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In the UAE, what matters is not a personal plumbing licence but the company behind the technician. A legitimate plumbing outfit holds an economic licence from the emirate's licensing authority — the Department of Economy and Tourism in Dubai, ADDED in Abu Dhabi, the economic development departments elsewhere — with an activity such as plumbing and sanitary installation or building maintenance listed on it. The person in your bathroom should be a sponsored employee of that company, and when work goes wrong — a joint fails inside a wall three weeks later, a heater connection drips into the flat below — your recourse runs through that company, its licence and its insurance.

A freelancer moonlighting from an unrelated job has no licence, no insurance and, practically speaking, no address. If his joint floods the apartment beneath yours, the claim lands on you as the person who hired him. The gap between a licensed company and an unlicensed handyman on a mixer swap might be AED 50–150; the gap when a concealed connection fails is a collapsed gypsum ceiling, warped wardrobes and a five-figure bill in dirhams. Compliance is the cheapest insurance you will ever buy.

UAE tap water is desalinated and remineralised, and in most city networks only moderately hard. But it arrives warm much of the year, sits in storage tanks, and passes through heaters running at 50–60 degrees — ideal conditions for calcium carbonate to drop out of solution. The result is the white crust on every shower head in the country, mixer cartridges that seize years early, and heater elements wearing a mineral jacket that makes them work harder and die sooner. Where groundwater historically blended into supply — parts of Al Ain and the northern emirates — scale builds noticeably faster.

Scale is a safety issue, not just a nuisance. A scaled heater stresses its thermostat and pressure relief valve, the two components standing between a routine appliance and a tank of superheated water in your ceiling. Scaled isolation valves seize open, which you discover only during an emergency when you cannot shut the water off. The countermeasures are unglamorous: descale shower heads and aerators yourself, have the heater flushed and its element and anode checked every year or two, and replace seized valves before they matter. Whole-home softeners make sense for high-consumption villas; for apartments, disciplined heater and valve maintenance captures most of the benefit.

Almost every UAE building stores water in rooftop or ground-level tanks, and utilities such as DEWA, ADDC and SEWA are responsible for quality only up to your meter — everything after that, including the tank, is the owner's responsibility. In summer, a poorly sealed tank at 45 degrees ambient is an incubator, which is why municipalities publish tank cleaning guidance and why Dubai Municipality registers the companies allowed to do the work commercially. A sensible rhythm for a villa is a professional clean and disinfection every six to twelve months; in an apartment building, the owners association should hold the certificates and produce them on request.

Tank hygiene and plumbing intersect constantly: sediment from a neglected tank is what blocks mixer cartridges, jams float valves and accelerates scale in heaters. If your cold water runs cloudy after a windy week, or you are booking a plumber for a third gritty-aerator complaint, mention the pattern in the booking notes — a good technician will recognise tank sediment as the root cause and tell you to escalate to the building rather than sell you another mixer.