I just had an experience with a double ended real-estate deal in Courtenay BC for a house. I was the buyer. I did my due diligence and discovered that there was arsenic in the well water above the maximum allowed limit.

The realtor (yes my realtor who also was the seller's realtor) not once said to me that arsenic in the well water is an issue. In fact she tried to convince me it was not an issues by saying the seller has been drinking the water for 20 years and said she had no problems with the water.

I ended up killing the deal. And I fired the realtor. In the process I talked to the realtor's managing broker. He said that he knew about this particular house and did talk to the realtor about the water issue. He said arsenic in the water was a big issue and it could possible have a negative impact the neighbourhood in terms of the prices of the properties and that someone should inform the neighbours about checking their well water for arsenic.

Be careful!