Today I found out that portlands water has ammonia in it.

Last week I first noticed some of my fishies wernt acting so good, so i tested the water in the tank and thought i had a spike.

So I've been doing a 50% water change for the past week trying to get the ammonia down with no luck. untill today when it hit me that maybe I should check the tap, and the readings were at a .5.

So tonight I ran out and got some ammo chips and all the ammonia is finally out of my tank.

So has anyone else run into any problems cause of this?
I'v heared that portland will add ammonia to the water after an X-amount of rainy days.

Im in SW i dont know if this makes a difference.

I'm not sure about your area, but many water districts have started using chloramine in place of chlorine to disinfect water because it's more stable in solution. When you use a water conditioner during a water change, this frees up the ammonia from the chlorine ion (chloramine = chlorine + ammonia). This is usually not a problem in small water changes because your biological filter should be able to take care of it, but with large water changes, you will see an ammonia spike. If you are planning on doing large water changes, I suggest you use a water conditioner that also detoxifies the resulting ammonia (like AmQuel or Prime).