Is this amount of arsenic in bottled water dangerous to our health?

[jameswinston0]

I know... Bottled water is bad, its polluting the earth. I know. But I liked to stop at the store next to my gym and buy a gallon of water. Its super convenient, cheap and gets me to drink more water. The gallons are only 1 dollar. I recycle the bottles. I literally bring all my recyclables to the center every 2 weeks. Anyway back to the topic. There have been a few brands of water lately that Consumer Reports has said contained arsenic. I know that aresenic is a naturally occurring substance in the earth and is kind of ubiquitous. It's pretty much in everything. Although the amounts vary and are usually not harmful. But I am not well educated on the subject. Here are the numbers

 

PPM= Parts Per Million

Crysyal Geyser(the one I drink)- Contained 0.004 PPM

Volvic- Contained 0.004 PPM

Starkey Spring Water- 0.008 PPM

 

Now these are 3 popular brands of water. Volvic more so in Europe and the UK and Starkey is an expensive spring water sold in glass bottles at Whole Foods. But Crystal Geyser is cheap , sold in big gallon jugs and is all over the United States. Now I don't know much about these amounts. How much is something like 0.004 parts per million? Is that something to be concerned with when consuming it on the regular? Looking at my cities tap water quality report and the arsenic level is much higher. I do drink filtered tap water. I know its better than bottled for the environment. So please don't judge me for drinking bottled water. I am just genuinely wondering about those numbers and hoping someone educated in the subject can help me

Those waters I posted. Are those numbers something to be worried about?

[MigL]

The current WHO guidelines for Arsenic ingestion is 10 micrograms/litre.
You are certainly under that with 4 parts per billion.

Arsenic is a carcinogen, so I would think there is no safe limit, just the amount of risk you are willing to live with.
You might find water with no Arsenic, but is that just an indication of the bottler's measurable limits ?