The pit should be at least 22 inches deep. Installation costs can vary, especially in regions that experience a lot of rainfall and humidity. Luckily, there are a few steps you can take to fix your sewage sump pump. It is then diverted away from your foundation and into the appropriate system. As well, your final price will depend on how complex the installation is. Depending on your preferences, you might opt for a DIY or for the pricier option, hire a professional to do it for you. You can pay to have a professional do the job, or you can do it yourself. Whether you're doing it on your own or hiring a professional, the process can be relatively simple. A properly installed one can be the difference between minor water damage and a major catastrophe.