Emergency eyewash, safety shower, and combination units shall comply with the requirements of ANSI Z358.1.
The eyewash should have a plumbed drain to the sanitary sewer connection. When a sewer connection cannot be provided, a means shall be provided to empty test water into a bucket that can hold at least 10 gallons.
The 10-gallon capacity criterion comes from flowing water for 15 minutes at a flow rate of 0.4 gallons per minute. Eyewash fountains shall be plumbed with a drain to promote the flushing of the eyewash, decrease the buildup of microbial contamination, and reduce the risks associated with a wet floor. All drains should have an appropriate trap to prevent sewer gases from entering the building.
8 CCR 5162(e)
Eyewash and safety shower water should be delivered at a tepid temperature. For indoor systems, typical cold water supply temperature is considered satisfactory. If the heating of hot water is required to provide tepid water, then a mixing valve to blend hot and cold water shall be provided.
Outdoor plumbing needs to be protected from the sun and freezing. The requirement to deliver tepid water means that faucet-mounted eyewashes are not acceptable, because the water will emerge at the temperature of the tap water, which could range from ice cold to scalding hot. Tanks holding tepid water shall be avoided because of the risk of Legionella proliferation.
ANSI Z358.1 Appendix B6
The water supply to safety showers and combination units shall be controlled by a ball-type shutoff valve that is visible, well marked, and accessible to shower testing personnel in the event of leaking or failed shower head valves. The valve should not be located where an unauthorized person could easily shut it off.
The area around the safety shower should be painted a bright color and should be well lighted. Whenever possible, the floor immediately beneath the eyewash and emergency shower, and to a radius of 30 inches, should be constructed of a nonslip surface and be a distinctive pattern and color to facilitate promoting a clear path of access.