That is a "cave in"...you have pulled water out of a softer piece of the world and not from a rocky place. The surrounding "rooftop" of your water hole has caved in a bit...We are seeing too many "sink holes" everywhere around the world from broken water pipes, too much oil or water being pumped out of a certain area and such...maybe you will get lucky and the dirty, muddy water will come out and the caved in area will not cave in any further and your water will clear up again....praying for your well...GaryWhat does it mean when your well water turns muddy?