How do you repair a broken water pipe in the foundation?

To repair a broken water pipe in the foundation, first, turn off the main water supply to prevent further leaks. Then, access the damaged pipe by carefully excavating around it, if necessary. Clean the area and use a pipe repair clamp or epoxy putty for small leaks; for larger breaks, cut out the damaged section and replace it with a new piece of pipe, securing it with appropriate fittings. Finally, test the repair by turning the water supply back on and check for leaks before backfilling the area.