The answer to 'sewer line low water pressure' is that the most common causes are a partial blockage or break in the sewer line, or a problem with the sewer main. Symptoms of low water pressure in the sewer line include slow draining sinks and tubs, gurgling noises, and water backing up in the lowest fixtures. Solutions can range from DIY snaking or jetting the line to calling a professional plumber to diagnose and repair the issue.
If the problem is a partial blockage, you may be able to clear it yourself with a plumber's snake or high-pressure water jetter. However, if there is a more serious issue like a broken or collapsed sewer line, it will likely require professional excavation and pipe replacement. It's best to call a licensed plumber to inspect the line and determine the underlying cause.