It depends where you are. E.g. Ashhurst is on bore, and has a Manganese problem. I also have phosphates in my tap water.
If you are worried, Wet Pets has a filtered tap outside for clean water. A small charge per container. They say Palmy tap water is not safe, but I couldn't tell you why. The council links explain water safety for humans, but I struggled to get info on safety levels for aquariums. Aside from the manganese popping up sometimes, the water seems ok so far.