Does UV water purification cause cancer? [closed]








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I found out that a relative is using a machine that performs UV water purification at home (for drinking). 


There seems to be a distinct difference from the water that is not purified by it.


Is it possible that this use of UV radiation may lead to cancer in humans?





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> Is it possible that this use of UV radiation may lead to cancer in humans?
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> 
> 


No!


The lamps used for water treatment are usually *low pressure mercury vapour lamps*. These lamps emit in the UV-C range with a maximum at $\lambda = 254~\mathrm{nm}$.


* No mercury can escape from an intact lamp.
* In principle, UV-C radiation may cause severe sun burns and harm your eyes. However, the lamps are housed and **the consumer is protected from the direct exposure to radiation**.
* There is no change to the water due to UV irradiation.
* UV-C radiation is efficient in killing microorganisms in water.


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