I live in a two story house with well water and septic tank. I've noticed that the water from my kitchen faucet sometimes smells like sewage. If I let the water run for a few minutes the smell usually goes away. I don't notice this smell at other faucets. I did notice something rather disturbing when I first discovered this problem. I had a party at the house and one of the upstairs bathrooms was supposed to be off limits. A few days later I noticed the sewage smell from the kitchen faucet. That's when I discovered that one of the guests had left a "deposit" in the upstairs toilet. It had been in there a few days. I can't be certain, but after some testing it appears that when "deposits" are left in that one toilet, it makes the kitchen water smell like sewage. The smell from the kitchen water smells like the toilet which is why I made the connection in the first place. I hope I'm wrong about this because I can't help but wonder what I've been drinking the last few weeks.
Does anyone have any ideas as to what is actually causing the kitchen faucet water to smell like sewage?