Ammonia in water is normally produced by animal and fish waste. The waste decomposes into ammonia and other nitrates.The presence of ammonia in water can be tested by a chemical solution available at your local fish store. If there is a dangerous level of Ammonia in water, it can be removed by a Carbon Filter, also available at your local fish store. If ammonia is consumed, it will be quiet obvious as your mouth, throat and stomach will begin to burn. If too much ammonia is consumed, then the lining of your throat and stomach will corrode, which will cause death. In the context of the problem, testing for ammonia before drinking is crucial,as it has been stated that animals graze near the water source.