Recognizing the signs of a failing sewer line early can save you thousands of dollars in emergency repairs and property damage. The top signs include: persistent sewer odors in your yard or basement, slow drains throughout your home, frequent sewer backups, gurgling sounds from drains, patches of unusually green grass over the sewer line, foundation cracks or settling, rodent or insect infestations, mold or mildew growth, increased water bills, and visible sinkholes or depressions in your yard. If you notice multiple signs, schedule a sewer camera inspection immediately. NYC properties with sewer lines older than 50 years are at particularly high risk for failure.