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The simple fact is, no matter how long your sewer lines should last, you should be aware of the warning signs of a broken sewer line. Some classic examples that your sewer line needs repairs or to be replaces include: 1  Foul or strange odor in your yard. 2  As pipes age, both clay and PVC, they may become cracked or damaged.lay sewer pipes can typically last for 50 to 60 years. PVC (polyvinyl chloride) pipe was designed to last for long periods of time, typically over 100 years. After 1980 this pipe replaced the old version of clay pipes as the âgo toâ piping for sewer lines. However, both types of piping will eventually wear out.
The field is a series of trenches that may be up to 100-feet long and 1 foot to 3 feet in width, separated by six feet or more, depending on local requirements, and sometimes constructed leaving space between the original lines to install replacement leach lines when needed. - paraphrasing USDA. Septic drainfield trench length: The maximum length of a trench is typically about 150 feet but we have found installations that were three times that length. 2  Some writers opine that the maximum septic trench line is 100 feet. 3  A realistic answer is, it depends-on site and soil conditions.