What can be a reason for memory loss?

i want to ask that me alongwith my family of 5 persons are suffering from a memory loss.i mean we forget small things meant to be done.it is not hereditary as my wife who is just 10 months old in our home complains for the same. We take a good diet. I have shortlisted 2 things which according to me can be harmful and is common for all of us..One is the water filter which had been installed last year... and second is our home is wifi enabled( also 6 months old ). can there be any reason out of these two ?? or something else.please guide.