Can fire water be used instead of domestic water? Is the water quality the same? What are the national or local standards for domestic water and fire water?

In cities and towns, fire water is generally taken from tap water (that is, municipal water), which is the same pipeline, so the water quality should be the same. However, the specific water intake point needs to be considered, especially the stranded fire water should not be poured back into the domestic water supply system. If it is possible to rewind, a "waterproof and backflow prevention device" must be installed. Because the pipeline system is complex, you can't judge your own situation, but one thing is clear: the country has domestic water standards, and it can't be used as domestic water if it doesn't meet them.