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Quick Answer. A personâs normal ammonia level typically ranges between 15 to 45 micrograms per deciliter. To determine these levels, an ammonia blood test is performed.
How to Lower Ammonia Levels in a Fish Tank if They Are Not Very High. Ammonia is highly toxic to fish and other aquatic animals. The only safe level of ammonia is 0 parts per million (ppm). Even concentrations of just 2 ppm can cause fish to die in your tank. By measuring your tank's water and making the necessary adjustments, you can help lower ammonia levels back down to a safe, manageable level for your fish.