically a condition of employment and credentialing, independent of OSHA.
- Schools, pools and fitness facilities — governed by their own state rules, licensing terms or insurer requirements.
- Your insurance carrier — may require trained responders or offer premium credit for them. Worth a phone call.
The case that does not depend on OSHA
Compliance is the floor. The practical argument is simpler: bystander CPR roughly doubles to triples survival odds in sudden cardiac arrest, and the person most likely to need it at your workplace is one of your own employees.
The cost comparison is not close either. Certifying a shift costs less than a single lost-time incident, and less than the productivity lost when an untrained team stands around waiting for an ambulance.
What "adequately trained" means in practice
OSHA does not name a provider, but the defensible standard is a course with a hands-on skills component from a recognised body — the American Heart Association being the most widely accepted. An online-only certificate with no manikin time is difficult to defend as adequate training after an incident.
Practical setup for most employers:
- At least two trained responders per shift, so one absence does not leave you uncovered
- Training that includes AED use if you have an AED on site
- A written record of who is certified and when each card expires
- Renewal every two years, staggered so the whole team does not lapse at once
Bottom line
If EMS cannot reliably reach your workplace inside 3–4 minutes and serious injury is possible there, OSHA requires trained first aid responders on site. For lower-risk offices the threshold stretches to about 15 minutes. Either way, the coverage has to hold on every shift — and cardiac arrest ignores your risk category entirely.
We bring training to your facility anywhere in Madison and Dane County. Request a group quote.
Sources: OSHA 29 CFR 1910.151; OSHA standard interpretation on "near proximity" and enforcement discretion.
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