Eyewash station requirements start with one sentence of federal law: where a worker’s eyes may be exposed to injurious corrosive materials, OSHA requires suitable facilities for quick flushing within the work area for immediate emergency use. Everything else people quote, the 15 minutes, the 10 seconds, the 0.4 gallons per minute, comes from ANSI/ISEA Z358.1, the consensus standard OSHA points employers to. On a well site or a pipe yard the hard part is meeting those numbers without a water line.
Full-body drench showers have their own section of the standard and aren’t covered here.
What OSHA actually requires for eyewash stations
The rule is 29 CFR 1910.151(c) for general industry. Construction work carries the same sentence at 29 CFR 1926.50(g). Neither one gives a flow rate, a distance or a water temperature.
OSHA has filled the gap with interpretation letters. In a 2002 letter the agency said ANSI Z358.1 was never adopted as an OSHA standard, but that OSHA “has often referred employers” to it as guidance. The same letter said a citation for missing or unsuitable flushing facilities is written under 1910.151(c), not the General Duty Clause. It also put water temperature on the employer: it’s your job to check that the unit gives suitable protection against the chemicals your people handle.
A 2009 letter settled two questions that come up on location all the time:
- Irritants alone don’t trigger the federal rule. If nothing in the work area is an injurious corrosive per its safety data sheet, 1910.151(c) doesn’t require an eyewash. ANSI’s definition of “hazardous material” is broader, and the letter notes that.
- Sealed containers don’t count as exposure until someone opens them. Corrosives in containers that won’t be opened don’t trigger the rule. But where a tap or spigot is used to sample or draw off the contents, OSHA said an eyewash “certainly” is needed where that task happens.
A tote of acid strapped on a trailer is one thing. The same tote with a hand drawing a sample off the valve is a different job, and the eyewash has to be there for it.
Where an eyewash is needed on a well site or yard
Acid is the obvious trigger. FracFocus, the national chemical disclosure registry, lists acid as a standard fracturing additive used to dissolve minerals and start cracks in the rock. Acid gets delivered, staged, transferred and sampled on location before it’s ever blended.
Batteries are the one people forget. Under 29 CFR 1910.178(g)(2), any area where forklift or industrial truck batteries are charged must have facilities for flushing and neutralizing spilled electrolyte. A pipe yard or shop with a charging station needs that eyewash whether or not anything corrosive is ever pumped there.
Walk the job with the safety data sheets in hand. ISEA, the trade group that writes Z358.1, says the standard doesn’t tell you which equipment a given hazard needs. That decision comes from a job hazard analysis and the SDS. Mark every place a corrosive is opened, poured, pumped, sampled or mixed. Each of those is a point the 10-second walk starts from.
ANSI Z358.1 eyewash requirements at a glance
These are the eyewash provisions of ANSI/ISEA Z358.1-2014, the edition ISEA’s own selection guide still works from, as summarized by ISEA and a manufacturer’s compliance checklist that cites the section numbers.
| Requirement | Eyewash | Eye/face wash |
|---|---|---|
| Minimum flow | 0.4 gpm (1.5 L/min) | 3.0 gpm (11.4 L/min) |
| Duration | 15 minutes | 15 minutes |
| Fluid needed for one full flush | 6 gallons | 45 gallons |
| Temperature | Tepid, 60 to 100°F (16 to 38°C) | Same |
| Valve | Hands-free, stays open, on in 1 second or less | Same |
| Flow pattern height | 33 to 53 in. from the floor, 6 in. from the wall or nearest obstruction | Same |
| Location | Reachable in 10 seconds (about 55 ft), same level as the hazard, clear path | Same |
| Marking | Highly visible sign, well-lit area | Same |
| Testing | Plumbed units activated weekly; every unit inspected annually | Same |
The gallons row is just the flow rate times 15 minutes, and it’s the row that matters most on a site with no plumbing. Six gallons is the minimum for one person flushing both eyes once. The unit also has to rinse both eyes at the same time, at a flow high enough that the user can hold their eyes open, with the nozzles covered against dust and the covers pushed off by the water.
When the work involves strong acids or caustics, the manufacturer checklist says the eyewash should sit right next to the hazard, with a professional consulted on distance. The 10-second figure is the ceiling.
Plumbed, self-contained or a bottle on the truck?
Most well sites have no potable water line, so plumbed units are out except at shops and yards. That leaves two kinds of equipment, and only one of them meets the standard.
Self-contained units carry their own flushing fluid. ISEA says the reservoir is either potable water mixed with a preservative or sealed pre-mixed cartridges, and that in most cases it has a limited life and must be changed as the manufacturer says. The standard requires visual checks of self-contained units on the manufacturer’s schedule to see if the fluid needs changing or topping off. A self-contained eyewash that meets 0.4 gpm for 15 minutes counts as a primary unit.
Personal wash units, the squeeze bottles in the truck or on the wall, don’t. ISEA calls them supplementary devices that “do not meet all of the” standard’s requirements, such as the 15-minute flush and flushing both eyes together. ISEA lists them for the first rinse while someone gets to the primary unit, and for the trip to medical care afterward. A case of bottles in the doghouse doesn’t count as the location’s eyewash.
Temperature on a Permian location
Tepid means 60 to 100°F. ISEA’s reasoning is simple: water that’s too hot can speed a chemical reaction and hurt the eye, and water that’s too cold makes people quit before 15 minutes are up. The flushing only works if the person stays in it.
West Texas pushes both ends. NOAA’s 1991-2020 climate normals for Midland International Airport put the average July high at 95.8°F and the average January low at 32.7°F. A self-contained unit parked in full sun on a caliche pad sits in that heat all afternoon. The same unit on a January morning can be under 60°F or frozen.
ISEA’s hazard assessment asks this directly: will the station be outdoors and exposed to freezing or extreme heat? On location that means:
- Shade the unit in summer and check the fluid temperature with a thermometer during the hot part of the day, not at the morning walk-around.
- In winter, use a heated jacket or blanket made for the unit. ISEA lists heated blankets as the freeze protection for self-contained eyewashes.
- Write the temperature on the weekly check, so a unit that drifts out of range gets caught.
Weekly checks and annual inspection
For plumbed units the standard calls for weekly activation, long enough to verify operation and confirm fluid reaches the heads. ISEA says the point is to flush out sediment and microbes that grow in standing water. Self-contained units follow the manufacturer’s inspection and fluid-change schedule instead. Every unit, of either type, gets an annual inspection against the standard, including whether changes in the area have blocked the path or moved the hazard.
A weekly eyewash check on location takes two minutes:
- Path from each hazard point is clear and on the same level, no hoses, pallets or a parked truck in the way
- Sign visible from the work, area lit for night work
- Dust covers in place and come off when the unit is activated
- Valve opens in one motion and stays open hands-free
- Both streams rise evenly; fluid clear, with no smell or debris
- Self-contained: fluid or cartridge inside its expiry date, level full, temperature checked
- Date, initials and any fault written on the tag
How to use an eyewash station
Get to it within seconds. Push the valve open and put both eyes into the streams. Hold your eyes open; the flow is set so you can, and the reflex is to clamp them shut. Keep flushing for the full 15 minutes, then get medical attention and take the product’s safety data sheet with you.
The person who isn’t hurt has a job too. Start a timer, keep the injured worker in the stream when they want to stop, and call for help, because someone with their eyes full of water can’t watch the clock.
Showers when the exposure isn’t only the eyes
An eyewash covers a splash to the face. When a hose parts or a tank overflows and the chemical soaks a worker’s clothes and skin, the eyewash is not enough. That calls for a full drench shower under 1910.151(c) as well. Site Safe Solutions rents emergency shower trailers for oilfield locations in the Permian Basin and West Texas, delivered and rigged up on location and maintained during the rental. If your job hazard analysis shows full-body exposure on a frac, acid or chemical job, tell us the location, what’s being handled and how long you need the unit. Related reading: the first hour of a spill and IBC tote containment.
