black water in toilet

It did flush & I did call a plumber who came the next a.m. and told me it was not sewage but sediment from the water pipe, probably from a flushing of the community drain, either planned or following a water main break somewhere locally. Problem is gone, whatever it was. Thank you for your response.

If the water sits in the bathtub for a while it turns a blachish color. This doe not happen anywhere else in the house.

Have black water in toilet and washer machine not cycle pull out a lot of buggy stuff out of softener

My 27 yr old son’s dad just passed an he’s trying to get his mobile home ready to sell an when he’s flushed only 1 of 2 toilets a few time he said there is black water? What is the cause?