My opinion is as follows-

1, the water discharged from tap water is black. Generally speaking, it may be caused by modifying water pipes and water tanks nearby or upstairs of the unit. The suggestions are as follows:

(1) Let off some sewage and try to see if there is clear water;

(2) Check whether the accessories have modified the construction of water pipes;

(3) Contact the water supply company by telephone;

(4) Mobile APP downloads the information query of water supply units.

2, the water quality is black, there is definitely a problem, I suggest you report the situation to the water supply company; Don't drink until the problem is clear!

The above views are for your reference.