When the law asks for one
OSHA 29 CFR 1910.151(c) is short: where the eyes or body of any person may be exposed to injurious corrosive materials, suitable facilities for quick drenching or flushing of the eyes and body must be provided within the work area for immediate emergency use. The rule names no standard, no flow and no time.
Those numbers come from ANSI/ISEA Z358.1. OSHA has said in writing that it never adopted Z358.1 as a mandatory standard, but that it often refers employers to it as a recognized source of guidance, and ISEA notes that many states require Z358.1 compliant equipment.
The four numbers that matter
ISEA summarizes the 2014 edition of the standard this way, and an OSHA letter from 2020 repeats the flow figure:
| What | Figure | Why it matters |
|---|---|---|
| Flush time | 15 minutes | The standard follows medical opinion that a 15-minute flush gives emergency first aid mitigation. |
| Flow | At least 1.5 liters a minute (0.4 gpm) | Fifteen minutes at that flow is more than 22 liters, far more than any bottle holds. |
| Time to reach | No more than 10 seconds | About 55 feet for most able-bodied people, on the same level as the hazard, with a clear path. |
| Water temperature | 60 to 100 °F (16 to 38 °C) | Tepid water lets a person keep their eyes in the stream for the full 15 minutes. |
The standard also asks that a valve open in 1 second or less and stay open until someone closes it on purpose, so both hands are free to hold the eyelids open.
Where bottles fit, and where they fall short
A personal eyewash bottle is fast and fits on a belt or a wall, but it cannot run for 15 minutes. OSHA wrote in 2020 that portable bottles are insufficient on their own and that workers need access to an eyewash facility able to flush for the recommended 15 minutes. A bottle buys the seconds it takes to walk to the station; it does not replace the station.
A gravity-fed portable station holds its own water and needs no plumbing, which is why it is the usual answer on a job site, in a garage bay or anywhere a plumbed unit cannot go. Read its capacity against the flow figure above before you place it.
The weekly check
ISEA states that plumbed devices must be tested weekly, long enough to verify operation and to make sure flushing fluid is available. A self-contained station is checked the way its manual says: the water or the additive inside has a service life, and the dust cover and the nozzles have to be in place when someone needs them in a hurry.
The stations, drench units and replacement parts named here have their own pages in the Sellstrom catalog.
