ISO E015 Drinking water Sign

A Positive Marker for Potable Water

E015 depicts a tap filling a glass, rendered white on green, and declares the water at that point safe to drink. Unusually for the emergency family, its subject is welfare rather than injury response, yet the classification earns its keep: knowing which water is potable becomes acutely important in heat, during long shifts, and in any incident where mains supply is disrupted. On sites with multiple water systems, the sign converts a guess into a fact.

Its mirror image is the prohibition sign P005, not drinking water, which crosses out the same tap-and-glass motif in red. The two signs are designed to be read as a pair: process water, reclaimed water, firefighting mains, and untreated borehole outlets carry P005, while verified potable points carry E015. The pairing only works if it is applied consistently — an unmarked tap on a site that labels some outlets invites exactly the wrong inference.

Why Segregation Is a Legal Matter

Workplace sanitation rules across jurisdictions require employers to provide potable drinking water and to prevent confusion with non-potable systems. In the United States, OSHA's sanitation standard obliges employers to supply potable water and to post non-potable outlets so employees do not drink from them; comparable welfare regulations in the UK, EU member states, and elsewhere impose the same twin duty of provision and distinction. E015 is the standard positive half of demonstrating compliance, especially on industrial sites where pipework carries several grades of water.

The stakes are higher than taste. Non-potable systems can carry chemical treatment residues, legionella, or cross-connections to process fluids, and construction or agricultural sites often run temporary lines whose provenance nobody remembers by mid-project. Marking confirmed potable points, and only those points, means the labeling regime keeps protecting people even as the site plumbing evolves.

Placement in Practice

Post E015 at every intended drinking point: fountains, break room taps, water coolers fed from the mains, filling stations for personal bottles, and tanker or bowser outlets on construction sites and at outdoor events. In hot-work environments and heat stress programs, signage doubles as a nudge — hydration stations that are visibly marked get used more, and supervisors can direct crews to them by sign rather than by description.

Two disciplines keep the sign trustworthy. First, verify before posting: temporary supplies, long dead-legs, and tanks need testing or flushing regimes, and a green sign on unverified water is worse than none. Second, re-survey when plumbing changes. A renovation that reroutes a marked tap onto a non-potable riser silently falsifies the sign, so water point labeling belongs on the checklist for any pipework modification.

What does the green drinking water sign mean?

E015 indicates that the water at the marked outlet is potable — verified safe for drinking. It uses the green safe-condition format and shows a tap filling a glass. Its opposite is P005, the red prohibition sign with the same motif crossed out, which marks non-potable outlets.

Is it a legal requirement to label drinking water taps?

Most workplace sanitation rules require potable water to be provided and non-potable outlets to be clearly identified so no one drinks from them; OSHA's sanitation standard in the US takes this approach. The strict legal emphasis usually falls on marking the unsafe outlets, but on any site with mixed systems, positively marking the safe points with E015 is how the distinction stays usable.

Should I use E015 or P005 on a water outlet?

Use E015 only on outlets confirmed to deliver potable water, and P005 on every outlet that does not — process water, rainwater harvesting, firefighting mains, untreated wells. On sites carrying both systems, label both directions consistently; leaving some taps unmarked undermines the scheme because people assume unlabeled means fine.

Do temporary water supplies on construction sites need the drinking water sign?

Yes, and they benefit from it most. Temporary bowsers, tanks, and hose runs are exactly where potable and non-potable lines get confused, so mark verified drinking points with E015, keep the supply on a testing and flushing regime, and re-check the labeling every time the temporary plumbing is rearranged.