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Recently, our water from the artesian well started to smell (again). It only smells bad for only few seconds than the smell disappear. We have sulfur-iron removal system, water softener, UV lamp. Only the water from the system I listed above smell, because we also have a Reverse Osmosis installed in the kitchen and the water filtered from it does NOT smell.

We did a hydrocarbon test that was negative. We also did a normal "drinkable water" analysis and it passed with nothing ususual. My question is what are the possibilities of that smell?

PS. I can confirm the smell is not sulfur (different from rotten egg)
See this post for our water results before installing the system if it may be useful

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    $\begingroup$ I suspect the UV lamp is creating small amounts of ozone. It is an unstable, highly reactive strong oxidant, which is used in low concentrations for some water purification procedures as it readily destroys organic matter (such as bacteria). The strong-smelling gas can readily be produced from oxygen by turning on a high intensity UV lamp in air. You should always let rest for a couple of minutes after being collected from an ozonizer, to let the residual ozone escape. Once the smell disappears, it should be okay to drink. $\endgroup$ – Nicolau Saker Neto Dec 6 '13 at 11:22
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As mentioned in the comments, water is often treated by ozonation in order to sterilize it and ensure it can be drank with no ill effects. Ozone is a very reactive gaseous allotrope of oxygen, produced in situ by exposure of atmospheric oxygen to UV-B light (in fact this happens naturally in the stratosphere, generating a thin ozone blanket covering the world). Ozone can be produced artificially by using a mercury lamp, which emits large amounts of UV light. The water is then brought into contact with the ozone in order to be purified.

When water is collected after being ozonated, typically a small amount of ozone is still dissolved in the water. If the water is allowed to rest for a few minutes after being collected, the residual dissolved ozone diffuses out. Ozone has a very strong, characteristically sharp odour, which can be detected even at very low concentrations. This is likely why the asker's water had an odd smell. Ozone is toxic, though, so exposure should be avoided.

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