The simplest way to determine if there are chloramines in your water is by reading the water test reports provided by the water authority in your local area.
They are obligated to publish test results and to disclose the level of chlorine/chloramines in your drinking water. Alternately, if you are really concerned about the safety of your water, you could have it professionally tested.
While there are consumer-level test kits for reading chloramine levels in water, they are typically unreliable.