Salt Lake City has a recent record of water arriving where it shouldn't. On April 12, 2023, Emigration Creek overflowed from snow runoff and sent water through Wasatch Hollow Park and down 1700 S and 1500 E, and in the 1983 flood State Street was turned into a channel to carry runoff. Water that sits in a building is what leads to mould, and Utah's health department lists flooding, leaking pipes, leaking roofs and foundations, and condensation as moisture sources, with controlling excess moisture as the key to stopping growth. When you hire, ask whether the job touches plumbing, electrical or heating and ventilation work, because Utah requires a licensed contractor for each of those even on smaller jobs. Ask for written confirmation of public liability insurance, and workers compensation where it applies. Before work starts, check your policy too: most standard homeowners policies leave out flood damage and backed-up drains or sewers, though an endorsement may add some cover.