Hello all...I have a question that I have never run across before and I'd like to see what everyone thought. Many of you know that I work at PetsMart and people bring in their aquarium water to have it tested. Many people bring in water from a newly set up tank that has NO fish in it. When I test it, it has ammonia at levels of about 4.0ppm. Yes 4.0, not 0.4. I'm like, "that's weird." I thought you only get ammonia from having fish in an aquarium. So the next day, someone else brings in water to get tested, and their water tested 3.5ppm for ammonia. They said their tank had been setup for about two hours and brought in some water to make sure their pH was okay. I'm thinking somethings wrong here, water from the tap shouldn't have ammonia in it because ammonia is deadly. So I ask a co-worker of mine what's up with everyone's water having ammonia in it, especially when it's a brand new tank with 0 fish in it. He told me, "all tap water has ammonia in it. The water company puts in small amounts of ammonia to help keep the water clean." I'm like, what in the world?! I've never heard of this before. So the following day I bring in my test kit from home which works perfectly and I tested the store's water straight from the tap. What do you know, there is 3.2 ppm of ammonia STRAIGHT from the tap! Is this normal?! I'm freaking out because I have NEVER seen this before. My tap water at home doesn't have ammonia in it. By the way, the guy that I work with has been working at PetsMart for 15 years and said it's perfectly normal for tap water to have ammonia in it. Is this true? Shouldn't ammonia at that level be making us sick? Thanks so much! ~Bryson~